Sensitive developmental period of last-instar German cockroaches (Dictyoptera: Blattelidae) to fenoxycarb and hydroprene.
The sensitive developmental period of last-instar German cockroaches, Blattella germanica (L.), to topical applications (10 micrograms/microliters) of fenoxycarb and hydroprene was determined. Developmental duration of last instars treated with fenoxycarb on days 1, 3, or 6 was 9-11 d longer than the development of nymphs treated with hydroprene or acetone. In addition, fenoxycarb caused mortality in 59% of the nymphs treated on day 6. A high level of wing twisting and sterility was observed among female and male cockroaches treated with fenoxycarb or hydroprene on days 1, 3, or 6 of the last stadium. Nymphal production by adults treated with juvenoids on day 9 of the last stadium (3-4 d before eclosion) was not affected. Our findings show that the sensitive developmental period for juvenoid-induced effects in last-instar B. germanica is limited to the first half of the stadium.
Center for Urban and Industrial Pest Management, Purdue University, West Lafayette, Indiana 47907.
J E
JE
King
G W
GW
Bennett
D000818:Animals; D002219:Carbamates; D003058:Cockroaches; D005231:Fatty Acids, Unsaturated; D005260:Female; D007306:Insecticides; D007605:Juvenile Hormones; D008297:Male; D009758:Nymph; D048448:Phenylcarbamates
D002219:Carbamates; D005231:Fatty Acids, Unsaturated; D007306:Insecticides; D007605:Juvenile Hormones; D048448:Phenylcarbamates; C006481:ethyl-3,7,11-trimethyl-2,4-dodecadienoate; C052034:fenoxycarb