It is caused by the fungus Leveillulataurica. Initially light green to bright yellow spots appear on the upper surface of the leaves. A light powdery covering is visible on the leaves and green leaves turn yellow in colour and rot. For effective control, spray Hexaconazole 5% SC @ 30 ml/ 15 litre water or sulphur 80% WDG @ 50 Gm/15 litre Water.
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