DEVELOPMENTAL, MORPHOGENETIC AND REPRODUCTIVE EFFECTS OF 4 POLYCYCLICNON-ISOPRENOID JUVENOIDS IN THE GERMAN-COCKROACH (DICTYOPTERA, BLATTELLIDAE)

Developmental, morphogenetic, and reproductive effects of four polycyc lic non-isoprenoid juvenoids (fenoxycarb, pyriproxyfen, CGA45128, and PH030) were compared in nymphal German cockroaches, Blattella germanic a (L.). A pronounced dose-dependent response was exhibited with all ju venoids. Ecdysial failure was induced at 100 and 10 mug by fenoxycarb, CGA45128 and PH030, while pyriproxyfen did not cause this effect at a ny dose tested. All juvenoids induced significant developmental delays (at doses of 100, 10 and 1 mug/insect) and caused high levels of morp hogenetic wing twisting, with PH030 being significantly more active th an the other compounds. Twisted-wing adultoids were capable of reprodu cing unless they had been treated at 100 or 10 mug; PH030 was the only compound causing reproductive inhibition at the lower 1 mug dose. Win g twisting was not an absolute indicator of reproductive inhibition, a s most slightly affected adultoids were capable of producing progeny w hen mated with normal adults. The implications of this latter finding to German cockroach population management with juvenoids is discussed.