“…The degeneration and the decrease of the volüme of ovaries and testes caused by chemosterilants were shown on Blatella germanica (SMITTLE et al, 1966), on Musca domestica (MORGAN, 1967), on Oncopeltus fasciatus (ECONOMOPOULOS, 1971) and on Trichoplucia ni (HENNEBERRY et al, 1972). With the effect of chemosterilant, the vacuolisation of cytoplasm and nucleus, the aggregation of chromatin, the aberation of chromosome and the dififerentiation of celi content of different parts of reproductive organs occured (LANDA Ytnd REZABOVA, 1965;CLINE, 1968;LaCHANCE and LEVER-ICH, 1968;KLASSEN et al, 1969;SANENA andADITYA, 1969, 1974;WILSON and HAYS, 1969;ADDY, 1970;LANDA and MATOLIN, 1971;NATH and SHEIKHER, 1976).…”