This slide tries to address status of Postharvest diseases of different vegetables, fruits, cereals and legumes, their symptoms, losses and
integrated management .
The disease which develops on harvested parts of the plants like seeds, fruits and also in vegetables are called post-harvest disease. It leads to measurable qualitative and quantitative food loss along the supply chain, starting at the time of harvest till its consumption or other end uses. In Nepal, different studies have shown the postharvest losses of fruits and vegetables are 20-50% (Gautam and Bhattarai, 2012) and 6-12% losses in worldwide.
The document discusses factors that affect plant disease epidemics. It describes the disease triangle of host, pathogen, and environment interacting to cause disease. It further expands the triangle to the disease tetrahedron with the addition of time and human factors. Key factors discussed for each element include the susceptibility and genetics of host plants, the virulence and life cycle of pathogens, and the role of temperature, humidity and other environmental conditions in supporting pathogen survival and spread. The concepts of epidemiology, plant disease forecasting, and remote sensing in detecting and monitoring diseases are also summarized.
This document discusses crop management practices for rainfed farming. It begins by defining rainfed areas as those with arid, semi-arid, or sub-humid climates prone to drought. Improved practices for rainfed crops involve selecting short-duration, drought-resistant varieties and maximizing cropping intensity through mixed/intercropping. Key practices include fertilizer use, tillage, forage crops, agroforestry, weed management, and making mid-season corrections if drought occurs. The overall goal is to utilize more of the available rainwater and improve historically low and unstable yields for farmers in rainfed regions.
This document discusses the survival and spread of plant pathogens. It explains that pathogens can cause disease under favorable conditions by coming into contact with a host. Pathogens have different structures that serve as inoculum to infect hosts, such as spores, hyphae, and individuals for viruses and bacteria. Pathogens can survive through specialized resting structures, as saprophytes, in association with living plants, nematodes, insects, agricultural materials, and surface water. They spread through autonomous dispersal by soil and seeds during farming, or passive dispersal through animate agents like insects, fungi, nematodes, humans, animals, birds, and phanerogamic parasites, and inanimate agents like wind and water. Understanding dispersal methods
The document discusses the e-Agriculture Community of Practice, an international initiative led by the UN Food and Agriculture Organization. The community aims to promote global cooperation on the use of information and communication technologies (ICT) to support agricultural and rural development. It has over 7,000 members from over 150 countries who share resources virtually and through in-person events. Key topics discussed by the community include the role of mobile telephony and public-private partnerships in rural development.
The document discusses different types of interactions that can occur between crops grown in close proximity in cropping systems:
1. Competitive interactions occur when one crop uses limiting resources like water, nutrients, or light at the expense of the other crop.
2. Complementary interactions occur when one crop helps supply resources to the other crop, such as nitrogen fixation by legumes.
3. Allelopathic interactions can occur when one crop releases chemical toxins that inhibit the growth of the other crop. Successful intercropping requires minimizing competitive interactions and maximizing complementary effects between crop species.
plant drought effects, mechanisms and managementG Mahesh
This presentation provides an overview of plant drought stress, including its effects, mechanisms, and management strategies. Drought stress can impact plant growth, yield, water relations, photosynthesis, nutrient uptake, and cause oxidative damage. Plants have developed morphological, physiological and molecular mechanisms to tolerate drought, such as escaping dry conditions, reducing water loss through stomatal control, antioxidant production, and accumulating compatible solutes. The presentation also discusses strategies to manage drought, including improving crop genotypes and optimizing agronomic practices to enhance drought resistance.
The document discusses soil solarization and sterilization. It provides details on:
1) Soil solarization is a process where soil is covered with plastic film and heated by sunlight, killing pathogens and weeds. It is a safe alternative to toxic soil fumigants.
2) For effective soil solarization, the soil must be loose and debris-free before covering with a clear, UV-stabilized plastic tarp for 4-6 weeks during hot sunny periods.
3) Sterilization describes destroying all microbial life through physical or chemical methods like heat, radiation, filtration, or chemicals. Heat sterilization is the most common method and can use dry or moist heat depending on the
The document discusses factors that affect plant disease epidemics. It describes the disease triangle of host, pathogen, and environment interacting to cause disease. It further expands the triangle to the disease tetrahedron with the addition of time and human factors. Key factors discussed for each element include the susceptibility and genetics of host plants, the virulence and life cycle of pathogens, and the role of temperature, humidity and other environmental conditions in supporting pathogen survival and spread. The concepts of epidemiology, plant disease forecasting, and remote sensing in detecting and monitoring diseases are also summarized.
This document discusses crop management practices for rainfed farming. It begins by defining rainfed areas as those with arid, semi-arid, or sub-humid climates prone to drought. Improved practices for rainfed crops involve selecting short-duration, drought-resistant varieties and maximizing cropping intensity through mixed/intercropping. Key practices include fertilizer use, tillage, forage crops, agroforestry, weed management, and making mid-season corrections if drought occurs. The overall goal is to utilize more of the available rainwater and improve historically low and unstable yields for farmers in rainfed regions.
This document discusses the survival and spread of plant pathogens. It explains that pathogens can cause disease under favorable conditions by coming into contact with a host. Pathogens have different structures that serve as inoculum to infect hosts, such as spores, hyphae, and individuals for viruses and bacteria. Pathogens can survive through specialized resting structures, as saprophytes, in association with living plants, nematodes, insects, agricultural materials, and surface water. They spread through autonomous dispersal by soil and seeds during farming, or passive dispersal through animate agents like insects, fungi, nematodes, humans, animals, birds, and phanerogamic parasites, and inanimate agents like wind and water. Understanding dispersal methods
The document discusses the e-Agriculture Community of Practice, an international initiative led by the UN Food and Agriculture Organization. The community aims to promote global cooperation on the use of information and communication technologies (ICT) to support agricultural and rural development. It has over 7,000 members from over 150 countries who share resources virtually and through in-person events. Key topics discussed by the community include the role of mobile telephony and public-private partnerships in rural development.
The document discusses different types of interactions that can occur between crops grown in close proximity in cropping systems:
1. Competitive interactions occur when one crop uses limiting resources like water, nutrients, or light at the expense of the other crop.
2. Complementary interactions occur when one crop helps supply resources to the other crop, such as nitrogen fixation by legumes.
3. Allelopathic interactions can occur when one crop releases chemical toxins that inhibit the growth of the other crop. Successful intercropping requires minimizing competitive interactions and maximizing complementary effects between crop species.
plant drought effects, mechanisms and managementG Mahesh
This presentation provides an overview of plant drought stress, including its effects, mechanisms, and management strategies. Drought stress can impact plant growth, yield, water relations, photosynthesis, nutrient uptake, and cause oxidative damage. Plants have developed morphological, physiological and molecular mechanisms to tolerate drought, such as escaping dry conditions, reducing water loss through stomatal control, antioxidant production, and accumulating compatible solutes. The presentation also discusses strategies to manage drought, including improving crop genotypes and optimizing agronomic practices to enhance drought resistance.
The document discusses soil solarization and sterilization. It provides details on:
1) Soil solarization is a process where soil is covered with plastic film and heated by sunlight, killing pathogens and weeds. It is a safe alternative to toxic soil fumigants.
2) For effective soil solarization, the soil must be loose and debris-free before covering with a clear, UV-stabilized plastic tarp for 4-6 weeks during hot sunny periods.
3) Sterilization describes destroying all microbial life through physical or chemical methods like heat, radiation, filtration, or chemicals. Heat sterilization is the most common method and can use dry or moist heat depending on the
This topic gives the wide range in understanding the advances for managing the abiotic stress that occurs in the pulse crops like pigeonpea,mungbean,chickpea etc.
Bioherbicides are biologically based agents for controlling weeds. They provide an environmentally friendly alternative to chemical herbicides which can pollute the environment and affect human health. The first commercial bioherbicides appeared in the 1980s. They included Devine, a mycoherbicide that controls the weed Morrenia odorata through a pathogenic fungus. Since then, many microbes have been screened for their ability to act as bioherbicides. While bioherbicides show promise, challenges remain in developing agents that are effective, host-specific, and genetically stable under field conditions. Improved formulation and targeting of specific weed species could help increase their use in agriculture as an alternative to chemical herbicides
The document discusses two types of plant disease resistance: vertical and horizontal. Vertical resistance is conferred by single genes and results in complete but specific resistance. Horizontal resistance is conferred by multiple genes and results in partial but non-specific resistance. The document also notes that disease is usually specific to a pathogen while resistance tends to be less specific. It provides pros and cons of each type of resistance and current strategies that use horizontal resistance.
This document summarizes three major diseases that affect gram (chickpea) crops: wilt, grey mould, and ascochyta blight. It describes the symptoms, causal pathogens, and disease cycles. For wilt, the symptoms include yellowing, wilting, and death of plants. It is caused by Fusarium oxysporum and spreads through soil and irrigation water. For grey mould, symptoms include flower and pod rotting. It is caused by Botrytis cineria and spreads rapidly under humid conditions. For ascochyta blight, symptoms include leaf spots and stem lesions. It is caused by Ascochyta rabiei and spreads through infected plant debris and
Pear is the temperate fruit grown mainly in temperate regions or in regions of higher altitudes.
Here, Pest infesting pear fruits and its management stratergies are dealt here
This document provides information on several diseases that affect citrus plants:
1. Citrus gumosis is caused by the oomycete Phytophthora citrophthora and leads to gummosis, bark cracking, and tree death. Prolonged water contact and wet soils promote spread.
2. Citrus scab, caused by Elsinoe fawcetti, forms wart-like lesions on leaves, twigs, and fruit, reducing fruit quality. It spreads via airborne conidia and prefers humid conditions.
3. Citrus canker, caused by Xanthomonas axonopodis pv. citri, forms small yellow spots on leaves, twigs, and
Introduction importance scope and objectives of plant pathologyAnurAg Kerketta
This document provides an introduction to the field of plant pathology by defining it as the study of plant diseases, their causes, and management. It discusses how plant pathology relates to other sciences and its key objectives, which include studying the etiology, pathogenesis, epidemiology, and control of plant diseases. The document emphasizes the importance of plant pathology, noting that diseases cause billions in annual crop losses worldwide. It provides examples of historical famines and epidemics caused by plant diseases. Finally, it outlines the broad scope of plant pathology in surveying, identifying, assessing, and developing management strategies for economically important plant diseases.
The document discusses biocontrol and biostimulants for pest management. It notes the problems with excessive pesticide use including impacts to human health, development of pest resistance, and resurgence of pest populations. It then discusses biological control using beneficial organisms to suppress pests and pathogens. Specific examples of using Trichoderma and Pseudomonas species to control various rice, potato, and muskmelon diseases are provided. The document also discusses the use of insect growth regulators, plant-derived biorational pesticides, pheromones, and new technologies like SPLAT for applying pheromones to manipulate insect behavior for pest management.
This document provides information on diseases that affect guava plants. It discusses the symptoms, characteristics, and management of major diseases like Fusarium wilt caused by the fungus Fusarium oxysporum f. sp. psidii. It also covers other diseases such as fruit canker caused by Pestalotiopsis psidii, stem canker from Physalospora psidii, anthracnose from Gloeosporium psidii, and red rust from Cephaleuros virescens. It details the identification and environmental conditions that promote each disease, as well as cultural, biological and chemical control methods.
Conservation agriculture useful for meeting future food demands and also contributing to sustainable agriculture.
Conservation agriculture helps to minimizing the negative environmental effect and equally important to increased income to help the livelihood of those employed in agril. Production.
Introduction of conservation technologies (CT) was an important break through for sustaining productivity, It seeks to conserve, improve and make more efficient use of natural resources through integrated management of soil, water, crops and other biological resources in combination with selected external inputs.
The document discusses the Vertifolia effect and boom-bust cycle in plant breeding. The Vertifolia effect refers to the loss of horizontal resistance that occurs during breeding for vertical resistance in the presence of fungicides/insecticides. An example is the loss of horizontal resistance to potato blight after the discovery of fungicides. The boom-bust cycle describes how a resistant cultivar with a single resistance gene is widely adopted by farmers, but then virulent pathogens spread and break the resistance, leading farmers to abandon the cultivar. Maintaining horizontal resistance and incorporating resistance genes later in breeding can help reduce these effects.
The document discusses several diseases that affect papaya plants and fruit, including fungal, viral, and post-harvest diseases. It describes the symptoms, causal organisms, and management strategies for major diseases like powdery mildew, anthracnose, mosaic virus, ring spot virus, and post-harvest rots caused by Macrophomina, Rhizopus, and Phomopsis fungi. Proper cultivation practices, fungicide applications, vector control, and post-harvest handling can help control these diseases and reduce losses to papaya production and storage.
Important of green manuring and their effect on soil fertilityJigar Joshi
This document discusses the importance of green manuring and its effects on soil fertility. It provides details on different types of green manuring including in-situ and ex-situ methods. Tables from various studies show that green manuring improves soil properties like organic matter and nutrient content, and increases crop yields. The conclusion is that green manuring is an effective low-cost technique for improving soil health and fertility while also reducing the need for chemical fertilizers.
This document provides an introduction to crop simulation models. It defines a model as a set of mathematical equations that mimic the behavior of a real crop system. Modeling involves analyzing complex problems to make predictions about outcomes. Simulation is the process of building models and analyzing systems. Crop models provide simple representations of crops. The document outlines different types of models and their purposes. It describes the key components and steps involved in building crop simulation models, including defining goals and variables, quantifying relationships, calibration, and validation. Finally, it discusses several popular crop models and their uses in farm management, research, and experimental applications.
Nitrogen use efficiency is often low for crops, ranging from 30-50% due to nitrogen losses through mechanisms like ammonia volatilization, nitrate leaching, and denitrification. Methods to improve nitrogen use efficiency include proper fertilizer, soil, and crop management practices as well as modifying fertilizers. Slow release fertilizers, urease inhibitors, and nitrification inhibitors can be used to coat or add chemicals to fertilizers to reduce nitrogen losses and allow for more efficient nitrogen uptake by crops.
Micropropagation and commercial exploitation in horticulture cropsDheeraj Sharma
Micro-propagation – principles and concepts, commercial exploitation in horticultural crops. Techniques - in vitro clonal propagation, direct organogenesis, embryogenesis, micrografting, meristem culture. Hardening, packing and transport of micro-propagules.
The simultaneous or sequential application of herbicides with other agrochemicals like insecticides, fungicides, and fertilizers can result in interactions that influence the efficacy and toxicity of the applied chemicals. These interactions may be additive, synergistic, antagonistic, or have no effect. Factors like chemical properties, mode of action, application method, and environmental conditions determine the type and extent of interactions. While some interactions like synergism can enhance weed control, others like antagonism can reduce efficacy or increase toxicity. Understanding these interactions is important for optimizing agrochemical combinations and avoiding adverse effects.
FATE OF HERBICIDE IN SOIL by Pravir pandeyPravir Pandey
The document summarizes the fate of herbicides in soil after application. It discusses various processes that affect herbicide activity including degradation through biological, chemical and photodecomposition, as well as transfer processes like adsorption, leaching, volatility and runoff. Factors that influence these processes include environmental conditions, soil properties, herbicide formulations and application methods. The degradation of herbicides renders them inactive while transfer processes may remove herbicides from the application site.
This document discusses plant diseases, their importance, causes, and principles of disease control. It notes that plant diseases have impacted humanity throughout history, causing famines. While diseases are natural, annual crop losses of 30-50% are common in developing countries. Major disease factors include temperature, humidity, soil properties, and nutrients. Control methods center on exclusion, eradication, protection, and improving host resistance/immunity. The key is that a mother's prayers are the best protection, so we shouldn't hurt our mothers with our words.
This topic gives the wide range in understanding the advances for managing the abiotic stress that occurs in the pulse crops like pigeonpea,mungbean,chickpea etc.
Bioherbicides are biologically based agents for controlling weeds. They provide an environmentally friendly alternative to chemical herbicides which can pollute the environment and affect human health. The first commercial bioherbicides appeared in the 1980s. They included Devine, a mycoherbicide that controls the weed Morrenia odorata through a pathogenic fungus. Since then, many microbes have been screened for their ability to act as bioherbicides. While bioherbicides show promise, challenges remain in developing agents that are effective, host-specific, and genetically stable under field conditions. Improved formulation and targeting of specific weed species could help increase their use in agriculture as an alternative to chemical herbicides
The document discusses two types of plant disease resistance: vertical and horizontal. Vertical resistance is conferred by single genes and results in complete but specific resistance. Horizontal resistance is conferred by multiple genes and results in partial but non-specific resistance. The document also notes that disease is usually specific to a pathogen while resistance tends to be less specific. It provides pros and cons of each type of resistance and current strategies that use horizontal resistance.
This document summarizes three major diseases that affect gram (chickpea) crops: wilt, grey mould, and ascochyta blight. It describes the symptoms, causal pathogens, and disease cycles. For wilt, the symptoms include yellowing, wilting, and death of plants. It is caused by Fusarium oxysporum and spreads through soil and irrigation water. For grey mould, symptoms include flower and pod rotting. It is caused by Botrytis cineria and spreads rapidly under humid conditions. For ascochyta blight, symptoms include leaf spots and stem lesions. It is caused by Ascochyta rabiei and spreads through infected plant debris and
Pear is the temperate fruit grown mainly in temperate regions or in regions of higher altitudes.
Here, Pest infesting pear fruits and its management stratergies are dealt here
This document provides information on several diseases that affect citrus plants:
1. Citrus gumosis is caused by the oomycete Phytophthora citrophthora and leads to gummosis, bark cracking, and tree death. Prolonged water contact and wet soils promote spread.
2. Citrus scab, caused by Elsinoe fawcetti, forms wart-like lesions on leaves, twigs, and fruit, reducing fruit quality. It spreads via airborne conidia and prefers humid conditions.
3. Citrus canker, caused by Xanthomonas axonopodis pv. citri, forms small yellow spots on leaves, twigs, and
Introduction importance scope and objectives of plant pathologyAnurAg Kerketta
This document provides an introduction to the field of plant pathology by defining it as the study of plant diseases, their causes, and management. It discusses how plant pathology relates to other sciences and its key objectives, which include studying the etiology, pathogenesis, epidemiology, and control of plant diseases. The document emphasizes the importance of plant pathology, noting that diseases cause billions in annual crop losses worldwide. It provides examples of historical famines and epidemics caused by plant diseases. Finally, it outlines the broad scope of plant pathology in surveying, identifying, assessing, and developing management strategies for economically important plant diseases.
The document discusses biocontrol and biostimulants for pest management. It notes the problems with excessive pesticide use including impacts to human health, development of pest resistance, and resurgence of pest populations. It then discusses biological control using beneficial organisms to suppress pests and pathogens. Specific examples of using Trichoderma and Pseudomonas species to control various rice, potato, and muskmelon diseases are provided. The document also discusses the use of insect growth regulators, plant-derived biorational pesticides, pheromones, and new technologies like SPLAT for applying pheromones to manipulate insect behavior for pest management.
This document provides information on diseases that affect guava plants. It discusses the symptoms, characteristics, and management of major diseases like Fusarium wilt caused by the fungus Fusarium oxysporum f. sp. psidii. It also covers other diseases such as fruit canker caused by Pestalotiopsis psidii, stem canker from Physalospora psidii, anthracnose from Gloeosporium psidii, and red rust from Cephaleuros virescens. It details the identification and environmental conditions that promote each disease, as well as cultural, biological and chemical control methods.
Conservation agriculture useful for meeting future food demands and also contributing to sustainable agriculture.
Conservation agriculture helps to minimizing the negative environmental effect and equally important to increased income to help the livelihood of those employed in agril. Production.
Introduction of conservation technologies (CT) was an important break through for sustaining productivity, It seeks to conserve, improve and make more efficient use of natural resources through integrated management of soil, water, crops and other biological resources in combination with selected external inputs.
The document discusses the Vertifolia effect and boom-bust cycle in plant breeding. The Vertifolia effect refers to the loss of horizontal resistance that occurs during breeding for vertical resistance in the presence of fungicides/insecticides. An example is the loss of horizontal resistance to potato blight after the discovery of fungicides. The boom-bust cycle describes how a resistant cultivar with a single resistance gene is widely adopted by farmers, but then virulent pathogens spread and break the resistance, leading farmers to abandon the cultivar. Maintaining horizontal resistance and incorporating resistance genes later in breeding can help reduce these effects.
The document discusses several diseases that affect papaya plants and fruit, including fungal, viral, and post-harvest diseases. It describes the symptoms, causal organisms, and management strategies for major diseases like powdery mildew, anthracnose, mosaic virus, ring spot virus, and post-harvest rots caused by Macrophomina, Rhizopus, and Phomopsis fungi. Proper cultivation practices, fungicide applications, vector control, and post-harvest handling can help control these diseases and reduce losses to papaya production and storage.
Important of green manuring and their effect on soil fertilityJigar Joshi
This document discusses the importance of green manuring and its effects on soil fertility. It provides details on different types of green manuring including in-situ and ex-situ methods. Tables from various studies show that green manuring improves soil properties like organic matter and nutrient content, and increases crop yields. The conclusion is that green manuring is an effective low-cost technique for improving soil health and fertility while also reducing the need for chemical fertilizers.
This document provides an introduction to crop simulation models. It defines a model as a set of mathematical equations that mimic the behavior of a real crop system. Modeling involves analyzing complex problems to make predictions about outcomes. Simulation is the process of building models and analyzing systems. Crop models provide simple representations of crops. The document outlines different types of models and their purposes. It describes the key components and steps involved in building crop simulation models, including defining goals and variables, quantifying relationships, calibration, and validation. Finally, it discusses several popular crop models and their uses in farm management, research, and experimental applications.
Nitrogen use efficiency is often low for crops, ranging from 30-50% due to nitrogen losses through mechanisms like ammonia volatilization, nitrate leaching, and denitrification. Methods to improve nitrogen use efficiency include proper fertilizer, soil, and crop management practices as well as modifying fertilizers. Slow release fertilizers, urease inhibitors, and nitrification inhibitors can be used to coat or add chemicals to fertilizers to reduce nitrogen losses and allow for more efficient nitrogen uptake by crops.
Micropropagation and commercial exploitation in horticulture cropsDheeraj Sharma
Micro-propagation – principles and concepts, commercial exploitation in horticultural crops. Techniques - in vitro clonal propagation, direct organogenesis, embryogenesis, micrografting, meristem culture. Hardening, packing and transport of micro-propagules.
The simultaneous or sequential application of herbicides with other agrochemicals like insecticides, fungicides, and fertilizers can result in interactions that influence the efficacy and toxicity of the applied chemicals. These interactions may be additive, synergistic, antagonistic, or have no effect. Factors like chemical properties, mode of action, application method, and environmental conditions determine the type and extent of interactions. While some interactions like synergism can enhance weed control, others like antagonism can reduce efficacy or increase toxicity. Understanding these interactions is important for optimizing agrochemical combinations and avoiding adverse effects.
FATE OF HERBICIDE IN SOIL by Pravir pandeyPravir Pandey
The document summarizes the fate of herbicides in soil after application. It discusses various processes that affect herbicide activity including degradation through biological, chemical and photodecomposition, as well as transfer processes like adsorption, leaching, volatility and runoff. Factors that influence these processes include environmental conditions, soil properties, herbicide formulations and application methods. The degradation of herbicides renders them inactive while transfer processes may remove herbicides from the application site.
This document discusses plant diseases, their importance, causes, and principles of disease control. It notes that plant diseases have impacted humanity throughout history, causing famines. While diseases are natural, annual crop losses of 30-50% are common in developing countries. Major disease factors include temperature, humidity, soil properties, and nutrients. Control methods center on exclusion, eradication, protection, and improving host resistance/immunity. The key is that a mother's prayers are the best protection, so we shouldn't hurt our mothers with our words.
This document discusses plant diseases, their importance, causes, and principles of disease control. It notes that plant diseases have impacted humanity throughout history, causing famines from crop losses of 30-50% in some areas. Environmental factors like temperature, humidity, soil properties, and nutrients can influence disease development. Control methods aim to exclude, eradicate, or protect against pathogens using practices like sanitation, crop rotation, and regulating the environment, along with developing host resistance. The key message is that prayer and respecting one's mother are more protective than any security.
1) The document discusses various microbes that can contaminate vegetables at different stages, from planting to consumption. It identifies bacteria (e.g. Erwinia, Pseudomonas, Salmonella), fungi (e.g. Botrytis, Penicillium), and yeasts that can cause spoilage or pose health risks.
2) Conditions like improper refrigeration, transportation, and packaging are outlined as factors that can enable microbial growth. Specific spoilage symptoms caused by different microbes are also described, such as soft rotting and discoloration.
3) The document recommends safety practices like temperature control, sanitation, protecting fields, and staff training to minimize microbial contamination of vegetables from farm to
MANAGEMENT OF SOIL BORNE PATHOGENS OF VEGETABLE CROPS UNDER PROTECTED CULTIVA...Mayur Thesiya
MANAGEMENT OF SOIL BORNE PATHOGENS OF VEGETABLE CROPS UNDER PROTECTED CULTIVATION
Soilborne pathogens and nematodes are very destructive in vegetables crops and one of the most limiting factors to farmers income. Soil fumigation has been an essential component of greenhouses crops since the 1960s. Growing vegetables without soil fumigants has remained a challenge, in part because commercially acceptable eggplant cultivars produced through conventional breeding lack resistance to many soil borne plant pathogens. Grafting cultivars with high quality and productivity on rootstocks that are resistant to soil pests and diseases is a method known for years ago, but which was improved and quickly spread in the last years. The objective of the researches was to evaluate the performance of the eggplant grafting on the some rootstocks in greenhouse conditions, alone and in combination with soil fumigation using metham sodium. Data obtained in the combinations scion/rootstock and not grafted eggplants were compared with data recorded where the metham sodium fumigant was used and as well as with the combinations grafted eggplants planted in soil disinfested with metham sodium. The marketable yield, fruits quality, frequency and root galling index of soilborne disease and nematodes, in the experimental variants were determined and calculated. Grafting process combined with the metham sodium soil disinfestation led to significant reduction in the incidence of attack produced by soilborne disease (Fusarium oxysporum f. sp. melongenae, Verticillium dahlia) and nematodes (Meloidogine incognita).
This document discusses plant pathology, which is the scientific study of plant diseases caused by pathogens and environmental conditions. It addresses the causes of plant diseases, including living organisms like fungi, bacteria, viruses and nematodes, as well as non-living factors. The disease cycle and factors affecting disease development are also examined. Plant diseases can cause significant economic losses by reducing crop yields and quality. Understanding plant pathology is important for preventing diseases and maintaining food supply.
Post-Harvest Pathology and Physiological disorders in fruits completed .pptxJoseph Messam Jr.
this PowerPoint will explore post harvest pathology, you will see common types of pathogenic species that affects fruit and vegetables. secondly the PowerPoint will explore physiological disorders along with the different types of physiological disorders
Plant pathology is the study of diseases that affect plants. It examines the microorganisms and environmental factors that cause plant diseases, as well as methods for preventing and controlling diseases. Plant pathogens include viruses, bacteria, fungi, nematodes, and other microbes that infect plants and cause damage. A key goal of plant pathology is minimizing crop losses from diseases, which globally account for 36.5% of annual losses. Understanding plant diseases and their causes is crucial for improving global food security.
This document discusses the early history of plant pathology and the role of fungi in plant diseases. It describes how ancient texts like the Rig Veda and Vraksha Ayurveda showed early understanding of plant diseases and their microbial causes. Throughout history, plant diseases were often attributed to supernatural causes. However, in the 17th-18th centuries, scientists like Anton van Leeuwenhoek and Pier Antonio Micheli began careful microscopic study of fungi and their role in plant diseases. This laid the foundations for the modern science of plant pathology.
1. Post-harvest losses of horticultural crops in India are estimated between 5.8-18.1% for fruits and 6.9-13% for vegetables due to lack of cold storage, inefficient supply chains, and inaccessibility for small farmers.
2. Biological factors like respiration and ethylene production as well as environmental factors like temperature and humidity influence the deterioration of fruits and vegetables after harvest.
3. Maturity at harvest, harvest method, and post-harvest handling and storage conditions impact the quality and shelf life of horticultural crops. Proper harvest practices and cold storage can help reduce post-harvest losses.
General account of post harvest diseases of vegetablesvaishalidandge3
1. Losses due to postharvest diseases can occur at any point from harvest to consumption and diseased produce poses health risks. 2. Common postharvest diseases infect through wounds from mechanical, insect or physiological injuries and are caused by fungi like Penicillium, Botrytis, Colletotrichum, and Rhizopus. 3. Integrated control methods include fungicides, temperature control, hygiene, packaging, and preventing injuries to limit infection sites.
Plant diseases have impacted humanity throughout history by reducing crop yields and sometimes causing famines. Major outbreaks include the Irish potato famine of 1845-1860. Environmental factors like temperature, humidity, and soil properties influence disease development. Symptoms vary but include wilting, discoloration, and rotting. Effective disease control relies on exclusion, eradication of the pathogen, and protection of the plant through cultural practices and chemicals.
Biological control of the post harvest diseases of fruits.Dinithi De Silva
what is post harvest disease. Simply , Postharvest diseases are those that appear and develop after harvest. Here theses are some pictures of post harvest diseases.
Fig 01- cherry fruit rot caused by Alternaria sp.
Fig 02- mango stem end rots causative agent is Dotheiorella sp.
All postharvest diseases of fruit are caused by fungi and bacteria.
viral infections present before harvest can sometimes develop more rapidly after harvest. In general, however, viruses are not an important cause of postharvest disease. Postharvest diseases are often classified according to how infection is initiated. The so-called 'quiescent' or 'latent' infections are those where the pathogen initiates infection of the host at some point in time , but then enters a period of inactivity or dormancy until the physiological status of the host tissue changes in such a way that infection can proceed.
After The dramatic physiological changes like compositional changes physiological changes which occur during fruit ripening are often the trigger for reactivation of latent infections. It can be through direct penetration through skin, natural openings & injuries . injuries can be mechanical or caused by insects. Therefore, post harvest diseases can be arised during or after harvest.After harvest in the dramatically physiological changes like compositional changes physiological changes which occur during the fruit ripening of in triger for reactivation of the latent infection.
And also many of the physiological changes also triggers the reactivation of the latent infection mainly both the losses conditions can lead to the fungal infection because fungi are optimum at the dry conditions after that ethylene production fruit ripening cannot so it causes a lot of compositional changes in the sugar content and physiological changes in the fruit it soften the fruit covering and then it can be easily the damage so through the damage microorganisms can enter the fruits and grow inside and multiplication then causes postharvest diseases
This document discusses biological control of post-harvest diseases of fruits. It begins by defining post-harvest diseases and outlining some common examples like anthracnose, gray molds, and sour rots. Factors that influence post-harvest diseases are then examined, followed by their impacts. Management strategies are explored, with biological control highlighted as an environmentally friendly option. The mechanisms and ideal characteristics of biocontrol agents are summarized. Examples of commercial products are given along with methods of application both pre- and post-harvest. Advantages include being natural and cost-effective, while disadvantages include being host-specific and requiring initial investment.
Alternative means of disease control 30 mins 16x9 (johns desktop's conflicted...Dr John Dempsey
This document discusses methods for reducing turfgrass disease through alternative means to fungicides. It summarizes a presentation on traditional and alternative ways to reduce disease incidence, including nutrient inputs, defence activators like phosphite and Civitas, and cultural controls like rolling, topdressing and mowing heights. It also examines the infection processes of common cool season pathogens like Anthracnose and Microdochium patch and how environmental and plant factors contribute to disease levels.
This study was carried out to isolate and identify pathogenic microorganisms associated with
deterioration of tomato fruits. Fruit samples of infected and non-infected tomatoes were collected from
two open markets, Oja-Oba and Sabo in Osogbo, Nigeria. Each of the tomato was cut and the liquid
content inoculated on nutrient agar and potato dextrose agar, incubated at 37 0C and 25 0C, respectively,
and observed from 24 hours to 5 days, after which different colonies obtained were identified using slide
culture technique. Two bacteria, Staphylococcus aureus and Bacillus spp, as well as two fungi Aspergillus
flavus and Rhizopus stolonifer were observed in the tomato samples in both markets. Prevalence indices
revealed that isolated pathogens is higher at Sabo market than Oja-Oba market. Pathogenicity tests also
revealed that both of bacteria and fungi caused fruit decay. Consumers’ awareness on potential health
hazards of consuming relatively cheaper and pathogen contaminated spoilt fruits should be intensified.
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A review of the growth of the Israel Genealogy Research Association Database Collection for the last 12 months. Our collection is now passed the 3 million mark and still growing. See which archives have contributed the most. See the different types of records we have, and which years have had records added. You can also see what we have for the future.
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it describes the bony anatomy including the femoral head , acetabulum, labrum . also discusses the capsule , ligaments . muscle that act on the hip joint and the range of motion are outlined. factors affecting hip joint stability and weight transmission through the joint are summarized.
1. The presentation on post harvest disease of fruits,
vegetables, cereals, legumes and their management
Sarad Pokhrel
MSc.Ag Plant Pathology
Agriculture and Forestry University
2. Postharvest Disease
The disease which develops on harvested parts of the plants like seeds,
fruits and also in vegetables are called post-harvest disease.
It leads to measurable qualitative and quantitative food loss along the
supply chain, starting at the time of harvest till its consumption or other
end uses.
.In Nepal, different studies have shown the postharvest losses of fruits and
vegetables are 20-50% (Gautam and Bhattarai, 2012) and 6-12% losses in
worldwide.
3. How grains, ripen fruits and vegetables become subject
to attacks of various microorganisms upon harvesting??
Disease resistance weakens as a result of separation from the parent plant.
Harvested fruits and vegetables are rich in moisture and nutrients, which suit the
development of pathogens.
Upon ripening the fruits and vegetables often become more susceptible to injury.
series of physiological processes occurs during prolonged storage which leads to
the senescence of tissues and, in parallel increased susceptibility to weak
pathogens.
4. Factors affecting disease development
A. Pre-harvest factors, harvesting and handling
Cultivar
Planting materials
Environmental conditions
Cultural practice
Harvesting
5. Factors affecting disease development
B. Inoculum level
C. Storage conditions
Temperature
Relative humidity and moisture
Storage atmosphere
6. Some major post-harvest disease of Cereals
A. Ear and kernel molds of corn
1. Aspergillus species (A. flavus, A.
parasiticus, etc.; Capable of producing an
aflatoxin which is toxic to livestock and
human.
7. Some major post-harvest disease of Cereals
A. Ear and kernel molds of corn
2. Fusarium spp.: white to pink mold;
Fumonisin toxin, which is toxic to
livestock (particularly horses), can be
produced
8. Some major post-harvest disease of Cereals
A. Ear and kernel molds of corn
3. Gibberella zeae (bright pink and red to
white), Potential mycotoxins include
vomitoxin or deoxynivalenol (DON) and
zearalenone(ZE), which are deadly to
livestock.
9. Some major post-harvest disease of Cereals
A. Ear and kernel molds of corn
4. Penicillium spp : Powdery blue-green
mold
.
10. Some major post-harvest disease of Cereals
A. Ear and kernel molds of corn
5. Cladosporium herbarum
6. Stenocarpella maydis(Diplodia): White to gray mold
7. Nigrospora sphaerica, synonym N. oryzae (ear or cob rot)
.
11. Some major post-harvest disease of Cereals
B. kernel molds of wheat
1. Penicillium
verrucosum primarily
produced Ochratoxin,
2. Fusarium
graminearum produced
DON and ZE
3. Aspergillus spp
12. Some major post-harvest disease of Cereals
C. Aspergillus, Penicillium, and Fusarium genera are responsible for production of
most important mycotoxins often occur in rice, which includes:
Aflatoxins
Citrinin
DON
Sterigmatocystin
Patulin, etc.
13. Some major post-harvest disease of Fruits
and Vegetables
1. Fruit rot, dark spot, sooty mold
Primary host: Stone and pome fruits,
grapes, papaya, tomato, pepper,
eggplant cucumber, melon,
watermelon, squash, cabbage,
cauliflower, broccoli, corn, pea, bean.
carrot, potato, sweet potato, onion
Pathogen: Alternaria alternata (Fr.)
Keissler
14. Some major post-harvest disease of Fruits
and Vegetables
2. Gray mold disease
Primary host: strawberry, raspberry, cherry, grape, pome and stone
fruits, persimmon, citrus fruits, tomato, pepper, eggplant, cucumber,
squash, melon, pumpkin, artichoke, cabbage, cauliflower, lettuce, broccoli,
pea, bean, carrot, onion, potato, sweet potato
Pathogen : Botrytis cinerea Pers. ex Fr. Perfect state: Botryotinia
fuckeliana (de Bary) Whetzel
15.
16. Some major post-harvest disease of Fruits
and Vegetables
3. Anthracnose
Primary host: Avocado, mango, papaya,
guava, citrus fruits, Pome and stone
fruits(Bitter rot), Banana(crown rot)
Pathogen: Colletotrichum gloeosporioides
(Penz.) Sacc. Perfect state: Glomerella
cingulata (Stonem.) Spauld & V. Schrenk,
Colletotrichum gloeosporioides ,
Colletotrichum musae
17. Some major post-harvest disease of Fruits
and Vegetables
3. Dry or soft rot
Primary host: tomato, pepper,
eggplant, melon, squash,
pumpkin, watermelon,
cabbage, celery, artichoke,
asparagus, corn, carrot, potato,
sweet potato, onion, garlic
Pathogen: Fusarium spp.
18. Some major post-harvest disease of Fruits
and Vegetables
4. Green mold/Blue mold
Primary host: citrus fruits ( green
mold exclusively), Tomato,
cucumber, melon , pome fruits
mainly, but also stone fruits(Blue
mold)
Pathogen: Penicillium digitatum
Sacc, Penicillium expansum (Link)
Thom
19. Some major post-harvest disease of Fruits
and Vegetables
5.Watery soft rot:
Primary host: Stone and pome fruits.
grape, avocado, papaya, strawberry,
raspberry, cherry, tomato, pepper,
eggplant, carrot, melon, pumpkin,
squash, pea, bean, sweet potato
Pathogen: Rhizopus stolonifer (Ehr. ex
Fr.) Lind
21. Some major post-harvest disease of Fruits
and Vegetables
7. Watery white rot, cottony rot
Primary host: Citrus fruits, cabbage,
cauliflower, lettuce. celery, broccoli,
artichoke, pea, bean, carrot, eggplant,
melon, cucumber, pumpkin, squash,
onion, garlic
Pathogen: Sclerotinia sclerotiorum (Lib.)
de Bary
22. Some major post-harvest disease of Fruits
and Vegetables
8. Brown rot citrus caused by Phytophthora citrophthora (Smith & Smith)
Leon.
9. stem-end and fruit rot, green-yellow mold of citrus caused by
Trichoderma viride Pers. ex S.F. Gray
10. Brown rot of stone fruits mainly, but also pome fruits caused by
Monilinia fructicola (Wint.) Honey
11. stem-end rot, dry black rot of papaya caused by Phoma caricae-papayae
(Tarr) Punith. And so on.
23.
24. 1.Management of post harvest disease of
fruits and vegetables
A. Maintaining the host resistance
Treatments and conditions that lead to delayed ripening and senescence
Indirectly suppress postharvest disease development.
Includes include low-temperature storage, low-O2 and high-C02
atmospheres, ethylene removal from the atmosphere, growth regulators,
calcium application
25. 1.Management of post harvest disease of
fruits and vegetables
A. Maintaining the host resistance
1. Cold storage:
Storage at low temperature is the main method for reducing deterioration of
harvested fruits and vegetables
inhibition of ripening and senescence of the host and extension of the period
during which it maintains its resistance to disease.
inhibition of pathogen development by subjecting it to a temperature unfavorable
for its growth.
26. 1.Management of post harvest disease of
fruits and vegetables
A. Maintaining the host resistance
2. Modified and controlled atmosphere
'CA storage' generally implies precise control of O2 and CO2
concentrations in the atmosphere,
MA storage' is broader and may indicate any synthetic atmosphere, arising
intentionally or unintentionally, in which the composition of its constituent
gases cannot be closely controlled.
27. 1.Management of post harvest disease of
fruits and vegetables
A. Maintaining the host resistance
2. Modified and controlled atmosphere
controlled atmosphere i.e. low O2 levels or high CO2 levels suppress various
stages of the pathogen growth, and its enzymatic activity.
Maintains the resistance of the host to infection by keeping it in a superior
physiological condition
In order to obtain appreciable reduction of spore germination, mycelial growth
and sporulation in many fungal species, O2 concentrations of less than 1% are
required
28. 1.Management of post harvest disease of
fruits and vegetables
A. Maintaining the host resistance
3. Growth regulators
Suppress decay development indirectly, by retarding ripening and senescence
processes in fruits and vegetables
It may be of special importance mainly for fruits and vegetables that cannot be
stored at low temperatures because of their cold sensitivity
Applying the synthetic auxin 2,4-dichlorophenoxy acetic acid (2,4-D) to citrus
fruits prior to storage , resulting in considerable reduction of stem-end rot.
29. 1.Management of post harvest disease of
fruits and vegetables
A. Maintaining the host resistance
4. Calcium Application
Calcium contributes to preserve the structural integrity and functionality of
membranes and the cell wall during fruit ripening and senescence
Calcium treatment may reduce storage disorders, such as bitter pit and internal
breakdown in apples
It was thus found that pre-harvest calcium sprays reduced the rate of storage
losses caused by Gloeosporium spp. in apples, or Botrytis and Geotrichum rots in
stored grapes (Miceli et al., 1999)
30. 1.Management of post harvest disease of
fruits and vegetables
B. Physical Methods
1. Heat Treatments
It may be applied by means of hot water dips and sprays, hot vapor or dry air, or infrared
or microwave radiation
It can be Short-term heating 40°C (generally 44-55°C) for a short time
Long-term heat treatments usually (38-46°C), for a longer duration (12 h to 14 h)
For example, postharvest decay of strawberries caused by Botrytis cinerea and Rhizopus
stolonifer was controlled by exposure of the fruit to humid air at 44°C for 40-60 min.
31. 1.Management of post harvest disease of
fruits and vegetables
B. Physical Methods
2. Ionizing radiation:
may directly harm the genetic material of the living cell, leading to mutagenesis
and eventually to cell death
Due to deep penetration ability, it irradiates microorganisms in wounds, and also
quiescent or active infections.
Presence of oxygen and water content of the cell are major factors for its
effectiveness.
Low doses of UV-C light (wavelength of 190-280 nm) to induce disease
resistance in a wide range of fruits and vegetables
32. 1.Management of post harvest disease of
fruits and vegetables
C. Biological methods
refers to the use of naturally found microorganisms which antagonize the postharvest
pathogens we wish to suppress
Strains of Pseudomonas putida and Chryseobacterium indologenes were found to reduce
the incidence of gray mold rot on fruits under field conditions
Candida oleophila(Aspire) to control P. expansum, Botrytis cinerea, and R, stolonifer
under various cold-storage conditions
Pseudomonas syringae is a biological products for commercial postharvest applications
to citrus fruits:
Field sprays of strawberry flowers with antagonistic non-pathogenic Trichoderma viridae
isolates resulted in a decreased incidence of gray rot (B. cinerea) during storage
33. 1.Management of post harvest disease of
fruits and vegetables
D. Chemical methods
1. Pre-harvest chemical treatments
application of broad-spectrum protective fungicides to the developing fruit on the
plant, in order
to prevent spore germination or
infection establishment in the lenticels or in floral remnants of the fruit.
Oranges are sprayed with benomyl before harvest, to prevent the development of
stem-end rot, which arises from infections of Diplodia natalensis and Phomopsis
citri .
34. 1.Management of post harvest disease of
fruits and vegetables
D. Chemical methods
2. Sanitation
may be achieved through the immediate disposal of every rotted fruit or
vegetable, or by immersing it in a disinfectant solution
Use of chlorinated water at 38-43°C to wash tomatoes in the
packinghouse prevents the buildup of inoculum in the water
Formaldehyde, isopropyl alcohol, quadronic ammonium compounds,
captan or other chemicals must be used for disinfecting packinghouse or
store rooms.
35. 1.Management of post harvest disease of
fruits and vegetables
D. Chemical methods
3. Post harvest Chemical treatments
selection of the appropriate chemical compound depends on
the sensitivity of the pathogen to the chemical substance
the ability of the substance to penetrate through surface barriers into the
infection site
the tolerance of the host, as expressed both by injury and other phytotoxic
effects, and by any adverse effect upon the quality of the product
36. 1.Management of post harvest disease of
fruits and vegetables
D. Chemical methods
3. Post harvest Chemical treatments
Captan (N-trichloromethylmercapto-4-cyclohexene-l,2-dicarboximide), which is
a bicarboximide fungicide, has been proven effective as a postharvest dip against
decay development in various fruits and vegetables, such as strawberries,
peaches, cherries, pears, figs and potatoes
Dicloran (2,6-dichloro-4-nitroaniline, DCNA, botran) is effective against several
postharvest fungi
Sulfur dioxide (SO2) is applied as a postharvest fumigation to grapes in order to
eradicate spores of Botrytis cinerea
37. 1.Management of post harvest disease of
fruits and vegetables
D. Chemical methods
3. Post harvest Chemical treatments
The benzimidazole compounds - thiabendazole (TBZ), benomyl.are active
against a broad spectrum of pathogenic fungi. Like Penicillium digitatum ,
Monilinia fructicola ,Colletotrichum gloeosporioides and so on
Metalaxyl (ridomil), which is an acylalanine fungicide, acts as a strong inhibitor
of the various developmental stages of Phytophthora spp.
Essential oils and plant extracts are sources of antifungal activity against a wide
range of fungi for eg. palmarosa (Cymbopogon martini) and red thyme (Thymus
zygis) showed the greatest inhibitory effect on B. cinerea spore germination at
the lowest concentration.
38. 1.Management of post harvest disease of
fruits and vegetables
D. Chemical methods
3. Post harvest Chemical treatments
Gel derived from Aloe vera plants has been found to have antifungal
activity against four common postharvest pathogens:
Penicillium digitatum, P. expansum, B. cinerea and A. alternata.
The natural gel suppressed both germination and mycelial growth, with P.
digitatum and A. alternata being the most sensitive species
39. 2. Management of postharvest disease of
cereals and pulses
Avoid Infestation of through the use of fumigants. This helps to reduce rapid
growth of storage fungi.
The stored grain should not be unripe or too old; it should be clean, and be free
of mechanical damage
The moisture content should kept at levels below the minimum required for the
growth of the common storage fungi i.e. below 12%
The temperature of stored grain should kept as low as possible, . As it slows
down the respiration of grain and prevents an increase of moisture in grain.
40. 2. Management of postharvest disease of
cereals and pulses
• Ideally, grain should be cooled after drying and maintained at 1°C to 4 °C
for the duration of storage, while during the summer months the grain
temperature can be maintained between 10 and 15°C.
• Both reductions in oxygen tension and increase in carbon dioxide
concentrations can have profound effects on the growth of fungi
• Decreasing O2 to<0.14% and increasing CO2 >50% is required for
inhibition of mycelial growth and will prevent mycotoxin production.
1. For example melons with a thick skin and raspberries with a firm texture are better able, than others, to withstand the rigors of harvesting and handling and should, therefore, have longer storage lives.
2. . For example, high temperature was found to increase Botrytis cinerea infection of tomatoes via the flowers because it increased the rate of flower development and senescence.
3. . For example, high temperature was found to increase Botrytis cinerea infection of tomatoes via the flowers because it increased the rate of flower development and senescence.
4. Wider within-row plant spacing reduced Botrytis rot in strawberries compared with narrower spacing.