Abstract
1) Methoprene was smeared on female's protergum of American cockroach at the first of oothecal formation.
Inhibitory effect of oothecal formation was observed by topical application of methoprene. It was the very same quality as abnormality observed in UV irradiation.
2) Methoprene was absorbed in nymphs of American cockroach at the first instar by contact to a treated filter paper for 24hours and change of nymphs was examined for 15days after treatment. In nymphs treated with methoprene at the early stage of the first instar, ecdysis delated as sama as UV irradiation. Nymphs treated at the latter half of the first instar did not reach complete ecdysis and died as same as UV irradiation. Only in methoprene treatment, a very few of nymphs treated at early half of the first instar, nymphs failed in ecdysis.
3) Methoprene was smeared on adult protergum of German cockroach. Male mortality was higher than that of females as same as UV irradiation.
