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Major disease in onion (Purple Blotch) | purple blotch of onion | Diseases of Onion | Krishi Network
3 года назад
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Purple Blotch of Onion and Its Management
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Major disease in onion (Purple Blotch) | purple blotch of onion | Diseases of Onion | Krishi Network
Purple blotch/scald disease: Alternaria porri Symptom: Leaves - whitish minute dots on leaves with irregular chlorotic areas on tip portion Circular to oblong concentric black velvety rings appear in chlorotic area Lesions develop towards the base of the leaves Leaves die from the tip downwards, break at the point of infection and hang down Bulbs – semi watery rot, shrinkage of the fleshy bulb scales and desiccation followed by these scales becoming dry and papery Identification of pathogen: Mycelium - branched, coloured and septate Conidiophores - singly or in groups, septate, pale to mid brown Conidia - solitary, straight or curved Mode of spread and survival: Carried through seed bulbs collected from infected field Spreads mainly through air borne spores Pathogen enters through stomata or wounds Survives in plant debris for 8 months Epidemiology: Temp - 21 to 30oc RH - 90 % Management: Seed treatment - thiram @ 2.5g/kg of seed Three sprays of Copper oxychloride - 0.25%, Chlorothalanil - 0.2% and Zineb - 0.2% Mancozeb - 0.2% Varieties - New Selection, Red Creole - resistant #oniondisease #CropProtaction #KrishiNetwork
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