Powdery mildew of green gram (dhanendra kumar)
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Powdery mildew is a widespread fungal disease of green gram caused by Erysiphe polygoni. The disease produces small, irregular white powdery spots on the upper leaf surface that eventually spread to the lower surface. In severe cases, the entire leaf is covered with white powder. This causes leaves to yellow and drop off. The disease is most severe during flowering and pod development, eventually covering the pods. Infected plants have a grayish-white appearance with malformed, small pods containing few seeds. The fungus lives on and infects the surface of leaves, sending feeding structures into cells. It overwinters in black fruiting bodies on debris from infected plants. Warm, humid conditions favor disease spread primarily through air
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Punjab and M.P.The exact cause of the disease is still not fully understood but the pathogens viz. Fusarium oxysporum f. sp. psidii (Prasad, Mehta & Lal), Rhizoctonia spp. (Taub.) and various pathogens are reported by different workers may be the incitant of the disease.
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This content discuss different disease of major crops their pathogen name, symptoms and their control measure.
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the write down slide preparation of major disease of banana as like fusarium wilt, moko disease and bunchy top of virus etc
Diseases of cotton
Diseases of cotton -
1. Root rot
2. Wilt
3. Anthracnose
4. Black arm
5. Dahiya diseases or Grey mildew
6. Leaf curl
7. 2-4-D injury
BLAST OF FINGER MILLET
This document discusses two diseases that affect ragi (finger millet): blast and smut. Blast, caused by the fungus Pyricularia grisea, is the most important disease and can cause up to 90% yield loss. It affects leaves, stems, and earheads, producing lesions. Smut, caused by Melanopsichium eleusinis, has minor economic impact and transforms grains into black galls. Both diseases are spread through spores and favored by warm, humid conditions. Management includes crop rotation, removing debris, treating seeds, growing resistant varieties, and fungicide application.
lec15.pdf
This document provides information on several common diseases that affect beans:
- Anthracnose, caused by the fungus Colletotrichum lindemuthianum, causes black lesions on bean pods and stems. It thrives in cool, wet weather.
- Root rots caused by fungi like Rhizoctonia solani and Pythium attack young seedlings and roots, stunting plant growth. Proper soil drainage and rotation helps manage these diseases.
- Bacterial blights like common blight and halo blight, caused by Xanthomonas campestris and Pseudomonas syringae respectively, form leaf spots and stem lesions during warm and cool weather respectively. They are managed by using
Diseases of Lentil
This document summarizes two common lentil crop diseases: rust caused by the fungus Uromyces viciae-fabae, and wilt caused by Fusarium oxysporum f.sp. lentis. Rust symptoms include yellowish-white and brown pustules on leaves, stems and pods that can cause premature drying. It spreads via wind-borne spores and is managed with fungicide application and resistant varieties. Wilt symptoms include sudden wilting and drooping of leaves and stems. It is soil-borne and spreads through irrigation water and machinery. Management includes crop rotation, resistant varieties, seed treatment and soil amendments.
4 b chapter diseases of mulberry and their management
This document summarizes common diseases that affect mulberry plants, including fungal, bacterial, viral and nematode diseases. It describes the symptoms, factors that promote spread, and control methods for each disease. Key diseases discussed are leaf spot, powdery mildew, rust, root knot caused by nematodes, and deficiencies of nitrogen, phosphorus, potassium and other nutrients. Control involves removing infected plant material, spraying fungicides or bactericides, applying fertilizers to address deficiencies, and cultural practices like wider spacing.
Diseases of guavaa
This document summarizes several diseases that affect guava plants, including Fusarium wilt caused by the fungus Fusarium oxysporum, fruit canker caused by Pestalotiopsis psidii, stem canker caused by Physalospora psidii, anthracnose caused by Gloeosporium psidii, and red rust caused by Cephaleuros virescens. It describes the symptoms, characteristics, and management of each disease.
Presentation (1).pptx Disease of gram and it's
This document summarizes three diseases that affect gram crops:
1. Ascochyta blight, caused by the fungus Ascochyta rabiei, which appears as brown leaf spots and causes blighting. It is seed-borne and spreads during wet weather. Management includes crop rotation, seed treatment, and fungicide application.
2. Grey mold or Botrytis blight caused by the fungus Botrytis cinerea. It causes water-soaked lesions and spots during cool, wet conditions. It overwinters in plant debris. Management focuses on sanitation and spacing plants for air flow.
3. Wilt caused by the fungus Fusarium oxysporum, which blocks the
Mango diseases
This document summarizes several diseases that affect mango plants: anthracnose, powdery mildew, malformation, stem end rot, red rust, and sooty mold. It describes the symptoms, causal pathogens, disease cycles, and management strategies for each disease. Key management strategies include pruning diseased plant parts, using disease-free planting materials, spraying fungicides like carbendazim and copper oxychloride, and controlling insect populations to prevent sooty mold. The document provides detailed information on identifying and addressing important mango diseases.
Diseases of cotton
The document provides information on diseases that affect cotton plants (Gossypium spp.), including bacterial blight, fusarium wilt, verticillium wilt, and root rot. It describes the symptoms, causal pathogens, disease cycles, and favorable conditions for each disease. Management strategies are also outlined, such as using resistant varieties, seed treatment, crop rotation, removing debris, and adjusting sowing times. The overall objective is to familiarize the reader with common cotton diseases and their control.
powdery mildew of mango.pptx
Powdery mildew is a serious fungal disease of mango caused by Oidium mangiferae. It affects young tissue of leaves, flowers, and fruits. Symptoms include gray leaf lesions, curled leaves, cracked and misshapen fruits. Flowers become infected 3-5 weeks after bud break. Inflorescences become completely covered. The fungus overwinters in dormant buds and infected leaves. Spores are wind-dispersed to nearby plants. Warm temperatures and humidity promote initial infection, while cool dry conditions allow disease development. Management includes fungicide application and cultural controls like pruning and removal of infected plant parts.
sorghum.pptx
This document summarizes the symptoms, disease cycle, and management of Ergot or Sugary disease of sorghum. The key points are:
1) Symptoms include secretion of honeydew from infected florets which attracts insects helping spread the disease. Under favorable conditions, grain is replaced by cream-colored sclerotia.
2) The disease cycle involves primary infection from sclerotia producing ascospores and secondary spread via airborne and insect-borne conidia.
3) Management strategies include adjusting sowing dates to avoid flowering in wet periods, growing resistant varieties, and fungicide application.
Diseases of Bhindi
This document summarizes several diseases that affect okra/bhindi crops:
Fusarium wilt causes yellowing, stunting and wilting of plants. It is caused by the fungus Fusarium oxysporum f.sp. vasinfectum.
Cercospora leaf spot causes leaf spots and defoliation. It is caused by three Cercospora species which produce distinct symptoms.
Powdery mildew causes white, powdery patches on leaves which yellow and drop. It is caused by the fungus Erysiphe cichoracearum.
Yellow vein mosaic causes yellow veining and thickening of leaves. It is caused by the
Similar to Powdery mildew of green gram (dhanendra kumar) (20)
Study on major diseases of major crops in Bangladesh
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Powdery mildew of green gram (dhanendra kumar)
- 1. POWDERY MILDEW OF GREEN GRAM SBUMITED BY DHANENDRA DHANUKA Classification:- Kingdom - Mycetae Division - Eumycota Class - Hemiascomycetes Order - Erysyphales Family - Erysyphaceae Genus - Erysiphe species - Polygoni
- 2. • Economics Importance:- Powdery mildew is one of the wide spread disease of several legumes including green gram.
- 3. Symptoms:- Small,irregular powdery spots appear on the upper surface of the leaves. These spots gradually increase in size and become circular covering the lower surface also. When the infection is severe,both surfaces of the leaf are completely covered by whitish powdery growth.
- 4. In severe infection, foliage becomes yellow c defoliation. The disease become severe during flowering development stage. The white powdery spots completely cover th and even the pods. The plant assumes grayish white appearance Often pods are malformed and small with few The disease causes forced maturity of infecte results in heavy yield losses.
- 7. Pathogen:- The fungus is ectophytic, spreading on the surface of the leaf , sending haustoria into the epidermal cells . Conidiophores arise vertically from the leaf surface ,bearing conidia in short chains . Conidia are hyline, thin walled elliptical or barrel shaped cylindrical and singal celled. Latter in the season, cleistothecia appear as minute, black, globose structures with myceloid appendages. Each cleistothecium contains 4-8 asci and each ascus contains 3-8 ascospore which are elliptical, hyaline and singal celled.
- 8. Disease cycle:- The fungus is an obligate parasite and survive as cleistothecia in the infected plant debris. Primary infection is usually from ascospores from perennating cleistothecia . The secondry spread carried out by the air –borne conidia.rain splash also helps in the spread of the disease.
- 9. Favourable conditions:- Warm humid weather favours disease developed.the disease is severe generally during late kharif and rabi season.
- 10. Managenet:- Remove and destroy infected plant debris. Sowing of seed selection of disease free area. Sowing of certified seed. early sowing and use of early maturity variety. Spray twice with carbendazim or thaophanate methyl @0.1% one immediately after disease appearance and the second after 15 days. Use of resistant variety like PRAGYA,PUSA-105