This is the most important disease of cucumbers, and this disease is caused by a fungus. Usually, its symptoms appear on the upper surface of the leaves. Initially, small yellow or orange spots appear on the leaves, and as the spots enlarge, they become brown with irregular margins. The white or light purple powder appears on the surface of the lower leaves of infected plants. The fruit is not affected by this disease, but it is less sweet in taste.
Control: To control it, grow resistant/tolerant varieties, avoid excessive overhead irrigation and irrigate the field late in the morning to dry leaves faster. If infestation is observed, spray Mirador (Azoxystrobin 23% SC) @ 200 ml per acre or Clutch (Metiram 55% + Pyraclostrobin 5% WG) @ 600 -700 gm per acre.
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