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Diseases of Gourds Diseases of Gourds 1.Downy mildew: Pseudoperonospora cubensis Symptoms Symptoms resembling mosaic viz, pale green areas separated by dark green areas appear on upper surface of leaf. During wet season, corresponding lower surface is covered with faint purplish fungal growth. The entire leaf dries up quickly. Pathogen It is an obligate parasite. The mycelium…

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Diseases of Potato Diseases of Potato 1.Late blight of potato: Phytopthora infestans Symptom: It affects leaves, stems and tubers. Water soaked spots appear on leaves, increase in size, turn purple brown& finally black colour White growth develops on under surface of leaves. This spreads to petioles, rachis& stems. It frequently develops at nodes. Stem breaks at…

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Diseases of Asparagus Diseases of Asparagus 1.Crown Rot & Seedling Blight: Fusarium oxysporum f. sp. asparagi   Symptoms Crown rot coupled with winter injury can reduce newly seeded and established asparagus plantings by up to 50% or more in a year. Infected seedlings will exhibit stunting, yellowing and wilting of the foliage as the primary roots…

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Diseases of Carrot Diseases of Carrot 1.Bacterial blight: Xanthomonas campestris pv.carotae Symptoms The bacterium causes irregular brown spot on leaves, dark brown streaks on petioles and a blighting of floral parts. Lesions on foliage begin as small yellow spots. Soon the centre of the spots they become dry and brittle with an irregular halo. Pathogen The…

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Diseases of Turnip Diseases of  Turnip 1.Alternaria Leaf Spot: Alternaria spp. Symptoms The pathogen affects leaves, stem, pods and seeds. Symptoms of the disease first appear on the leaves of seed stem in the form of small, yellowish, slightly raised lesions. Lesions appear later on the stems and seed pods. Infection spreads rapidly during rainy weather, and…

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Diseases of Cauliflower   Diseases of Cauliflower 1.Downy Mildew: Peronospora parasitica Symptoms Downy mildew can cause much of a field of milk white cauliflower curds to develop superficial discolored spots that renders the disease damage heads unmarketable. Pathogen Conidiophores are erect, dichotomously branched; conidia are broadly oval, ellipsoidal and hyaline.  Mode of Spread and Survival The…

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Diseases of Cabbage Diseases of Cabbage 1.Black leg: Phoma lingam   Symptoms It is caused by Phoma lingam and occurs in most regions, specially in areas with rainfall during the growing period. The fungus is carried by the seed and hence it may occur from the early stage. Stem of the affected plant when split vertically,…

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Diseases of Radish Diseases of Radish 1.Alternaria Blight :Alternaria raphani   Symptoms The pathogen affects leaves, stem, pods and seeds. Symptoms of the disease first appear on the leaves of seed stem in the form of small, yellowish, slightly raised lesions. Lesions appear later on the stems and seed pods. Infection spreads rapidly during rainy…

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Diseases of Beet root Diseases of Beet root 1.Leaf Spot: Cercospora beticola Symptoms This is a commonly occurring disease on foliage of beet roots. High humidity usually favours the spread of this disease. Numerous small circular spots appear on the leaf surface. The spots increase in size, becoming brownish or purplish in color. Individual spots are…

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Wheat Diseases Powdery mildew(Wheat Disease) Powdery mildew is caused by Blumeria graminis f. sp. tritici  Disease symptoms(Wheat Disease) Powdery mildew can easily be diagnosed by the white, powdery patches that form on the upper surface of leaves and stem. Greyish white powdery growth appears on the leaf, sheath, stem and floral parts. Powdery growth later become black lesion…