Pesticidal activity of Indigenous plant extracts against brinjal hadda beetle, Henosepilachna vigintioctopunctata (Fab.) (Coccinellidae; Coleoptera)
Thulasi S, S Arivudainambi
An experiment conducted to assess the pesticidal properties of twenty plants recommended by the aboriginal people of Western Ghats of Tamil Nadu were studied by conducting laboratory bioassay against third instar grubs of Henosepilachna vigintioctopunctata (Fab.) (Coccinellidae; Coleoptera). Among the various treatments, increased antifeedant index was noted in Wrightia tinctoria, Andrographis paniculata, Cymbopogon citrates, Glorisa superba, and Justicia gendarussa at five percent concentration. The antifeedancy and repellency indexes were recorded at maximum range of 83.33 to 100 percent respectively. The insect growth regulatory activity was more pronounced in W. tinctoria and A. paniculata at two percent concentration where 83.33 and 91.04 per cent was noted respectively.