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Insecticide susceptibility status of P. papatasi to organochlorine, organophosphate and carbamate compounds has been estimated in pall and Barmer districts of Rajasthan. Tests revealed that this species was resistant to DDT but susceptible to dieldrin, malathion, fenitrothion and propoxur. Efficacies to these compounds at 50 and 95 per cent levels have been estimated by probit-analysis. The LC(50) values for both DDT and dieldrin, were found much lower than those reported from other parts of the country. Heterogeneity of the response was found highly significant chi(2)=43.8(3) in case of propoxur only.