Abstract
A laboratory bioassay was carried out to determine the LC50 and relative toxicity of three botanicals (leaf extracts) along with a check imidacloprid 17.8 SL and control on the cowpea aphid Aphis craccivora Koch. Extract of Polygonum hydropiper showed the maximum efficacy (LC50-0.341%) followed by Murraya koenigii (0.707%) and Pongamia pinnata (3.357%) after 72 hr exposure. Considering the relative toxicity of imidacloprid as unit value, P. hydropiper, M. koenigii and P. pinnata were 0.090, 0.043 and 0.009x less toxic, respectively.
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