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Zinc sulfate (ZnSO4 7 H2O) was toxicologically , biologically, and physiologically evaluated as insect development inhibitor and endocrine disruptors against the fourth instar larvae of the cotton leaf worm, S .littoralis . Zinc sulfate significantly increased both larval and pupal duration and decreased pupal weight and pupation percentages if compared with control. The fecundity and fertility of females resulted from fed larvae in all mating combinations were remarkably decreased , compared with control. Results showed that females were more sensitive to Znic sulfate than males.Ultrastructure changes of the endocrine glands of larvae as detected by (TEM) were discussed. Zinc sulfate may be used as growth disruptor for S . littoralis among other control methods for S.littoralis management.

Zinc Sulfate As a Growth Disruptor for Spodoptera littoralis With Reference to Histological Changes in Larval Endocrine Glands