Trends in Biosciences

The present studies entitled “Biorational management of sucking pests of cowpea Vigna sinensis L.” was undertaken on farm of Entomology Section, College of Agriculture, Nagpur during kharif season of 2012–2013. The experiment was laid out in Randomized Block Design (RBD) with eight treatments and three replications. The results in respect of overall cumulative mean per cent reduction of aphids, thrips and jassids after four applications of treatments at different time interval (i.e. 3^rd, 7^th and 10^th) revealed that the insecticide treatment imidacloprid 17.8 SL 0.005% proved to be superior over all the treatments shown 76.83 per cent, 76.37 per cent, 73.44 per cent respectively. The next effective treatments in case of aphid were dimethoate 30 EC 0.003% and difenthiuron 50 WP recorded 75.29 and 73.95 per cent reduction followed by neem oil 1%, karanj oil 1% and NSE 5%, Verticillium lecanii 2×10⁹cfu/ml 4g shown 64.84, 58.74 and 57.57, 54.35 per cent reduction of aphids population, respectively. Next effective treatments in case of thrips were dimethoate 30 EC 0.003% and difenthiuron 50 WP recorded 75.07 and 72.63 per cent reduction followed by neem oil 1%, karanj oil 1% and NSE 5%, Verticillium lecanii 2×10⁹cfu/ml 4g had shown 59.60, 57.25 and 54.91, 46.61 per cent reduction of thrips population, respectively. Next effective treatment in case of jassids were dimethoate 30 EC0.003% and difenthiuron 50 WP recorded 71.65 and 70.08 per cent reduction respectively followed by neem oil 1%, karanj oil 1% and NSE 5%, Verticillium lecanii 2×10⁹cfu/ml 4g and had shown 57.89, 53.81 and 50.95, 41.83 per cent reduction of jassids population, respectively.