بررسی اثرات کشندگی سه حشره کش ایمیداکلوپرید، دلتامترین+تیاکلوپرید و فلامتوکویین بر سن شکارگر Orius niger

Orius niger (Wolff) (Hem.: Anthocoridae) is an important predator of economic pests such as thrips, mites and aphids and plays a significant role in the biological control of these pests in greenhouses. In this study, the lethal effects of three insecticides, imidacloprid, proteus and flametoquine were investigated in laboratory conditions. Based on previous studies, selected insecticides were very effective in controlling onion thrips ( Thrips tabaci). The lethal toxicity bioassays were carried out in laboratory conditions at 26 ± 1 °C, 75 %± 10% R.H and a photoperiod of 16:8 h (L:D) on 7-days-old adult insects. Bioassay tests on flamtoquine were excluded from the assays because its field recommended concentration did not have a considerable lethal effect on predator. The calculated LC50 and LC90 values for imidacloprid insecticide were 13.13 and 19.68 ppm and for Proteus 47.39 and 2606 ppm, respectively. The field recommended concentartion of flametoquine was 1000 ppm against the thrips. The result showed that the field recommended rate of flametoquine caused just 20 % mortality on the predator. It seems that this insecticide is safe against the predator. The comparison of the toxicity of imidacloprid and proteus insecticides indicated that imidacloprid insecticide was more toxic than proteus and it would be better to use flamtoquine and proteus for controlling of pests such as thrips in fields to conserve natural predators. It should be noted that the data and results were obtained from laboratory tests andthe applicable study should be done in field conditions.