FIELD EFFICACY OF INSECTICIDES AGAINST MYZUS PERSICAE (SULZER) IN POTATOES
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Authors
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BIPLAB KAHAR
Department of Zoology, Panchakot Mahavidyalaya, Sarbari, Purulia - 723 121, West Bengal
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PALASH MONDAL
Department of Zoology, Panchakot Mahavidyalaya, Sarbari, Purulia - 723 121, West Bengal
Keywords:
Aphids, Benefit-Cost Ratio, Insecticides, Potato, YieldAbstract
During the 2020–2021 and 2021–2022 growing seasons, the efficacy of various insecticidal treatment regimens—T1 (spiromesifen + spiromesifen), T2 (thiamethoxam + thiamethoxam), T3 (thiacloprid + thiacloprid), T4 (imidacloprid + imidacloprid), T5 (cartap hydrochloride + cartap hydrochloride), T6 (chlorpyriphos + chlorpyriphos) and T7 (untreated control)—was evaluated for controlling Myzus persicae (Sulzer) on the potato cultivar Kufri Chandramukhi. Among the seven treatment options, the two foliar sprays of thiamethoxam 25 WG at 125 g a.i./ha—applied first in the third week of January and then 15 days later—and the two foliar sprays of spiromesifen 240 SC at 96 g a.i./ha—applied in the third week of January and repeated 30 days later—proved to be the most effective in reducing aphid populations. The highest marketable potato yield (40.50 t/ha) was achieved in T2 , followed by T1 (38.87 t/ha), while the control (T7 ) recorded the lowest yield (28.66 t/ha). T2 also had the highest benefit-cost ratio (BCR) at 5.87:1, whereas T6 had the lowest at 1.77:1. Among all treatment regimens, T1 and T2 were the most effective in boosting marketable potato yield and reducing aphid incidence compared to other treatments, including the control.
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