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Toxicological and Biochemical Studies on the Effect of Lufenuron, a Chitin Synthesis Inhibitor Alone or Combined with Gamma Radiation Against Spodoptera littoralis Larvae

Author:
Abdalla, R. S., Rizk, S. A., El Sayed, T. S., Sayed, R. M.
Source:
Entomological news 2020 v.129 no.1 pp. 71-80
ISSN:
0013-872X
Subject:
Gossypium, Spodoptera littoralis, acetylcholinesterase, chitin, enzyme activity, gamma radiation, insect larvae, instars, irradiation, lethal concentration 50, lufenuron, monophenol monooxygenase, mortality, pupae
Abstract:
This study aimed to investigate the combined effect of lufenuron and gamma radiation against the cotton leaf worm. Full-grown pupae were irradiated with a substerilizing dose 100Gy, and the 4th instar larvae of the F₁ were used in the experiments. The results revealed that the percent mortality was time- and concentration-dependent, and the F₁ larvae were more susceptible to lufenuron than the normal larvae. The enzymatic analysis of phenoloxidase and acetylcholinesterase activities showed that the F₁ larvae treated with LC₅₀ of lufenuron exhibited the highest activity when compared to larvae treated with LC₅₀ of lufenuron or F₁ larvae. We conclude that a combination of gamma radiation and lufenuron could be an excellent integrated control program for Spodoptera littoralis.
Agid:
6809890