To study the antifeedant activity of Nimbicidine and Ultineem against IInd Instar larvae of Spilosoma obliqua (Walker) (Lepidoptera: Arctiidae)
Dinesh Kumar Bhardwaj, Sunita Kumari
The neem based biocides contains promisingrnpest-control substances found effective against many economically importantrnpests and safe environment. These biocides are ecofriendly and do not interferernwith the parasite-predator of this pest. Amongst various method used tornevaluate antifeedant activity of neem formulation, treated larvae fed onrntreated leaves showed maximum antifeedant activity 8.01% and 15.81% foodrnconsumption on concentration 0.8% of Ultineem (azadirachtin 1%) and Nimbicidinern(azadirachtin 0.03%) respectively. Azadirachtin 1% was most effective followedrnby azadirachtin .03%. Amongst various concentration 0.8% was most promisingrnfollowed by 0.4% in case of both formulations. Thus the present studies alsornshow that the antifeedant activity decreased with the decrease in thernconcentration of the compound. The trend of effectiveness of neem pesticidesrnwas azadirachtin 1% › .03%. Second instar larvae were most responsive.rnAzadirachtin 1%, azadirachtin 0.03% @ 0.4 to 0.8% were best treatments to checkrnthe population of S. obliqua.