An investigation was conducted to assess the bio-efficacy of the newly introduced formulation of an insectgrowth regulator, pyriproxyfen 10 EW against whitefly, Bemisia tabaci (Gennadius) in Bt cotton hybrid, RCH 773. Spraying pyriproxyfen 10 EW @ 125 g ai ha-1 led to a significantly higher seed cotton yield (24.93 and 24.88 q ha-1 during the respective years, 2016 and 2017).The maximum reduction (83.9 and 82.1%) in the whitefly adult population was achieved at 10 days after the second spray during the respective years, 2016 and 2017. Further, the nymphal population was reduced by up to 84.8%, after 10 days of second spray in 2017, and the corresponding figure was 81.0% for the year 2016. Hence, pyriproxyfen 10 EW can be a good product for the effective management of cotton whitefly which should be rotated with other group of insecticides to reduce chance of development of resistance.
Kumar et al. (Sun,) studied this question.
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