This document discusses the white rust disease that affects plants in the mustard family. It is caused by the fungus Albugo Candida. The disease causes white blister-like lesions on leaves, stems, and flowers. When severe, it can cause distorted growth. The fungus overwinters in soil or infected plant debris as oospores. In spring, the oospores produce zoospores that infect new plants, starting the disease cycle. Secondary infections spread the disease within a growing season. Warm, wet conditions favor disease development. Management includes removing debris, rotating crops, and applying fungicide sprays.
Red rot of sugarcane is caused by the fungus Colletotrichum falcatum. It was first identified in Java in 1893 and causes significant economic losses by reducing cane weight and sugar recovery. Symptoms include reddening of the stalk pith and small red spots on leaves. The disease spreads through infected soil and planting material. Management strategies include crop rotation, sanitation, resistant varieties, and hot water treatment of setts.
This document discusses loose smut and flag smut of wheat. Loose smut is caused by the fungus Ustilago nuda tritici. It is seed-borne and causes entire wheat heads to be converted into black spore masses, reducing yields by 2-3%. Flag smut is caused by Urocystis tritici and produces grey-black lesions on leaves and stems. Both diseases are favored by humid conditions. Management strategies include seed treatment, growing resistant varieties, and crop rotation to break disease cycles.
This document discusses black rust of wheat, caused by the fungal pathogen Puccinia graminis tritici. Black rust primarily affects wheat stems, appearing as elongated reddish-brown pustules. It completes its disease cycle on wheat plants and barberry bushes. Symptoms include merging pustules that eventually turn black. Control methods include removing barberry bushes, mixed cropping, chemical fungicides, and developing resistant wheat varieties.
- The document describes early blight, a fungal disease of potato caused by Alternaria solani. It was first described in 1882 and causes dark lesions on potato leaves and tubers.
- The disease cycle involves primary infection from inoculum on infected plant debris or other hosts, followed by secondary spread between leaves by conidia dispersed by wind during periods of wet and dry weather.
- Management strategies include using resistant varieties, removing crop debris, adjusting irrigation and fertilizer, rotating crops, and applying fungicide sprays.
This document discusses the white rust disease that affects plants in the mustard family. It is caused by the fungus Albugo Candida. The disease causes white blister-like lesions on leaves, stems, and flowers. When severe, it can cause distorted growth. The fungus overwinters in soil or infected plant debris as oospores. In spring, the oospores produce zoospores that infect new plants, starting the disease cycle. Secondary infections spread the disease within a growing season. Warm, wet conditions favor disease development. Management includes removing debris, rotating crops, and applying fungicide sprays.
Red rot of sugarcane is caused by the fungus Colletotrichum falcatum. It was first identified in Java in 1893 and causes significant economic losses by reducing cane weight and sugar recovery. Symptoms include reddening of the stalk pith and small red spots on leaves. The disease spreads through infected soil and planting material. Management strategies include crop rotation, sanitation, resistant varieties, and hot water treatment of setts.
This document discusses loose smut and flag smut of wheat. Loose smut is caused by the fungus Ustilago nuda tritici. It is seed-borne and causes entire wheat heads to be converted into black spore masses, reducing yields by 2-3%. Flag smut is caused by Urocystis tritici and produces grey-black lesions on leaves and stems. Both diseases are favored by humid conditions. Management strategies include seed treatment, growing resistant varieties, and crop rotation to break disease cycles.
This document discusses black rust of wheat, caused by the fungal pathogen Puccinia graminis tritici. Black rust primarily affects wheat stems, appearing as elongated reddish-brown pustules. It completes its disease cycle on wheat plants and barberry bushes. Symptoms include merging pustules that eventually turn black. Control methods include removing barberry bushes, mixed cropping, chemical fungicides, and developing resistant wheat varieties.
- The document describes early blight, a fungal disease of potato caused by Alternaria solani. It was first described in 1882 and causes dark lesions on potato leaves and tubers.
- The disease cycle involves primary infection from inoculum on infected plant debris or other hosts, followed by secondary spread between leaves by conidia dispersed by wind during periods of wet and dry weather.
- Management strategies include using resistant varieties, removing crop debris, adjusting irrigation and fertilizer, rotating crops, and applying fungicide sprays.
Red rot of sugarcane is caused by the fungus Colletotrichum falcatum. It was first reported in 1893 in Java and causes significant losses in sugarcane crops. Symptoms include yellowing of leaves, shriveled canes that are light in weight and easily broken with reddening of the pith. The pathogen survives in plant setts, infected plant debris, and soil. Management strategies include using disease-free setts, hot water or hot air treatment of setts, removing infected plant material, crop rotation, and growing resistant varieties.
This document summarizes information about red rot disease of sugarcane. It begins with an introduction about the importance of sugarcane as a source of sugar production. It then discusses the history of the disease, first reported in Java in 1893. The causal organism is Colletotrichum falcatum, which has both asexual and sexual reproduction stages. Symptoms appear after rains when plant growth stops and sugar formation begins, showing yellowing, shriveled canes with reddening pith. The disease cycle and management approaches are also summarized, including using disease-free setts, hot water treatment, removal of infected stools, crop rotation, and resistant varieties.
Rust is a plant disease caused by obligate parasitic fungi belonging to the class basidiomycetes. The disease causes severe damage to wheat, oats, barley, and vegetable crops. Symptoms include rust-colored spots on leaves and stems that rupture the epidermis. Rust fungi like Puccinia infect hosts like wheat, barley, oats, and beans. They have complex life cycles producing spores that allow the disease to spread. Control methods include removing alternate hosts, growing resistant varieties, spraying fungicides, crop rotation, and field sanitation.
This document summarizes information about a fungal disease that affects pigeon pea crops. It is caused by the fungus Fusarium udum, which can cause losses of up to 50% of pigeon pea crops. The fungus affects plants through the vascular tissue, causing wilting and death. It generally appears after rainy seasons and symptoms include blackening of the stem near the soil. The document also provides details on the taxonomy of the fungus, its structures like macroconidia and chlamydospores, favored temperature, and recommendations for crop rotation, mixed cropping, green manuring, and resistant varieties to manage the disease.
This document discusses different criteria for classifying plant diseases. It describes classification based on mode of perpetuation (soil-borne, air-borne, seed-borne), infectious nature (infectious vs. non-infectious), number of pathogen generations (single-cycle, multi-cycle, polyetic), extent of plant parts affected (localized, systematic), cause of disease (biotic, abiotic, mesobiotic), occurrence and geographic distribution (epidemic, endemic, sporadic, pandemic), plant part affected, crop affected, and symptoms produced. For each criteria, examples are provided such as damping off for soil-borne diseases and powdery mildew for air-borne diseases. The key points of classification
White rust, caused by the fungus Albugo candida, affects all parts of cruciferous plants except the roots. It causes powdery white or creamy yellow blister-like pustules on leaves, stems, flower stalks, and siliques. If the infection is systemic, it results in hypertrophy and hyperplasia, distorting and swelling stems and floral parts. The disease can cause yield losses between 17-37%. Management strategies include using certified seed, seed treatment, removing weeds, crop rotation, deep plowing, balanced fertilization, and fungicide sprays of mancozeb or mixtures of metalaxyl and mancozeb.
This document provides information about loose smut of wheat, a fungal disease caused by Ustilago segetum and Ustilago tritici. Loose smut infects wheat plants systemically and symptoms appear after the ears emerge. The entire ear, except for the awns, becomes converted into black powdery spores covered by a silvery membrane. Management strategies include using healthy seed for sowing, seed treatment with fungicides, and growing resistant wheat varieties. The pathogen can survive in the seed embryo and is spread through infected seed.
Downy mildew of grapes refers to any of several types of oomycete microbes that are obligate parasites of plants. Downy mildews exclusively belong to Peronosporaceae. In commercial agriculture, they are a particular problem for growers of crucifers, grapes and vegetables that grow on vines. slide contains vivid descrition of the plant pathogen.
This document summarizes yellow vein mosaic disease of okra, caused by the bhindi mosaic virus 1 and hibiscus virus 1. The disease is transmitted by whiteflies and leafhoppers and affects leaves, causing vein clearing, chlorosis, and thickening. Symptoms include stunted and less productive plants with fewer, smaller, and deformed fruits. Management involves removing infected plants, controlling the insect vectors with insecticides, and growing resistant varieties.
This ppt illustrates and describes the two bacterial diseases included in the BSc Hons Program Syllabys Core Course III or DSC 3- Citrus canker and angular leaf spot of cotton
This document provides information about stem rust or black rust of wheat, a fungal disease caused by Puccinia graminis f. sp. tritici. It discusses the disease's global and regional distribution, symptoms, effects on plants, disease cycle involving different hosts, and management strategies including the use of resistant varieties and fungicide application. Key points are that it is a major epidemic disease worldwide, especially in South and North India from March to December, and can cause up to 90% yield losses if left uncontrolled.
In this PPT you will come to know about the different types of mosaic virus which is caused in BHENDU crop, its life cycle, epidemiology, and its management.
This document discusses three types of rust that affect wheat - stem rust, leaf rust, and stripe rust. It focuses on stem rust, the most destructive wheat disease, which can reduce yields by up to 70%. The fungus that causes stem rust is Puccini graminis f. sp. tritici and infects wheat, barley, and barberry plants. It has a complex life cycle involving five spore stages that allows it to repeatedly infect wheat crops throughout the growing season. Management strategies include growing resistant wheat varieties, applying fungicides, employing cultural practices like early crop maturation, and eliminating barberry plants that serve as an alternate host.
Yellow vein mosaic virus is a devastating disease of okra (Abelmoschus esculentus) in India. It was first reported in India in 1924 and causes up to 80% crop loss if plants are infected early. The causal agent is a begomovirus transmitted by the whitefly Bemisia tabaci. Infected plants show a yellow vein pattern and stunting, and fruits are small and deformed. Management strategies include removing infected plants, controlling weed hosts, crop rotation, resistant varieties, and insecticide sprays.
1) The document discusses several downy mildew pathogens that infect various millet crops. It describes the causal organisms, symptoms, disease cycle and management strategies for key diseases like sorghum downy mildew caused by Peronosclerospora sorghi and pearl millet downy mildew caused by Sclerospora graminicola.
2) It provides details on the distribution, pathogen characteristics, and impact of these diseases. Downy mildews can cause significant yield losses, with some pathogens reducing millet grain production by up to 50% in certain years.
3) The document emphasizes the importance of adopting integrated management practices like growing resistant varieties, seed treatment, foliar application
Symptoms of bacterial infection in plants are much like the symptoms in fungal plant disease.
They include
leaf spots,
blights,
wilts,
scabs,
cankers and a
soft rots of roots,
storage organs and fruit,
Fungi constitute the largest number of plant pathogens and are responsible for a range of serious plant diseases. Most vegetable diseases are caused by fungi. They damage plants by killing cells and/or causing plant stress. Sources of fungal infections are infected seed, soil, crop debris, nearby crops and weeds.
Late blight of potato is caused by the oomycete Phytophthora infestans. It was first described in the 1840s and caused the Irish potato famine. The disease affects potato and tomato leaves, stems, and tubers, causing lesions and rot. Favorable conditions for the disease include temperatures of 16-22°C and wet weather. Management strategies include using disease-free seed tubers, fungicide sprays, crop rotation, and resistant varieties.
This document summarizes several fungal, bacterial, and viral diseases that affect wheat. It describes 9 fungal diseases caused by various Puccinia, Ustilago, Tilletia, Erysiphe, and Pythium species. The diseases discussed are yellow/stripe rust, brown/leaf rust, stem/black rust, loose smut, common bunt, powdery mildew, flag smut, and foot rot. It provides details on symptoms, pathogens, life cycles, survival methods and spread, and favorable conditions for each disease. Management approaches are also mentioned. The document additionally briefly discusses 1 bacterial disease and 3 viral diseases that impact wheat.
The document discusses early blight and late blight, two major fungal diseases of potato. Late blight is caused by Phytophthora infestans and early blight is caused by Alternaria alternata. Late blight causes small, green, water-soaked leaf lesions while early blight causes small, black or brown lesions often with a yellow halo. Both diseases can significantly reduce potato yields. Control measures include using disease-free seed potatoes, destroying infected plant material, growing resistant varieties, and applying fungicide sprays when symptoms first appear.
Cattaneo from Italy published the first description of stem rot or sclerotial disease in
1876. Since then, reports of it have come from a number of rice-growing nations, including
Japan, the United States, Ceylon, Burma, Vietnam, the Philippines, and China. In India it was
first observed in Bengal in 1911. Butler later documented the condition in full a year later, in
1918. Since then, the majority of states that farm rice have reported it. Damage varies
depending on the tract and possibly depending on the season. Stem rot of rice is caused by **Sclerotium oryzae**¹. It is one of a number of organisms that can damage rice leaf sheaths and/or stems. Others are listed in the “Rice field guide to pests, diseases and weeds”¹. The fungus infects the leaf sheath, leading to leaf death and rotting of the stem¹.
Source: Conversation with Bing, 15/9/2023
(1) https://en.wikipedia.org/wiki/Magnaporthe_salvinii#:~:text=Magnaporthe%20salvinii%20%28%20teleomorph%29%2C%20also%20known%20as%20Sclerotium,small%2C%20black%2C%20irregular%20lesion%20on%20the%20leaf%20sheath.. https://en.wikipedia.org/wiki/Magnaporthe_salvinii.
(2) AN OVERVIEW OF STEM ROT DISEASE OF RICE (Sclerotium oryzae Catt.) AND .... https://www.fortunejournals.com/ijabpt/pdf/96010-K%20Gopika.pdf.
(3) Induced tolerance against stem-rot disease of low-land ... - Springer. https://link.springer.com/article/10.1007/s42161-021-00948-5.
(4) Pathogenic and Molecular Variability in Sclerotium Oryzae Catt.. https://chesci.com/wp-content/uploads/2021/08/v10i39_8_cs122052031_367-371.pdf.
https://vikaspedia.in/agriculture/crop-production/package-of-practices/cereals-and-millets/paddy/rice
Sclerotium oryzae is a fungus that causes stem rot of rice. It is a major disease of rice in tropical and subtropical regions. The fungus can survive in soil for several years and can be spread by infected seeds, water, and farm implements.
The symptoms of stem rot of rice vary depending on the stage of growth of the plant. In young seedlings, the fungus can cause damping-off, which is the death of the seedlings at the soil level. In older plants, the fungus can cause the stems to rot and the leaves to wilt. The infected plants may also produce fewer grains.
To control stem rot of rice, a combination of cultural and chemical methods can be used. Cultural methods include:
* Planting resistant varieties of rice
* Avoiding waterlogging
* Rotating crops
* Burning crop residues
Chemical methods include:
* Applying fungicides to the soil before planting
* Treating the seeds with fungicides
* Applying fungicides to the plants during the growing season
If you suspect that your rice plants have stem rot, it is important to consult with a plant pathologist for diagnosis and treatment.
* The fungus is a white, cottony mass that can be found on the stems and leaves of infected plants.
* The fungus produces spores that can be spread by wind, water, and insect
Red rot of sugarcane is caused by the fungus Colletotrichum falcatum. It was first reported in 1893 in Java and causes significant losses in sugarcane crops. Symptoms include yellowing of leaves, shriveled canes that are light in weight and easily broken with reddening of the pith. The pathogen survives in plant setts, infected plant debris, and soil. Management strategies include using disease-free setts, hot water or hot air treatment of setts, removing infected plant material, crop rotation, and growing resistant varieties.
This document summarizes information about red rot disease of sugarcane. It begins with an introduction about the importance of sugarcane as a source of sugar production. It then discusses the history of the disease, first reported in Java in 1893. The causal organism is Colletotrichum falcatum, which has both asexual and sexual reproduction stages. Symptoms appear after rains when plant growth stops and sugar formation begins, showing yellowing, shriveled canes with reddening pith. The disease cycle and management approaches are also summarized, including using disease-free setts, hot water treatment, removal of infected stools, crop rotation, and resistant varieties.
Rust is a plant disease caused by obligate parasitic fungi belonging to the class basidiomycetes. The disease causes severe damage to wheat, oats, barley, and vegetable crops. Symptoms include rust-colored spots on leaves and stems that rupture the epidermis. Rust fungi like Puccinia infect hosts like wheat, barley, oats, and beans. They have complex life cycles producing spores that allow the disease to spread. Control methods include removing alternate hosts, growing resistant varieties, spraying fungicides, crop rotation, and field sanitation.
This document summarizes information about a fungal disease that affects pigeon pea crops. It is caused by the fungus Fusarium udum, which can cause losses of up to 50% of pigeon pea crops. The fungus affects plants through the vascular tissue, causing wilting and death. It generally appears after rainy seasons and symptoms include blackening of the stem near the soil. The document also provides details on the taxonomy of the fungus, its structures like macroconidia and chlamydospores, favored temperature, and recommendations for crop rotation, mixed cropping, green manuring, and resistant varieties to manage the disease.
This document discusses different criteria for classifying plant diseases. It describes classification based on mode of perpetuation (soil-borne, air-borne, seed-borne), infectious nature (infectious vs. non-infectious), number of pathogen generations (single-cycle, multi-cycle, polyetic), extent of plant parts affected (localized, systematic), cause of disease (biotic, abiotic, mesobiotic), occurrence and geographic distribution (epidemic, endemic, sporadic, pandemic), plant part affected, crop affected, and symptoms produced. For each criteria, examples are provided such as damping off for soil-borne diseases and powdery mildew for air-borne diseases. The key points of classification
White rust, caused by the fungus Albugo candida, affects all parts of cruciferous plants except the roots. It causes powdery white or creamy yellow blister-like pustules on leaves, stems, flower stalks, and siliques. If the infection is systemic, it results in hypertrophy and hyperplasia, distorting and swelling stems and floral parts. The disease can cause yield losses between 17-37%. Management strategies include using certified seed, seed treatment, removing weeds, crop rotation, deep plowing, balanced fertilization, and fungicide sprays of mancozeb or mixtures of metalaxyl and mancozeb.
This document provides information about loose smut of wheat, a fungal disease caused by Ustilago segetum and Ustilago tritici. Loose smut infects wheat plants systemically and symptoms appear after the ears emerge. The entire ear, except for the awns, becomes converted into black powdery spores covered by a silvery membrane. Management strategies include using healthy seed for sowing, seed treatment with fungicides, and growing resistant wheat varieties. The pathogen can survive in the seed embryo and is spread through infected seed.
Downy mildew of grapes refers to any of several types of oomycete microbes that are obligate parasites of plants. Downy mildews exclusively belong to Peronosporaceae. In commercial agriculture, they are a particular problem for growers of crucifers, grapes and vegetables that grow on vines. slide contains vivid descrition of the plant pathogen.
This document summarizes yellow vein mosaic disease of okra, caused by the bhindi mosaic virus 1 and hibiscus virus 1. The disease is transmitted by whiteflies and leafhoppers and affects leaves, causing vein clearing, chlorosis, and thickening. Symptoms include stunted and less productive plants with fewer, smaller, and deformed fruits. Management involves removing infected plants, controlling the insect vectors with insecticides, and growing resistant varieties.
This ppt illustrates and describes the two bacterial diseases included in the BSc Hons Program Syllabys Core Course III or DSC 3- Citrus canker and angular leaf spot of cotton
This document provides information about stem rust or black rust of wheat, a fungal disease caused by Puccinia graminis f. sp. tritici. It discusses the disease's global and regional distribution, symptoms, effects on plants, disease cycle involving different hosts, and management strategies including the use of resistant varieties and fungicide application. Key points are that it is a major epidemic disease worldwide, especially in South and North India from March to December, and can cause up to 90% yield losses if left uncontrolled.
In this PPT you will come to know about the different types of mosaic virus which is caused in BHENDU crop, its life cycle, epidemiology, and its management.
This document discusses three types of rust that affect wheat - stem rust, leaf rust, and stripe rust. It focuses on stem rust, the most destructive wheat disease, which can reduce yields by up to 70%. The fungus that causes stem rust is Puccini graminis f. sp. tritici and infects wheat, barley, and barberry plants. It has a complex life cycle involving five spore stages that allows it to repeatedly infect wheat crops throughout the growing season. Management strategies include growing resistant wheat varieties, applying fungicides, employing cultural practices like early crop maturation, and eliminating barberry plants that serve as an alternate host.
Yellow vein mosaic virus is a devastating disease of okra (Abelmoschus esculentus) in India. It was first reported in India in 1924 and causes up to 80% crop loss if plants are infected early. The causal agent is a begomovirus transmitted by the whitefly Bemisia tabaci. Infected plants show a yellow vein pattern and stunting, and fruits are small and deformed. Management strategies include removing infected plants, controlling weed hosts, crop rotation, resistant varieties, and insecticide sprays.
1) The document discusses several downy mildew pathogens that infect various millet crops. It describes the causal organisms, symptoms, disease cycle and management strategies for key diseases like sorghum downy mildew caused by Peronosclerospora sorghi and pearl millet downy mildew caused by Sclerospora graminicola.
2) It provides details on the distribution, pathogen characteristics, and impact of these diseases. Downy mildews can cause significant yield losses, with some pathogens reducing millet grain production by up to 50% in certain years.
3) The document emphasizes the importance of adopting integrated management practices like growing resistant varieties, seed treatment, foliar application
Symptoms of bacterial infection in plants are much like the symptoms in fungal plant disease.
They include
leaf spots,
blights,
wilts,
scabs,
cankers and a
soft rots of roots,
storage organs and fruit,
Fungi constitute the largest number of plant pathogens and are responsible for a range of serious plant diseases. Most vegetable diseases are caused by fungi. They damage plants by killing cells and/or causing plant stress. Sources of fungal infections are infected seed, soil, crop debris, nearby crops and weeds.
Late blight of potato is caused by the oomycete Phytophthora infestans. It was first described in the 1840s and caused the Irish potato famine. The disease affects potato and tomato leaves, stems, and tubers, causing lesions and rot. Favorable conditions for the disease include temperatures of 16-22°C and wet weather. Management strategies include using disease-free seed tubers, fungicide sprays, crop rotation, and resistant varieties.
This document summarizes several fungal, bacterial, and viral diseases that affect wheat. It describes 9 fungal diseases caused by various Puccinia, Ustilago, Tilletia, Erysiphe, and Pythium species. The diseases discussed are yellow/stripe rust, brown/leaf rust, stem/black rust, loose smut, common bunt, powdery mildew, flag smut, and foot rot. It provides details on symptoms, pathogens, life cycles, survival methods and spread, and favorable conditions for each disease. Management approaches are also mentioned. The document additionally briefly discusses 1 bacterial disease and 3 viral diseases that impact wheat.
The document discusses early blight and late blight, two major fungal diseases of potato. Late blight is caused by Phytophthora infestans and early blight is caused by Alternaria alternata. Late blight causes small, green, water-soaked leaf lesions while early blight causes small, black or brown lesions often with a yellow halo. Both diseases can significantly reduce potato yields. Control measures include using disease-free seed potatoes, destroying infected plant material, growing resistant varieties, and applying fungicide sprays when symptoms first appear.
Cattaneo from Italy published the first description of stem rot or sclerotial disease in
1876. Since then, reports of it have come from a number of rice-growing nations, including
Japan, the United States, Ceylon, Burma, Vietnam, the Philippines, and China. In India it was
first observed in Bengal in 1911. Butler later documented the condition in full a year later, in
1918. Since then, the majority of states that farm rice have reported it. Damage varies
depending on the tract and possibly depending on the season. Stem rot of rice is caused by **Sclerotium oryzae**¹. It is one of a number of organisms that can damage rice leaf sheaths and/or stems. Others are listed in the “Rice field guide to pests, diseases and weeds”¹. The fungus infects the leaf sheath, leading to leaf death and rotting of the stem¹.
Source: Conversation with Bing, 15/9/2023
(1) https://en.wikipedia.org/wiki/Magnaporthe_salvinii#:~:text=Magnaporthe%20salvinii%20%28%20teleomorph%29%2C%20also%20known%20as%20Sclerotium,small%2C%20black%2C%20irregular%20lesion%20on%20the%20leaf%20sheath.. https://en.wikipedia.org/wiki/Magnaporthe_salvinii.
(2) AN OVERVIEW OF STEM ROT DISEASE OF RICE (Sclerotium oryzae Catt.) AND .... https://www.fortunejournals.com/ijabpt/pdf/96010-K%20Gopika.pdf.
(3) Induced tolerance against stem-rot disease of low-land ... - Springer. https://link.springer.com/article/10.1007/s42161-021-00948-5.
(4) Pathogenic and Molecular Variability in Sclerotium Oryzae Catt.. https://chesci.com/wp-content/uploads/2021/08/v10i39_8_cs122052031_367-371.pdf.
https://vikaspedia.in/agriculture/crop-production/package-of-practices/cereals-and-millets/paddy/rice
Sclerotium oryzae is a fungus that causes stem rot of rice. It is a major disease of rice in tropical and subtropical regions. The fungus can survive in soil for several years and can be spread by infected seeds, water, and farm implements.
The symptoms of stem rot of rice vary depending on the stage of growth of the plant. In young seedlings, the fungus can cause damping-off, which is the death of the seedlings at the soil level. In older plants, the fungus can cause the stems to rot and the leaves to wilt. The infected plants may also produce fewer grains.
To control stem rot of rice, a combination of cultural and chemical methods can be used. Cultural methods include:
* Planting resistant varieties of rice
* Avoiding waterlogging
* Rotating crops
* Burning crop residues
Chemical methods include:
* Applying fungicides to the soil before planting
* Treating the seeds with fungicides
* Applying fungicides to the plants during the growing season
If you suspect that your rice plants have stem rot, it is important to consult with a plant pathologist for diagnosis and treatment.
* The fungus is a white, cottony mass that can be found on the stems and leaves of infected plants.
* The fungus produces spores that can be spread by wind, water, and insect
Sucking Insect pests of rice, Identification, Binomics, Integrated Pest Manag...PirithiRaju
However, rice crops are often plagued by various pests that can cause significant damage, reducing yield and quality. Sucking pests, such as planthoppers, leafhoppers, and aphids, pose a particularly significant threat to paddy crops.
The document discusses the bacterial disease Blackleg of Potato, caused by the pathogen Pectobacterium atrosepticum. It describes the history, symptoms, and lifecycle of the disease, which affects potato stems and tubers, causing decay. Cultural practices for managing the disease are outlined, including sterile propagation, planting timing, removing infected plant material, and proper storage to break the cycle of transmission from season to season.
This document discusses integrated disease management strategies for major potato diseases. It outlines 8 major potato diseases including symptoms: bacterial wilt, late blight, early blight, common scab, black scurf, black leg and soft rot, black heart, and leaf curl. It then discusses integrated disease management methods such as seed certification, biological control with antagonistic bacteria/fungi, use of resistant cultivars, chemical control, and cultural practices including sanitation, crop rotation, seed treatment, irrigation, fertilization, and harvest/storage techniques. Specific disease management strategies are recommended for different potato growth stages.
This document discusses major diseases that affect common bean and faba bean production in Ethiopia. It identifies 25 common bean diseases reported in the country, with the top 5 most important and widely distributed being anthracnose, rust, common bacterial blight, halo blight, and angular leaf spot. It provides details on symptoms, management strategies like host resistance and fungicides, and the disease cycle for each of these top 5 diseases. It also discusses 3 major faba bean diseases - chocolate spot, rust, and black rot - and provides details on chocolate spot symptoms and impacts.
1. The document provides information on various diseases that affect rice crops, including blast caused by Pyricularia oryzae, brown spot caused by Helminthosporium oryzae, sheath rot caused by Sarocladium oryzae, stem rot caused by Sclerotium oryzae, narrow brown leaf spot caused by Cercospora oryzae, and sheath blight caused by Rhizoctonia solani.
2. It describes the symptoms, etiology, disease cycle and favorable conditions for each disease. Management strategies provided for each include using disease-free seeds, removing weed hosts, proper fertilizer use, crop rotation, resistant varieties,
Sweet potato stem rot is caused by the fungus Fusarium oxysporum f. sp. batatas, which infects the stems and vascular bundles of sweet potato plants, causing interveinal leaf yellowing, wilting, stunting, and death. The fungus spreads primarily through infected planting materials and can survive in diseased vines or as chlamydospores in the soil. Management strategies include soil solarization, crop rotation, and dipping planting materials in fungicides to control spread and reduce disease incidence.
Onion, garlic diseases and their aspects.Manohar34060
This document summarizes several fungal and bacterial diseases that affect onions and garlic. It describes 7 fungal diseases of onions including purple blotch caused by Alternaria porri, Stemphylium blight caused by Stemphylium vesicarium, downy mildew caused by Peronospora destructor, onion smut caused by Urocystis cepulae, and onion smudge caused by Colletotrichum circinans. It also briefly outlines 2 bacterial rots of onions. For each disease, it provides information on symptoms, pathogens, disease cycles and recommended management practices.
Black scurf, potato wart, and charcoal rot are major fungal diseases of potato. Black scurf causes dark crusty lesions on tubers and stems and can lead to 25-100% yield losses. It is caused by Rhizoctonia solani and controlled by planting disease-free seed and crop rotation. Potato wart forms rough galls on tubers and underground stems and causes 50-100% losses. It is caused by Synchytrium endobioticum and the only control is planting resistant varieties. Charcoal rot causes soft black lesions on tubers and stems and reduces yields by 42%. It is caused by Macrophomina phaseolina and can be managed by planting early maturing
Pests of sugarcane_Binomics_IPM_Dr.UPR.pdfPirithiRaju
PESTS OF SUGARCANE - BORERS
BORERS
1. Early shoot borer, Chilo infuscatellus, Crambidae, Lepidoptera
Symptom of damage: Deadheart in 1-3 month old crop, which can be easily pulled out, rotten portion of the straw coloured dead-heart emits an offensive odour. A number of bore holes at the base of the shoot just above the ground level.
Nature of damage: Caterpillar bores into the central shoot and feeds on the internal tissue. This cause interference in the translocation of plant sap and damage the sugar storing tissues.
Egg: Flat-scale like eggs are laid in 3-5 rows on the lower surface of leaves in masses of 4-100. The masses are slightly overlapping like tiles.
Larva: Larva is dirty white with five dark violet longitudinal stripes and dark brown head.
Pupa: Pupation takes place within the tunnel. Caterpillar before pupating makes a large exit hole in the stem and blocks the opening with silken discs.
Adult: Pale greyish brown moth with black dots near the costal margin of the forewings and with white hindwings.
2. Internode borer, Chilo sacchariphagus indicus, Crambidae, Lepidoptera
Symptom of damage: Internodes constricted and shortened, with a number of boreholes and fresh excreta in the nodal region. Affected tissues reddened.
Nature of damage: Caterpillars attack sugarcane plants after 3 months of planting. They bore into the canes near the nodes; entry holes are plugged with excreta. Entry is generally confined to the first five internodes.
Egg: Scale-like white eggs are laid by female moths in batches of 9-11, near the midribs, on leaf sheaths or on stem.
Larva: White larva with four violet longitudinal stripes and light brown head.
Pupa: Pupation takes place in semi-dried leaf sheath.
Adult: Pale brown with white hind wings.
3. Top borer, Scirpophaga excerptalis, Pyralidae, Lepidoptera
Symptom of damage: Deadheart in grownup canes, which cannot be easily pulled; deadheart reddish brown in colour; parallel row of shot holes in the emerging leaves and red tunnels in the midribs of leaves; bunchy tip due to the growth of side shoots.
Nature of damage: Caterpillars are mainly found in the apical portion of the canes, boring through the growing point and down the upper joints until it reaches the sappy portion of the stem, there it feeds on the tissues and destroys the cane. They also bore into the unfolded leaves preferably into the midrib, mining its way to the base.
Egg: Eggs are laid on the lower surface of top leaves in clusters particularly near midribs. The clusters are covered with buff coloured hairs.
Larva :Smooth, white or cream coloured with a red coloured mid-dorsal line and yellow head.
Pupa: Pupation takes place within the larval tunnel in a chamber with an exit hole constructed by the caterpillar.
Adult: White coloured moth (with a buff coloured anal tuft in the abdominal tip of female).
Potato is an important crop worldwide and in India. It was introduced to India in the 17th century from South America. Potato breeding aims to develop varieties with traits like increased yield, earliness, pest and disease resistance. As a tetraploid crop, potato has complex genetics. Breeding efforts focus on traits like tuber appearance, plant type, maturity, dormancy, and resistance to diseases like late blight and viruses.
This document lists and describes 10 common cowpea diseases: seedling mortality, anthracnose, pythium stem rot, sclerotium stem rot, fusarium wilt, brown rust, black spot, powdery mildew, bacterial blight, and cowpea mosaic virus. It provides details on the causal agents, symptoms, spread, and potential controls for each disease.
Pests of cumbu_Identification, Binomics, Integrated ManagementDr.UPR.pdfPirithiRaju
Cumbu, also known as pearl millet or bajra, is a widely cultivated grain crop primarily grown in regions with semi-arid climates. Like any other crop, cumbu is susceptible to various pests that can significantly affect its yield and quality. Some of the common pests that attack cumbu include:
Stem Borers: These are the larvae of various moth species that bore into the stem of the plant, leading to wilting, lodging, and ultimately reducing yield.
Shoot Fly: The shoot fly lays eggs in the leaf axils, and the hatched larvae feed on the developing shoots, causing dead hearts and stunted growth.
Aphids: These small insects feed on the sap of the plant, causing stunted growth, yellowing of leaves, and reducing overall vigor.
Termites: Termites can attack cumbu plants, particularly in dryland areas, by feeding on roots and causing wilting and lodging.
Grasshoppers and Locusts: These voracious feeders can cause significant damage to cumbu crops by consuming foliage, leading to reduced photosynthesis and yield loss.
Armyworms: Larvae of certain moth species, such as the African armyworm, can defoliate cumbu plants, leading to yield loss if not controlled.
Leafhoppers: These insects suck sap from the leaves, causing yellowing, wilting, and reduced plant vigor.
White Grubs: The larvae of certain beetle species feed on the roots of cumbu plants, leading to reduced nutrient uptake and stunted growth.
Mites: Various species of mites can infest cumbu plants, causing stippling on leaves, reduced photosynthesis, and overall reduced plant health.
Thrips: Thrips feed on leaves and flowers, causing stippling, distortion, and discoloration of plant tissues.
To manage these pests, integrated pest management (IPM) strategies are often employed, which may include cultural practices, biological control, and judicious use of pesticides when necessary. Crop rotation, planting resistant varieties, maintaining proper plant nutrition, and timely scouting for pest presence are important components of pest management in cumbu cultivation.
The document summarizes information about Bengal gram rust, a fungal disease of chickpeas. It discusses the pathogen (Uromyces ciceris-arietini), symptoms which include light to dark brown pustules on leaves and stems, distribution in India and other countries, and management strategies such as early sowing, crop rotation, and fungicide application. The disease is more prevalent in cooler regions and favors infection through weed hosts like Trigonella polycerata.
This document provides information on the white grub pest that damages ginger crops. It begins with the systematic classification of white grubs, then describes the different life stages including eggs, larvae, pupae, and adults. Diagrams are included. The document discusses the host plants of white grubs, their distribution, nature of damage caused, and life cycle. It then provides details on cultural, biological, and chemical control methods that can be used to manage white grub populations.
(June 12, 2024) Webinar: Development of PET theranostics targeting the molecu...Scintica Instrumentation
Targeting Hsp90 and its pathogen Orthologs with Tethered Inhibitors as a Diagnostic and Therapeutic Strategy for cancer and infectious diseases with Dr. Timothy Haystead.
The cost of acquiring information by natural selectionCarl Bergstrom
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdfSelcen Ozturkcan
Ozturkcan, S., Berndt, A., & Angelakis, A. (2024). Mending clothing to support sustainable fashion. Presented at the 31st Annual Conference by the Consortium for International Marketing Research (CIMaR), 10-13 Jun 2024, University of Gävle, Sweden.
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...Advanced-Concepts-Team
Presentation in the Science Coffee of the Advanced Concepts Team of the European Space Agency on the 07.06.2024.
Speaker: Diego Blas (IFAE/ICREA)
Title: Gravitational wave detection with orbital motion of Moon and artificial
Abstract:
In this talk I will describe some recent ideas to find gravitational waves from supermassive black holes or of primordial origin by studying their secular effect on the orbital motion of the Moon or satellites that are laser ranged.
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
The debris of the ‘last major merger’ is dynamically youngSérgio Sacani
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
Authoring a personal GPT for your research and practice: How we created the Q...Leonel Morgado
Thematic analysis in qualitative research is a time-consuming and systematic task, typically done using teams. Team members must ground their activities on common understandings of the major concepts underlying the thematic analysis, and define criteria for its development. However, conceptual misunderstandings, equivocations, and lack of adherence to criteria are challenges to the quality and speed of this process. Given the distributed and uncertain nature of this process, we wondered if the tasks in thematic analysis could be supported by readily available artificial intelligence chatbots. Our early efforts point to potential benefits: not just saving time in the coding process but better adherence to criteria and grounding, by increasing triangulation between humans and artificial intelligence. This tutorial will provide a description and demonstration of the process we followed, as two academic researchers, to develop a custom ChatGPT to assist with qualitative coding in the thematic data analysis process of immersive learning accounts in a survey of the academic literature: QUAL-E Immersive Learning Thematic Analysis Helper. In the hands-on time, participants will try out QUAL-E and develop their ideas for their own qualitative coding ChatGPT. Participants that have the paid ChatGPT Plus subscription can create a draft of their assistants. The organizers will provide course materials and slide deck that participants will be able to utilize to continue development of their custom GPT. The paid subscription to ChatGPT Plus is not required to participate in this workshop, just for trying out personal GPTs during it.
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...Leonel Morgado
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
1. Potato wart disease
Purusothaman, C.
III B. Sc., Microbiology
PG & Research Department of Biotechnology and
Microbiology
National College (Autonomous)
Tiruchirappalli- 620001, Tamil Nadu, India
2. Introduction
Syncahytrium endobioticum causes the wart
disease of potato
According to karling, it has a broad spectrum of
solonaceous sp. In its host range
The potato wart disease is widely distributed in
the potato growing regions in the world
It is prevalent in areas with cool moist climate
4. Distribution
S. endobioticum originated in south America
It was introduced from there into the UK and from
there to continental Europe in 1880s
It has spread to a limited extend only in other parts of
the world
In India it has been reported from the Darjeeling
district(west Bengal)
5. Symptoms
Aerial symptoms
Aerial symptoms are not usually apparent. There may, however,
be a reduction in vigour.
Warts can be found in severe attacks on the upper stem, leaf
and flower. Leaf stalks may develop hypertrophic 'wings'.
Above-ground galls are green to brown, turning black at
maturity, and later decaying.
6. Subterranean symptoms
Galls vary in shape but are mostly spherical, with
corrugated surfaces, and range from pea-size to fist-size <1
cm to >8 cm diam.).
Below ground galls are white to brown, turning black as
they decay
Tubers may be disfigured or completely replaced by galls.
Tuber galls may develop after harvest, in storage.
7. Diagnosis
Polymerase chain reaction (PCR) and real-time PCR have been
developed to diagnose Synchytrium endobioticum
8. Prevention on control
According to OEPP/EPPO (1990) specific quarantine requirement,
potatoes should derive from a stock free of S. endobioticum.
Use a continuous "cover crop" to reduce movement of inoculum via
wind-blown soil.
Amendment of infested soil with crushed crab shell (23% chitin) has
been found to suppress the disease in some situations.
Steam sterilization of soil.
Soil treatment – mercuric chloride and formalin
New tolerant or resistant varieties (eg: Kufri Kanchar, Kufri sherpa,
Kufri jyothi).