The potato tuber moth,phthorima opersulella(Zeller) is one of the most important pests of potato in temperate regions such as Iran. Four stages of potato tuber moth(egg, first instar larvae, pupae and adult) were treated with lethal and sublethal concentrationsof Indoxacarband Thiocloprid under laboratory condition at 26±1Cᵒ, 60±5%, RH and a photoperiod of 16:8 (L:D). The LC50values of Inoxacarb and Thiacoloprid on egg, first instar larvae and adult were 144,93 and 307 mg (a.i.)/l and 912,146,366mg (a.i.)/l, respectively. Statistical analysis showed that Indoxacarb had a more ovicide effect on potato tuber moth than Thiacoloprid insecticide. Also sublethal concentration effects(LC30)of the two insecticides and were studied on egg anddemography of the pest. The values of mrwere estimate 0.188, 0.147, 0.17 female/female/ day for control, Indoxacarband Thiocloprid respectively. There was no significant differences between control and Thiocloprid treatments. Although the Pupae stage was treated with higher dose than the recommended in farm no significant effects were observed. According to results, Indoxacarb had more toxicity effects than Thiacoloprid on potato tuber moth than Thiacoloprid and most of life table parameters were affected by the two insecticide compare to control
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