Toxicological and Physiological Impacts of Some Insecticides on the Cotton Leafworm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

Document Type : Original Article

Authors

Department of Cotton Leafworm Research, Plant Protection Research Institute, Agricultural Research Center, Dokki, Giza, P.O.Box 12611, Egypt.

Abstract

The cotton leafworm, Spodoptera littoralis (Boisd.) is a serious pest of cotton and other crops in Egypt. Bioassay was carried out to evaluate the toxicity of some biochemical insecticides (emamectin benzoate, spinosad, and Bacillus thuringiensis)against  2nd larval instar of S. littoralis (Boisd).The LC50 values determined for emamectin benzoate, spinosad, and Bacillus thuringiensis against S. littoralis larvae were 1.38, 114.09, and 54.19 ppm respectively. Based on the LC50 values, emamectin benzoate was more toxic to S. littoralis than the other compounds. Biochemical studies were done to detect the effect of tested compounds on total carbohydrates, proteins, lipids, amylase, invertase, trehalase, and alpha and beta-esterase enzymes. The total results indicated that carbohydrates, total proteins, and lipids were decreased significantly after treatment with Bacillus thuringiensis than the other compounds. The tested insecticides significantly reduced the amylase, invertase, and trehalase activity. A significant increase in alpha and beta esterase was induced by all tested compounds.

Keywords

Journal of Plant Protection and Pathology
Volume 15, Issue 10
October 2024
Pages 355-358

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