IMPACT OF CERTAIN INSECT GROWTH REGULATORSON SPODOPTERA LITTORALIS (LEPIDOPTERA: NOCTUIDAE)

This study aims to evaluate the toxic and biochemical effect of certain insect growth regulators (IGRs) namely, lufenuron and hexaflumuron on S. littoralis. Our results indicated that lufenuron was more toxic than hexaflumuron on 4th instar based on LC50 values. In addition, chitinase activity was increased of treated insects during moulting period than control while the chitin content of treated larvae was lower than control during this period. Glycogen level of treated larvae increased than control ones.Moreover, total protein, total lipids and total carbohydrates were significant decreased for lufenuron at 12 hrs post treatments compared with hexaflumuron. In addition to amylase and trehalase were significant decreased in case of hexaflumuron compared with lufenuron. On contrast, both insecticides caused non significant inhibition in lipase and invertase compared with control. Results indicated that lufenuron and hexaflumuron have shown high potentiality against S. littoralis.