Bio-efficacy of EC formulations of Strychnos nux-vomica extracts against Plutella xylostella Linn. in 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 were evaluated against P. xylostella. In field condition, it performed more or less similar to the standard check, emamectin benzoate. Maximum reduction of P. xylostella over control (ROC) was recorded in emamectin benzoate 5 SG @ 11 g a.i.ha⁻¹ treated plot (58.79%) followed by treatments hexane seed 4%, hexane leaf 4%, neemazal 1%, hexane seed 3%, hexane seed 2%, hexane leaf 3% and hexane leaf 2% recording 52.97, 52.85, 41.14, 40.37, 38.43, 34.78 and 25.48% respectively.