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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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