author(s)
Thakoor Pavan, Sunil Kumar Ghosh, Nihal R and Nagamandla Ramya Sri

abstract
An experiment was conducted at District seed farm, Bidhan Chandra Krishi Viswavidyalaya, Kalyani, Nadia, West Bengal to perceive the seasonal incidence and bio-efficacy of some newer insecticides against Aphis gossypii in tomato. Results from the population dynamics revealed that the aphid incidence started from 48th standard week (2.50/3leaves) with peak population attained by 7th standard week (12.19/3 leaves). Correlation studies revealed that the aphid population had a significant positive correlation with diurnal and maximum temperature, while significant negative correlation with maximum and minimum relative humidity. The Bio-efficacy results indicated that all the newer insecticide were significantly superior over control. Maximum population reduction were observed in the insecticidal treatment Imidacloprid 30.5 SC @ 160ml/ha (88.73%) and Flonicamid 50 WG @ 300g/ha (88.71%), followed by other insecticides like Clothianidin 50 WDG @ 500g/ha (83.39%), Dimethoate 30 EC @ 1000ml/ha (79.84%), Difenthiuron 50 WP @1000g/ha (79.51%), Dinotefuran 20 SG @500g/ha (76.14%) and Spinosad 45 SC @100ml/ha (63.04%) also gave significant population reduction over control.