Effect of frequency and time intervention of insecticides on pink bollworm (Pectinophora gossypiella) management in Bt cotton
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Authors
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RAKHESH S
University of Agricultural Sciences, Raichur, Karnataka 584 104, India
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SHIVANAND G HANCHINAL
University of Agricultural Sciences, Raichur, Karnataka 584 104, India
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NIDAGUNDI J M
University of Agricultural Sciences, Raichur, Karnataka 584 104, India
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VIJAYKUMAR M Y
University of Agricultural Sciences, Raichur, Karnataka 584 104, India
Keywords:
Economic threshold level, Frequency, Green boll damage, Insecticides, Larval incidenceAbstract
The present study was carried out to investigate the frequency and time intervention of different insecticide against pink bollworm (PBW) in Bt cotton crops during 2020–21 and 2021–22 at University Agricultural Sciences, Raichur, Karnataka. The experiment was laid in randomised block design (RBD) in four replications having 10 treatments. The Bt cotton hybrid ‘Jadoo (KCH-14K59)’ was used for the study. Pooled data of both the seasons resulted in lowest PBW larval incidence, green boll damage, bad opened bolls, locule damage and highest good opened bolls was documented in the treatment, T1 i.e. four sprays, viz. profenofos 50 ec, chlorantraniliprole 18.50 sc, emamectin benzoate 5 sg and bifenthrin 10 ec at 65, 80, 95 and 110 DAS), respectively which showed on par with the treatment, T9 and treatment, T5. Similarly, highest cotton yield and benefit-cost ratio was obtained from the treatment, T1 which was on par with the treatment, T9 and T5. This highlights effective strategic use of insecticides with varied mode of action, particularly, by following ETL-based sprays or administering four sprays at 15 days interval starting from 65 DAS, can efficiently control PBW infestation. This strategic method of application of insecticides at a particular frequency with time interval boosts seed cotton production by reducing PBW incidence and its damage to Bt cotton with increased economic returns, emphasising its practical viability for cotton cultivation.
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