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Effective management of boll worms of cotton




1)American boll worm (Helicoverpa armigera)

Damage

  • Polyphagous pest
  • Feeds on leaves and all fruiting bodies
  • When feeds the body remained outside from the boll

Management

ETL level 5 brown eggs or 3 larvae or both per 25 plants

Non chemical control

  • Use of Trichogramma cards on all non BT crops
  • Clean cultivation done
  • Ploughing of field after the harvest of the crop that kill the larvae and pupae by exposing to sun heat and birds and animals.
  • Avoid early sowing of cotton
  • Monitoring of pest done regularly

Chemical control control

Recommended chemical name with  dose rate

Spinosad 24%SC                            80-100ml/acre

Spinosad 48%SC                             60ml/acre

Emamectin Benzoate 1.9%EC                  200ml/acre

Abamectin 1.8/3.5%                          400/200ml/acre

Profenofos 50%EC                           250ml

  • Army worm(Spodoptera spp.)

Damage

  • Feed on many crops and plants as host plant
  • Feeds on leaves severely and veins left behind just like skeleton
  • Immature falling of bolls occur
  • Mature bolls show bad opening

Management

ETL level on seen by any larvae, egg and adult

Non chemical control

  • Monitor the pest by installing light trap
  • Clean cultivation
  • Collect larvae and egg masses and destroy them
  • Timely irrigation

Chemical control

Recommended chemicals with dose rate

Emamectin Benzoate 1.9%EC                  200ml/acre

Abamectin 1.8/3.5%                          400/200ml/acre

Lufenuron 5%EC                            200ml/acre

Lufenuron 10%EC                            100ml/acre

 

 

 

  • spotted boll worms (Earias insulana ,Earias vitells)

Damage

  • Larvae completely enter into the ball and feed on them
  • Shedding of young bolls and squares and flaring brackets
  • Holes are visible on bolls and excreta visible

Management

ETL level 3 larvae per 25 plants or 10% boll , flower and squares infestation

Non chemical control

  • Clean cultivation
  • Eradication of alternate host
  • Cutting of sticks immediately after the last pick
  • Monitoring of pest regularly with light trap or pheromones trap

Chemical control

Recommended chemicals with dose rate

Spinosad 24%SC                            40ml/acre

Spinosad 48%SC                             20ml/acre

Emamectin Benzoate 1.9%EC                  200ml/acre

Abamectin 1.8/3.5%                          400/200ml/acre

4)Pink boll worm(Pectinophora gossypiella)

Damage

  • Larvae feed on the flowers and buds and flowers become rosette
  • Yellowing of lint unpickable and valueless in severe attack
  • Cause the double seed by joining the two seeds and deteriorate the quality of fiber

Management

ETL level 10% boll infestation in August and 5% in September

Non chemical control

  • Rotavate the cotton field immediately after harvesting
  • Grazing of sheep’s and goats after last picking of cotton
  • Small bundles of sticks if kept for fuel then kept in vertical position and also changed their position from time to time
  • Installation of traps for monitoring the pest population

Chemical control

Recommended chemicals with dose rate

Triazophos 40%EC                           1000ml/acre

Spinetoram 12%SC                           80ml/acre

Triazophos +deltamethrin 36%EC               600ml/acre

 

Written by. Haseeb Jan

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