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Black sooty mould on upper side of lower leaves.
Secondary symptoms - Crinkling and cupping of leaves; defoliation; square and boll shedding and stunted growth. Honeydew (a sugary liquid)secretion on the upper surface of leaves is observed and sooty mould also develops.Solutions - Imidacloprid 200 SL @ 1 ml/liter of water; Thiamethoxam @ 10 gm/pump or Acetamiprid 20% SP @ 8 gm/pump.
Solutions for this issue