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In garlic and onion crops, this disease is caused by a fungus called Peronospora destructor.
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The symptoms of this disease can be easily seen in the morning when the dew has frozen on the leaves.
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The hallmark of this disease is a purple hairy growth on the surface of leaves and seed stalks.
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The plant remains dwarfed due to the outbreak of this disease.
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The leaves become light green. Gradually the leaves turn from pale yellow to dark brown and dry up.
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Tubers infected with diseased plants are small in size and their storage period is also reduced.
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To manage this disease, spray Azoxystrobin 23% SC @ 200 ml/acre or Azoxystrobin 11% + Tebuconazole 18.3% SC @ 300 ml/acre.
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