Susceptibility of Laboratory and Field-Collected Cultures of the Confused Flour Beetle and Red Flour Beetle to Malathion and Pyrethrins

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Abstract
Using the topical application method, the relative susceptibility to malathion and pyrethrins of 6 cultures of the confused flour beetle, Tribolium confusum Jacquelin duVal and 11 of the red flour beetle, T. castaneum (Herbst), collected from various flour mills, feed mills, and warehouses in the United States was compared with the susceptibility of laboratory cultures having no history of insecticidal treatment for 10-15 years. The dosage of malathion required to pro-duce an LD50 with T. confusum was 0.8 - 1.3 times and with T. castaneum 0.6 - 6.4 times higher for the field strain than the laboratory strain. The dosage of pyrethrins required to produce an LD50 with T. confusum was 0.7 - 1.3 times and with T. castaneum 0.6 - 5.7 times higher for the field strain than the laboratory strain. No conclusions could be drawn as to whether these differences were natural or induced.

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