摘要：The present field experiment was conducted to evaluate the efficacy of seven different treatment schedules during rabi season from November to February in 2012-13 and 2013-14, respectively against aphids, namely, Myzus persicae (Sulzer) and Aphis gossypii Glover on potato at Adisaptagram Block Seed Farm, Hooghly, West Bengal. All the treatment schedules were significantly superior over control throughout the experimental period. Among the seven treatment schedules, T1, which received phorate 10 G @ 1.5 kg a. I/ha at planting, followed by spraying of chlorpyriphos 20 EC @ 2.5 ml/lit of water at 40 days after planting (DAP), imidacloprid 17.8 SL @ 1.5 ml/7.5 lit of water at 55 DAP and cartap hydrochloride 50 SP @ 1g/lit of water at 75 DAP was most effective and the aphid population never crossed the economic threshold level i.e. 20 aphids/100 compound leaves which was followed by T2 and T3 than other treatments as well as control (T7). The per cent reduction of aphid population over control was recorded highest in T1 (92.44 – 93.11), which was succeeded by T3 (88.87 – 89.35), T2 (88.46 – 91.30), T5 (85.67 – 87.60), T6 (82.72 – 84.10) and T4 (75.93 – 78.18) respectively. Maximum marketable yield of potato tubers (t/ha) was obtained in T2 (26.28-26.80), followed by T5 (26.25-26.67) than other treatments and it was found minimum in control (14.17-15.69). Cost benefit ratio was found highest in T2 (1:18.43-1:25.99) while it was noted lowest in T6 (1:9.50-1:11.45)
关键词：Potato; Aphids; Insecticidal treatment; Field efficacy; Comparison
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