Powdery mildewCaused by: Erysiphe cruciferarum
Problem Category: Fungal Disease
Symptoms: Small white patches on upper and lower leaf surfaces which may also show purple blotching; patches coalesce to form a dense powdery layer which coats the leaves; leaves become chlorotic and drop from plant
Comments: Disease emergence favored by dry season, moderate temperatures, low humidity and low levels of rainfall
Management: Plant resistant varieties; rotate crops; remove all crop debris after harvest; remove weeds; avoid excessive application of nitrogen fertilizer which encourages powdery mildew growth; powdery mildew can be controled by application of sulfur sprays, dusts or vapors
Control: spray 2 times Cowdung+Asafoetida solution in 10 days interval.