اثرات کشندگی و زیرکشندگی آفتکش های‌‌ اسپیروتترامات ‌و ‌اسپیرومسیفن بر ‌سن شکارگر Orius laevigatus (Fieber) (Hemiptera: Anthocoridae) در شرایط آزمایشگاهی

The predator bug, Orius laevigatus (Fieber) (Hemiptera: Anthocoridae) is an important biological control agent for several pests, including thrips, aphids, mites, whiteflies, and the eggs and small larvae of Lepidoptera. In this study, the lethal and sublethal effects of the pesticides including spirotetramat (Movento) and spiromsifen (Obron) on the life table parameters of O. laevigatus in the nymphal and adult stages was investigated in laboratory conditions. Insecticide toxicity was determined by immersing leaves in insecticides and exposing them to bugs. To determine the sublethal effects of insecticides, the concentrations that caused 25 and 10% mortality were used, and some parameters of the predator's life table were examined. The results showed that the values of LC50, LC25 and LC10 for spirotetramat were calculated as 0.16, 0.06 and 0.02 mg/L, respectively. In addition, these values for spiromsifen were 0.14, 0.04 and 0.01 mg/L. Also, the results showed that the insecticides used affect the amount of female production, egg production, hatching rate, life span, survival rate and life expectancy of the predator. The gross reproduction rate (GRR) for the control, spirotetramat and spiromsifen pesticides was 16.8±0.03, 9.11±0.31 and 6.47±0.009 eggs during the lifetime of the females, the net fertility rate (R0) was 5.45±0.006, 3.51±0.01 and 2.84±0.005, the finite rate of population increase (λ) was 1.5±0.001, 1.52±0.001 and 1.44±0.001, doubling time (DT) was 1.72±0.003, 1.66±0.002 and 1.91±0.004, the intrinsic rate of population increase (rm) was 0.34006±0.003, 0.34248±0.005 and 0.29984±0.005, respectively, and in all parameters a significant difference was observed between the control and the insecticides. In general, spiromsifen and spirotetramat insecticides affect the oviposition rate, fertility, and lifespan of the predator, O. laevigatus. Among the insecticides, the toxicity of spiromsifen was more than that of spirotetramat. The obtained results can be used for integrated management and control of various pests using the predatory bug, O. laevigatus.