Abstract

Bioassay studies were carried out in the laboratory to determine the relative toxicity of Chloropyriphos.endosulphan, acetone and alcoholic leaf extracts of Argemone mexicana, Parthenium hysterophorusand Nicotiana plumbigenifolia against adult beetle of Raphidopalpafoveicollis. Based on the LC₅₀ value ofinsecticides and taking the acetone leaf extract ofP.hysterophorusas a unity, the relative toxicity of chloropyriphos, endosulphan, acetone and alcoholic leaf extract of A. mexicana, P. hysterophorus and N. plumbigenifolia was 7.40, 6.72, 1.23, 2.0, 1.0, 1.34, 0.98 and 1.09 respectively.

The synthetic pesticides chloropyriphosand endosulphanwere found to be most toxic as compared to plant products. However, A. mexicana were the were the most toxic among all the three plants used for the successful control of R. foveicollis.

Keywords: Synthetic pesticides, Plant extracts, Relative toxicity, Raphidopalpafoveicollis.

Jolly Singh And Neeraj Kumar

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