The susceptibility of the predatory bug, Deraeocoris lutescens Schilling (Rhynchota Miridae), to some common pesticides was investigated in the laboratory. Seven pesticides (abamectin, fenpropathrin, imidacloprid, pirimicarb, spirodiclofen, thiacloprid and penconazole) were assayed for their effects on the predator. These pesticides were tested at a single rate of application corresponding to their maximum recommended label rate. The toxicity of these compounds to eggs, N1 and N5 nymphs and adults of D. lutescens by residual contact was investigated and mortality of the biotests was recorded 24, 48, 72 and 96 hours after treatment. The corrected mortalities of N1 and N5 nymphs and adults were evaluated by the IOBC toxicity rating scale for pesticides. Penconazole and spirodiclofen caused the least mortality on different life stages of the predatory bug. The highest mortality was occurred by fenpropathrin, imidacloprid and thiacloprid. The eggs mortality was highest after exposure to fenpropathrin. Spirodiclofen and penconazole caused the least mortality with 10.4% and 19.1%, respectively. The residue of fenpropathrin, imidacloprid and thiacloprid were harmful to N1 and N5 instars of the predator. In contrast, penconazole and spirodiclofen residues were harmless. Abamectin was slightly harmful to N1 and N5 instars. The residue of pirimicarb was moderately harmful to the N1 instar and it was harmless to the N5 instar and adults of the predator. Fenpropathrin was harmful to adult males and females. In contrast, abamectin, pirimicarb, spirodiclofen and penconazole were harmless to the adults.
کلید واژگان :predatory bug, Deraeocoris lutescens, toxic effects, mortality, pesticides
ارزش ریالی : 600000 ریال
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