TOXIC EFFECTS OF PYRETHROIDS LAMBDA-CYHALOTHRIN AND ALPHA-CYPERMETHRIN ON PEST ARCHIPS ROSANA (LEPIDOPTERA: TORTRICIDAE) AND ITS COMMON PARASITOID

摘要

In the present study, we aimed to identify the effective concentrations of the insecticides Lambda-cyhalothrin (LCT) and Alpha-cypermethrin (CYP) on different live stages of Archips rosana (Linnaeus, 1758), using their commercial forms, Tekvando 5EC (LCT) and Super Takimethrin 100 EC (CYP), as test substances at the field recommended concentration and at 101, 102, 103,104, 105, 106 fold diluted concentrations of the recommended concentration. We found that the LC50 concentrations of LCT for larvae, adult (24 h) and pupae forms (7 days) were 1.162 μM, 0.919 and 0.012 μM, respectively. The LC50 concentrations of CYP for larvae, adult and pupae forms were 1.937, 1.014 and 0.008 μM,respectively. The concentrations that induced over 85% mortality of pupae, although they did not exert a lethal effect on the common parasitoids that developed in the pupae, were 1.10-1 μM for LCT and 2.10-3 μM for CYP under laboratory conditions. We showed that diluted concentrations of LCT and CYP insecticides still have 80% mortality at the larvae, pupae and adult stages. It is important to study the concentrations that are effective on pests, but not on parasitoids, which are used in biological control. Therefore, this approach may be helpful for integrated pest management programmes.