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Crop Protection :: Cash Crop :: Pest of Cotton

Leafhopper:  Amrasca (Biguttula biguttula) devastans
               

Symptoms of Damage

  • Downward curling and reddening of leaves.
  • Under severe infestation turn brick red colour.
  • Growth retardation and death of plants.

Identification Characters and Biology

  • Destructive Stage: Nymphs and adults.
  • Eggs: Small, delicate and translucent. Egg period: 5 to 15 days
  • Nymph - Light green, translucent, wingless found between the veins of leaves on the under surface
  • Adult - Green, wedge shaped leafhopper.
Hopper burn Leaf hopper Adult Leaf hopper Nymph

Management

  • ETL: 50 nymphs or adults / 50 leaves
  • Cultivate of hairy (hirsute) varieties of cotton
  • Adopt synchronised sowing.
  • Treat seeds with Beauveria bassiana @ 10 g/kg.
  • Apply nitrogenous fertilizers judiciously.
  • Maintain weed free condition in field .
  • Spray any one of the following insecticides when pest population reaches
    ETL: Imidacloprid 17.8% SL 40 – 50 ml/acre or Azadirachtin 0.03%WSP or Buprofezin 25%SC 400 ml/acre or Diafenthiuron 50%WP 240 g/acre or Thiacloprid 21.7%SC 40-50 ml/acre or Flonicamid 50% WG 60 g/acre or Thiamethoxam 25% WG 40 g/acre.
                                           
          Downward cupping of leaf                                                  Jassid symptoms - third grade



 
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