FIELD EFFICACY OF PLANT EXTRACTS AGAINST TOMATO FRUIT BORER HELICOVERPA ARMIGERA

Abstract

Field efficacy of botanical insecticides obtained from Acorus calamus (rhizome), Vitex negundo (leaves), Adhatoda vasica (leaves) and Dioscorea deltoidea (tuber) was tested against Helicoverpa armigera (Hüb) on tomato. Amongst the all tested extracts, hexane extract of Acorus calamus caused 48.91% mortality followed by hexane extract of Vitex negundo (42.75%), ethyl acetate extract of Acorus calamus (36.54%) and hexane extract of Adhatoda vasica (36.14%) at 5% concentration. In other tested concentration, a conclusion difference in efficacy was found after 15 days of application. No phytotoxicity symptoms were observed at 5 % concentration of rhizome extract of Acorus calamus. This concentration can be used for the management of Helicoverpa armigera under field conditions.