Study of the sublethal effects of pesticide residues on predatory thrips is important for the design of integrated pest management programmes with biocontrol elements included. We estimated the sublethal effects of three concentrations of fenpropathrin and abamectin (LC10, LC20 and LC30) on prey consumption rates of exposed females of Scolothrips longicornis Priesner and their offspring when fed on Tetranychus urticae Koch eggs. Prey consumption of female thrips was significantly affected by treatment with all concentrations of the two pesticides with the effect of fenpropathrin being more severe than that of abamectin. Regarding the offspring of treated females, the prey consumption by thrips larvae was adversely affected by both pesticide treatments with no major differences between the two pesticides. The sublethal effects of these pesticides should be taken into account in the planning of integrated management programmes.
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Vol. 20 • No. 4