Histopathological changes in penitrothion azinphos-methyl resistant strains of the Egyptian Cotton Leafworm, Spodoptera littoralis | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 3, Issue 1, June 1991, Pages 89-101 PDF (1.21 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.1991.461560 | ||
| Authors | ||
| Fathia I. Moustafa* ; Saffaa M. Abd-El Rahman; Madiha M. Abd- El Hameed | ||
| Plant Protec. Depart. Fac. of Agric. Alex, University | ||
| Abstract | ||
| Histopathological studies were carried out in the third instar larvae of the Egyptian cotton leafworm, Spodoptera littoralis (Boisd.) of two organophosphate resistant strains, azinphos- methyl and fenitrothion, with resistance ratios of 14 and 17.03-fold, respectively. A laboratory strain was also, studied as a reference one. The tissues studied were cuticle, epithelium cells, muscles surrounding them, fat bodies, and the nerve ganglion. The cuticle thickens and the epithelium cells were more significantly elongated in the two resistant strains than in the susceptible one: muscles were slightly thicker in the two resistant strains, but the difference were not significant. The number of fat bodies was increased significantly in the susceptible strain than in the two resistant strains. The dimension (length & width) of the nerve ganglion was more elongated significantly azinphos methyl resistant strains. It could be suggested that resistant property of organophosphates is correlated with the thickness of some tissues which may decrease either penetration or absorption of the insecticides and hence, reduce amount of the actual toxicant reaching the target | ||
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