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That fifty-para paddy field is owned by someone in Vaikom. Kesavan Nair has been cultivating it for the last forty years. Before that, Kesavan Nair’s uncle was its cultivator. Some ten years ago, when paddy prices were as high as five to seven rupees a bushel, rich people from Changanassery and Thiruvalla, had come there […]
DISEASES CAUSAL ORGANISM Root rot Macrophomina phaseolina Powdery mildew Oidium sp. Leaf spots Alternaria sp. Cassava Mosaic Disease (CMD) Cassava mosaic gemini virus (CMG) 1. Root rot – Macrophomina phaseolina Symptom Symptoms include yellowing of foliage, reduced leaf size, and eventual death of the plant due to root rot. The affected tissues show shredding of […]
DISEASES CAUSAL ORGANISM Seedling blight Phytophthora parasitica Rust Melampsora ricini Leaf blight Alternaria ricini Brown leaf spot Cercospora ricinicola Bacterial leaf blight Xanthomonas campestris pv. ricini 1. SEDLING BLIGHT – Phytophthora parasitica Symptoms The disease appears as circular, dull green patch on both the surface of the cotyledonary leaves. Later it spreads and cause rotting. […]
1. WILT – Fusarium oxysporum f.sp. ciceri Symptoms The disease occurs in seedling stage and flowering stage. Infected seedlings show yellowing, drying of leaves, browning of vascular bundles and finally wilting of plants. Mode of Spread and Survival The disease spreads through irrigation water and farm implements. The pathogen survives as chlamydospores in the soil […]
Diseases of oats DISEASES CAUSAL ORGANISM Septoria avenae blotch Phaeosphaeria avenaria f.sp. avenaria Stem and leaf rust Puccinia graminis var. avena Leaf spot Drechslera campanulata Bacterial blight Pseudomonas syringae pv.striafaciens Yellow dwarf Barley yellow dwarf virus 1. Septoria avenae blotch — Phaeosphaeria avenaria f.sp. avenaria Symptoms The fungus infects leaves, sheaths and stem and […]
Important diseases of rice DISEASES CAUSAL ORGANISM FUNGAL DISEASES Blast Pyricularia oryzae Brown spot or Sesame leaf spot Bipolaris oryzae (Helminthosporium oryzae) Sheath blight Rhizoctonia solani Sheath rot Sarocladium oryzae Narrow brown leaf spot Cercospora janseana Stem rot Sclerotium oryzae Foot rot or Bakanae disease Fusarium moniliforme False smut Ustilaginoidea virens Udbatta disease Ephelis oryzae […]