author(s)
C Selvaraj, JS Kennedy and M Suganthy

abstract
A laboratory bioassay was conducted to investigate the efficacy of Strychnos nux-vomica extracts on the oviposition deterrent effect on the Diamondback moth, Plutella xylostella fed on cauliflower (Brassica oleracea L. var. botrytis). The extracts from different plant parts viz.,leaves, seeds, stem, bark, root bark and fruit rind of Strychnos nux-vomica, extracted in different solvents viz., ethanol, methanol, hexane, acetone, chloroform was evaluated for deterrence for oviposition on P. xylostella. The results revealed that EC formulations of solvent extracts of S. nux-vomica possessed oviposition deterrence effect and maximum effect of 69.81 per cent was observed in chloroform fruit rind extract 10.00 EC at 2 per cent concentration. Oviposition deterrence of different solvent extracts of S. nux-vomica was in the order of chloroform > hexane > acetone > ethanol > methanol and different plant parts were in the order of fruit rind > root bark > seed > leaf > stem bark.