ANTHRACNOSE OF POMEGRANATE
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Pomegranate anthracnose is caused by the fungus Colletotrichum gleosporioides. It causes spotting and rotting of pomegranate fruits, reducing both price and quality. The fungus is found worldwide in tropical regions and spreads via infected leaves and wind-borne spores. High temperatures and humidity provide favorable conditions for growth of the pathogen. Chemical management includes fungicide sprays while biological control uses competitive fungi.
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The disease is also prevalent in Haryana Rajasthan , A.P ,
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Wilt is a pernicious disease of guava in India.
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This document discusses 5 diseases that affect sapota trees:
1. Leaf spot caused by Phaeopleospora indica, which causes circular brown spots on leaves. It is managed by spraying fungicides.
2. Pestalotiopsis leaf spot caused by Pestalotiopsis versicolor, which causes small reddish-brown spots on leaves that enlarge and develop gray centers.
3. Flat limb caused by Botryodiplodia theobromae, which causes branches to become flat and twisted and leaves to become small and yellow, reducing fruit production.
4. Sooty mould caused by Capnodium versicolor, which grows on insect excretions and causes
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This document summarizes several diseases that affect pea crops:
- Fusarium wilt causes wilting and death of plants and is spread through soil and seed. Hot weather promotes its growth. Seeds can be treated and soil drenched to manage it.
- Powdery mildew causes white powdery spots on leaves and malformed pods. It spreads through air and likes warm, humid conditions. Crop residues should be burned and resistant varieties used.
- Downy mildew causes gray-white mold on leaves and pods and spreads through soil, seed and water. High humidity and cool temperatures encourage it. Infected plants should be removed.
- Rust causes reddish-brown spots on leaves and dry plants
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1. The document discusses three main diseases that affect coriander: Fusarium wilt caused by Fusarium oxysporum f.sp.corianderii, stem gall caused by Protomyces macrosporus, and powdery mildew caused by Erysiphe polygoni.
2. These diseases can cause significant yield reductions in coriander under favorable weather conditions for disease development like high soil moisture.
3. Management of these diseases involves practices like crop rotation, removal of plant debris, use of resistant varieties, and fungicide applications.
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Bean anthracnose is a seedborne fungal disease caused by Colletotrichum lindemuthianum that affects many legume crops worldwide. The disease causes reddish-brown lesions on pods and leaves that produce pink spores in moist conditions, reducing crop yields. The fungus spreads primarily via contaminated seeds and crop debris, with secondary spread by rain splash and wind under favorable conditions of 13-26°C, 92% humidity, and moderate rainfall. Management strategies include crop rotation, seed treatment, fungicide application, soil solarization, and biological controls using Trichoderma viride or plant extracts.
Banana cigar end rot
This document summarizes information about the banana cigar end rot disease. It is caused by the fungi Verticillium theobromae and Trachysphaera fructigena. Symptoms include blackening and folding of banana finger tips, giving them a corrugated and ash-covered appearance resembling a cigar. The disease favors high rainfall, humidity, and temperatures between 18-22°C. Management strategies include cultural practices like removing bracts and opening up bunches, chemical control with fungicide sprays, and removing pistils and perianth from fruits.
2015021026 citrus scab
Major disease in Citrus crop.
Tangerine cultivar is highly susceptible.
Symptoms appear on twigs,petioles,leaves and on fruits.
Grey Blight in Horticultural Crops
This document discusses grey blight, a fungal disease that affects several horticultural crops. It is caused by species of the fungus genus Pestalotiopsis. The document provides details on the disease's symptoms, pathogen characteristics, epidemiology and management in mango, tea, and coconut crops. Heavy infection occurs during monsoon season at 20-25°C with high humidity. Management involves removing infected plant parts, spraying fungicides like copper oxychloride or mancozeb, and maintaining balanced nutrition.
2015021036 coconut bud rot
1. The causal organism of coconut bud rot is Phytophthora palmivora, an oomycete fungus. (2) Coconut bud rot was first reported in 1834 in the West Indies and has since been reported worldwide in coconut growing regions. (3) In India, coconut bud rot is widely prevalent along the east and west coasts, affecting states like Tamil Nadu.
NORTHERN AND SOUTHERN CORN LEAF BLIGHT
This document discusses two diseases that affect corn - Northern Corn Leaf Blight (NCLB) and Southern Corn Leaf Blight (SCLB). It provides details on the significance, symptoms, causal pathogens, disease cycles and management of both diseases. NCLB is caused by the fungus Exserohilum turcicum and causes cigar-shaped lesions on leaves. SCLB is caused by Bipolaris maydis and produces small yellow spots on leaves that enlarge to elliptical lesions. Both diseases can cause significant yield losses in susceptible corn varieties. The document outlines the identification, epidemiology and control methods for each disease.
Diseases of horticultural crops
The document discusses four main diseases that affect small cardamom: Chenthal disease caused by Colletotrichum gloeosporioides which causes leaf blight; Azukal disease caused by Phytophthora nicotianae var. nicotianae which causes capsule rot; damping off caused by Pythium vexans which causes rotting of rhizomes and shoot collapse; and cardamom mosaic caused by Cardamom mosaic virus which results in mosaic symptoms and plant death. It provides details on the symptoms, causal organisms, mode of spread and management of each disease.
Balaji A 2015021018
Moko wilt is a bacterial disease of banana caused by Ralstonia solanacearum. It is prevalent worldwide in tropical and subtropical regions. The disease causes yellowing of leaves, internal rotting of fruits, and bacterial ooze from cut pseudostems. The bacteria survives in soil and infected planting materials and spreads through irrigation water. Disease management involves using disease-free suckers, resistant varieties, proper drainage, disinfecting irrigation water, and soil drenching with copper compounds.
Guava anthracnose
- Guava anthracnose is caused by the fungal pathogen Gloeosporium psidii. It affects guava plants and fruits.
- Symptoms include die back of branches, leaf spots, and sunken lesions on fruits. The disease is favored by moist conditions and temperatures between 10-35°C.
- The pathogen can survive on plant debris and spreads via airborne spores. Management involves resistant varieties, pruning, fungicide sprays, and post-harvest fruit dips.
Flat limb of sapota
The document discusses the flat limb disease of sapota, caused by the fungus Botryodiplodia theobromae. The disease causes twisting and flattening of sapota branches, resulting in fewer and smaller fruits. It is most prevalent in India in states like Maharashtra, Gujarat, Tamil Nadu, Karnataka, West Bengal and Andhra Pradesh, with integrated management including pruning of infected branches, fungicide application and destruction of plant debris.
Diseases of carnation and their management
Major diseases that affect carnations include Fusarium wilt caused by the fungus Fusarium oxysporum f.sp. dianthi, bacterial wilt caused by the bacterium Burkholderia caryophylli, and Alternaria leaf spot caused by the fungus Alternaria dianthi. Fusarium wilt causes wilting and discoloration of leaves and stems. Bacterial wilt results in pale wilting of upper plant parts with elongated stem discoloration and splitting. Alternaria leaf spot produces ashy white spots on leaves that develop into black fungal growth.
Sesamum diseases and management
This document provides information on major diseases that affect sesame crops and their management. It discusses 7 key diseases: phyllody caused by phytoplasma and transmitted by leafhoppers, stem and root rot caused by Macrophomina phaseolina fungus, Cercospora leaf spot caused by Cercospora sesami fungus, powdery mildew caused by Erysiphae cichoracearum fungus, Alternaria leaf spot caused by Alternaria sesami fungus, bacterial blight caused by Xanthomonas compestris pv. sesami bacteria, and bacterial leaf spot caused by Pseudomonas syringe pv sesame bacteria. For each disease, it describes symptoms, etiology, disease
Damping off of tobacco
This document discusses the causal organism, symptoms, and management of damping off disease in tobacco caused by Pythium aphanidermatum and Pythium debaryanum. It describes the pathogens as soil-borne oomycetes that cause pre- and post-emergence damping off in tobacco seedlings. Symptoms include water-soaked lesions on stems near the soil surface and rotting of the stem. The disease is favored by high soil moisture, low temperatures, and overcrowding. Management strategies include cultural controls like sanitation and spacing, as well as fungicide drenches and foliar applications of copper-based products.
Damping off of tobacco
Pythium aphanidermatum and Pythium debaryanum are soil-borne fungal pathogens that cause damping off disease in tobacco seedlings, leading to pre-emergence and post-emergence damping off that kills seedlings. The pathogens favor high soil moisture and humidity and can be managed through cultural practices like sanitation and drainage as well as fungicide drenches.
Arunkumar m pathology presentation
Bacterial blight of rice, Significance, Distribution, Pathogen character,Mode of spread, Symptoms, Life cycle, Method of control.
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ANTHRACNOSE OF POMEGRANATE
- 1. COLLEGE OF AGRICULTURAL TECHNOLOGY (Affiliated to Tamil Nadu Agricultural University, Coimbatore-3) Kullapuram (Po),ViaVaigai D Pomegranate anthracnose Colletotrichum gloesporioides STUDENT Miss KARISHMAA C ID. No. 2015021054 COURSE TEACHER Dr. PARTHASARATHY S Asst. Professor (Plant Pathology)
- 2. INTRODUCTION • Pomegranate anthracnose is a severe disease in karnataka it causes spotting and rot of pomegranate fruit leading to decrease in price and quality.
- 3. Taxonomic classification Kingdom: Fungi Phylum : Ascomycota Class :Sordariomycetes Order : Incertae sedis Family : Glomerellaceae Genus :Colletotrichum Species : C gleosporioides
- 4. Occurrence and distribution • This organism is found worldwide in almost all the countries particularly in perennials in tropical regions.
- 5. History • Colletotrichum gleosporioides was first isolated from Trinidad and Mexico. • Butler (1918) reported colletotrichum gleosporioides for the first time in India causing leaf spot in coffee.Mc Rae reported it as causitive agent for mango anthracnose.
- 6. Host • Citrus, yam, papaya, avocado, coffee, eggplant, sweet pepper and tomato.
- 7. Favourable conditions • High temperature and high humidity are favourable for the growth of the pathogen. • Germination of the spores require high humidity. • when the moisture content is high acervuli is able to release spores. • The fungus is not active during dry weather.
- 8. Symptoms • Small , regular to irregular black spots on leaves, calyx region and fruits which turn later on as dark brown depressed spots. • Infected leaves turn yellow and drop off.
- 10. ©plantix.net
- 11. Mode of spread •Primary spread : Infected leaves •Secondary spread :Wind borne conidia
- 13. Chemical management • Carbendazim /Difenconaole or Thiophanate methyl @ 0.1%. • Chlorothalonil 0.2% spray at forty night intervals. • Spraying of Prochloraz 45 EC @ 0.75ml/lit were effective against anthracnose.
- 14. Biological management • Known biocontrol agents are competitive fungi Aspergillus flavus, Hypocrea rufa, Hyponectria tuberculariformis and Nectriella muelleri.
- 15. References • H.W. Anderson, “Diseases of Fruit Crops “, 2nd edition, J.V Publishing house. Pg (172 – 173) • T.S. Thind , “Diseases of Fruit and Vegetabes and their Management, Kalyani Publishers.Pg(26 – 30) • www.agriportal.com