اثر کشندگی حشره‌کش‌های فلوبن‌دی‌آمید و دی‌کلرووس روی سفید بالک گلخانه Trialeurodes vaporariorum در شرایط آزمایشگاهی

Greenhouse whitefly is one of the polyphagous pests that feeds on plant sap in large quantities. This pest also causes the production of honeydew and the transmission of some plant viruses, which are very important in greenhouses. Despite the fact that the use of pesticides is the main approach for the management of whitefly in the greenhouse, the continuous use of pesticides has caused a strong selective pressure on whitefly populations and caused resistance, accelerated resistant population growth, and increased pest fertility. Therefore, it is necessary to use pesticides with different effective points in the life cycle of the pest. Based on this, the lethal effects of contact and digestive insecticides flubendiamide (Takomi)® WG 20% from the family of diamide compounds and dichlorvos (DDVP)® EC 50% from organophosphates group insecticides on the greenhouse whitefly grown on pinto beans (Var. Khomin) were investigated under laboratory conditions. The experiments were conducted in laboratory conditions at: 25±2 °C, 65±5% RH, 16L:8D. The leaf dipping and adult whitefly was used for bioassays. First, in the preliminary test, concentrations of 17.92, 44.8, 112, 280, and 700 µl/L for dichlorvos and concentrations of 20.48, 51.2, 128, 320, and 800 mg/L was used for flubendiamide. SPSS v26.0 was used to analyze the obtained data. Comparison of the average lethality percentage of the treatments was done with Tukey's test at the statistical probability level of 1%. The highest and lowest loss percentages were calculated in dichlorvos as 96.6±1.07% at 700 µl/L and 50±1.2% at 17.92 µl/L, respectively, and in flubendiamide as 90±1.7% at 800 mg/L and 26.6±1.86% at 20.48 mg/L, respectively. In the evaluation of the lethal of the treatments on the adult whitefly, the most lethal effect (LC50) after 24h was estimated in dichlorvos at 68.26 µl/L and flubendiamide at 109.018 mg/L, respectively. Therefore, according to the obtained results, both insecticides showed favorable lethal effects on the adult greenhouse whitefly. Therefore, according to the frequency of spraying in one cropping period, both insecticides are recommended in order to diversify the insecticide basket.