Abstract

EVALUATION OF INSECTICIDAL ACTIVITY FOR ANNONA SQUAMOSA L. BARK METHANOLIC EXTRACT AGAINST THE LUCILIA SERICATA AND SITOPHILUS GRANARIUS PESTS

*Nimbekar T.P., Wanjari B. E., Patil A.T.

Abstract

The use of insecticides of natural origin are therefore an important development in pest control as they have short residual action, low mammalian toxicity and reduced environmental pollution. The results exhibit the toxicity of Annona bark extracts against Lucilia sericata and Sitophilus granarius, respectively. The treatment of different concentrations of the bark extracts of plant with both pests exhibited relatively lower percent mortality after shorter duration (24h) than that at longer duration (48h). The methanol extract of A. squamosa was found to be quite effective against Lucilia sericata and Sitophilus granarius adults as nearly 100% mortality was observed at 600ppm. The LC50 values of A. squamosa extracts for Lucilia sericata flies was calculated to be 240 ppm and for Sitophilus granarius was calculated to be 280 ppm. The toxic effects of methanolic extract of A. squamosa was evaluated against Lucilia sericata and Sitophilus granaries by using the method of residual film technique. The results showed that the extract of A. squamosa at 200 μg/cm2 possessed the lowest toxicity of 63.33% whereas at 1000 μg/cm2 showed the highest toxicity of 93% in case of Lucilia sericata. The same mortality rate was found in case of Sitophilus granaries at concentrations 200 μg/cm2 and 1000 μg/cm2 i.e. 60% and 90% respectively.

Keywords: Annona squamosa, Sitophilus granarius, Lucilia sericata.