BIOCHEMICAL IMPACTS OF THREE CHITIN SYNTHESIS INHIBITORS AND THEIR BINARY MIXTURES WITH CHLORPYRIFOS OR BETA-CYFLUTHRIN ON Spodoptera littoralis (BOISD.)

Elgohary, Laila R. A.

doi:10.21608/jppp.2013.87684

BIOCHEMICAL IMPACTS OF THREE CHITIN SYNTHESIS INHIBITORS AND THEIR BINARY MIXTURES WITH CHLORPYRIFOS OR BETA-CYFLUTHRIN ON Spodoptera littoralis (BOISD.)

Document Type : Original Article

Author

Laila R. A. Elgohary

Pesticide Dept., Faculty of Agriculture, Mansoura University, Egypt

10.21608/jppp.2013.87684

Abstract

The joint action of the binary mixtures of chlorpyrifos (organophosphorus) or beta-cyfluthrin (pyrethroid) plus three chitin synthesis inhibitors(flufenoxuron, chlorfluazuron and lufenuron) on the 4^th instar larvae of the laboratory strain of the cotton leafworm Spodoptera littoralis (Boisd.) at LC₂₅ level were evaluated. In general, according to co-toxicity factor data clearly indicated that all tested mixtures decreased the toxicity except for the combination between chlorpyrifos and lufenuron, it produced additive effect (-19.15). The tested mixtures of Beta-cyfluthrin with all tested insect growth regulators (IGRs) were high antagonism (ranging between - 55.56 and - 84.13) than the tested mixtures of IGRs with chlorpyrifos. The effect of both tested individual insecticides and it’s mixtures on the activity of esterases (α- & β-esterase), transaminase (AST and ALT) chitinase, alkaline phosphatase, total proteins, total lipids and glucose was determined colorimetrically.