Bioefficacy of biological-based insecticides against diamondback moth (Plutella xylostella) on cabbage (Brassica oleracea)

摘要

Studies on the bio-efficacy of some eco-friendly insecticides, viz azadirachtin (NimbecidineReg. 300 ppm @ 2 ml/l), Btk (HaltReg. 55 000 SU @ 1 g/l), Verticillium lecanii (EcocillReg. 108 cfu @ 8x1012 conidia/g) and spinosad (SpintorReg. 45 SC @ 0.33 ml/l) against diamondback moth [Plutella xylostella (L.)] on cabbage were carried at the experimental farm of University, Nauni, Solan (Himachal Pradesh), during the cropping season of 2005-06. The results revealed that overall efficacy of all the insecticides were significantly superior to the control. Spinosad was most effective against P. xylostella which recorded overall mean population of only 0.55 larvae/plant, followed by Btk with 0.70 larvae/plant. However, V. lecanii and azadirachtin were found to be least effective in controlling the target pest. Thus, on the basis of availability of spinosad and Btk, both could be used alternatively with each other for getting desired control of P. xylostella.