Abstract
Acridid grasshopper, Chrotogonus trachypterus Blanchard is known as surface grasshopper and is a most common polyphagous pest occurring throughout year causing significant damage to seedlings of crops and vegetables. Ultrastructural changes in the ovarian follicles of C. trachypterus Blanchard induced by deltamethrin one day after treatment were observed. Orthopteran insects have panoistic ovarioles and each of the paired ovary consists of tubular ovarioles along which are placed the oocytes in linear sequence that reflexes their progressive development. Each ovariole is divided into a terminal filament, germarium and a vitellarium. In the present study electron micrographs of ovarian follicle cells of females treated with deltamethrin showed prominent histopathological changes leading to vacuolization of cytoplasm, degeneration of the cell components of follicular epithelium and most obvious signs were observed of yolk damage and mitochondrial disintegration, when examined by transmission electron microscopy (TEM). The present study indicates a profound effect on reproduction of the pest by deltamethrin, a synthetic pyrethroid and suggests alternative of more hazardous synthetic organic insecticides.
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