Histopathological changes in the testes were tested in normal adult males and those developed from treated one day old of the fifth nymphal instar of the desert locust with (LC₅₀) of Consult and Lufox. Both testes are formed each of numerous testicular follicles containing germ cells in different stages of development. Certain aspects of spermatogenesis in the desert locust S. gregaria are described in this work using light microscop. Spermatogenesis commences by the division of spermatogonia giving spermatocyes which in turn give spermatids. The transformation process of spermtid to sperm involves several morphological reorganization of the cells. The testicular follicles of 5^th nymphal instar with Consult (LC₅₀) showed damage in zones of reduction and transformation and degeneration and necrosis appeared in many spermatids and spermatozoa. However those testicular follicles of males developed from treated 1 day old of 5^th nymphal instarr with Lufox LC₅₀  showed severe degeneration and necrosis of the most spermatogenic stages.