بررسی سمیت دو حشره کش دیکلرووس و سی هالوترین روی حشرات کامل شپشه آرد Tribolium confusum (Col: Tenebrionidae)

Confused flour beetle, Tribolium confusum, is one of the main stored pests that cause serious losses to the flours and the other food staffs. Chemical control is the commonplace way to confused flour beetle control, nowadays. Hence, finding of new insecticides is necessary to improve stored pest management. In the present study, effects of two insecticides, dichlorvos (as organophosphte insecticide) and cyhalothrin (as pyrtheriod insecticide), were evaluated on the adult confused flour beetles (Laboratory population in the Lab Entomology, Faculty of Agriculture, University of Birjand). Finalized concentrations were 1500, 844, 474,267, 100, 0 and 1000, 562, 316, 178, 100 and 0 ppm for dichlorvos and cyhalothrin, respectively. At least 20 individual insects were used for every replication. All treatment replicated at least three times. Control treatment considered as using of distilled water. End point of experiment was determined twenty four hours. Polo plus software was used for analyzing and determination of different lethal concentrations (25-75 %). Results showed that lethal concentrations were calculated 200 ppm (LC25), 451 ppm(LC50) and 1017 ppm (LC75) for dichlorvos; and 163 ppm (LC25), 332 ppm (LC50) and 680 ppm (LC75) for cyhalothrin, respectively. Results suggest that cyhalothrin and dichlorvos were more effective against confused four beetles in the lower doses (according to the LD50) in comparison to the other doses that recommended by companies for the other pest. The low persistence of theses insecticides in the environment and more effective in the lower doses can be considered as action reasonable to use from them in the pest management programs.