Biochemical and Physiological Effects of Lufenuron and Chlorfluazuron on Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

Toxicity and effects of lufenuron and chlorfluazuron on some biochemical and physiological parameters of Spocloptera littoralis (Boisd.) larvae were assessed. Changes in the differential haemocyte population during lufenuron and chlorfluazuron treatments have been assessed. The percentage of Prohaemocytes (Pr) markedly decreased after treatment with both insecticides when compared with control but no significant difference was observed between different concentrations of tested insecticides. Moreover, the percentage of Granulocytes (Gr) and Plasmatocytes (P1) decreased markedly after treatments. In contrast, Oenocytes (Oe) and Spherulocytes (Sph) increased after 72 h of lufenuron and chlorfluazuron treatment. Also, the Corpora Allata (CA) activity has been observed in S. littoralis treated larvae. Both lufenuron and chlorfluazuron decreased the CA surface area after 72 h of treatment compared to control.