Effect of suneem oil on the biological aspects of spodoptera littoralis [boisd] with reference to the histopathological changes of the larval midgut

ABSTRACT

Suneem oil was assessed against the Egyptian cotton leaf worm, Spodoptera littoralis to clarify its possible action on biology, food metabolism and histopathological changes on the mid gut epithelium layer of the 5[th] larval instar. Two concentrations of suneem oil were used [1000 and 100 ppm]. The results showed that all estimated metabolic parameters were less than those of control. Biological parameters [larval duration, pupal duration,% emergency, fecundity, and hatchability] were also affected by the treatment. The histopathological changes cleared hypertrophy of epithelial cells, vacuolation of cell cytoplasm and fat body, destruction of microvilli, and disappearance of pretrophic membrane