Comparison of the Insecticidal Effect of Several Compounds on Biological Parameters of Trichogramma brassicae

In this study, the immature stages of T. brassicae (Hym.: Trichogrammatidae) were exposed to the recommended field concentration and half of the recommended field concentration of four insecticides abamectin, emamectin benzoate, acetamipride, and flubendiamide.  The dipping method was carried out for the treatment of immature stages. The percentage decrease in emergence, rate of parasitism, longevity and sex ratio were determined. The results show that these concentrations of abamectin, emamectin benzoate, acetamipride and flubendiamide, especially the recommended field concentrations, affected the biological parameters of the wasp compared with the control. In the flubendiamide treatment with the recommended field concentration the percentage emergence of F0 and F1 larval, prepupal and pupal stages were (69.58±1.07, 81.67±2.15 and 78.75±2.20) (70.33±2.78, 80.25±3.57 and 88.45±3.60) and were classified in class 1 respectively and abamectin with percentage emergence of F0 and F1 (44.58±1.34, 49.58±1.19 and 40.00±3.02) (44.72±1.97, 42.35±7.28 and 48.76±2.87) were classified in class 2 in all the stages. Emamectin benzoate and acetamipride were also classified in some stages as class 1 and in the other stages as class 2. Furthermore, the most and the least side effects of other parameters of the pesticides were related to abamectin and flubendiamide, respectively. The results reveal that flubendiamide could be recommended for the control of butterfly pests in IPM programs due to lower toxicity to natural enemies.