Malathion resistance in red flour beetle (Tribolium castaneum) (Herbst) (Coleoptera: Tenebrionidae) from FCI godowns of Kerala, India

R.P. Anusree, Berin Pathrose, Mani Chellappan


Laboratory studies were conducted during 2018-2019 in the Department of Agricultural Entomology, College of Horticulture, Vellanikkara, Kerala Agricultural University, Thrissur, to evaluate the susceptibility of different populations of Tribolium castaneum Malathion (Herbst) (Coleoptera: Tenebrionidae) collected from five FCI godowns of Kerala viz., Thikkodi, Olavakkode, Mulangunnathukavu, Angamaly and Valiyathura to malathion with respect to the laboratory maintained susceptible strain from IARI, New Delhi. Residual film bioassay was carried out using technical grade malathion. Angamaly population of T. castaneum showed 13.34 fold resistance with the highest LC50 value of 6949.80 ppm, while the IARI strain had the lowest LC50 of 520.76 ppm. Resistance ratios for Mulangunnathukavu, Valiyathura, Olavakkode and Thikkodi population were 11.82, 11.27, 10.99 and 10.95, respectively. Resistance to malathion in all field collected populations were uniform and homogenous.


Tribolium castaneum, insecticide resistance, malathion

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