[Morphogenetic effects of precocene II on nymphs of Rhodnius prolixus (Stal, 1859) (Hemiptera-Triatominae)].
The morphogenetic effects of Precocene II in nymphs of 1st-, 2nd-, 3rd-, and 4th-instar of Rhodnius prolixus were studied. A high number of insects underwent precocious metamorphosis by topical treatment (10-30 micrograms/insect) or adding the drug to the blood meal (25 micrograms/ml of blood). Adultoids of 4th- and 5th-instar, obtained by both treatments of 3rd- and 4th-instar, respectively, had mainly fully adult abdominal cuticle, ocelli, three segmented tarsi, rudimentary wings containing adult articulation with the thorax and deformed genitalia while adultiforms of 2nd- and 3rd-instar had very slight imaginal morphological characteristics. Topical treatment induced a high mortality in nymphs of 1st-instar and Precocene II given orally produced a high number of adultoids in this instar. The mode of application and the action of Precocene II on different nymphal instars were interpreted.
D000818:Animals; D001578:Benzopyrans / Q000494:pharmacology*; D007300:Insect Control; D007605:Juvenile Hormones / Q000037:antagonists & inhibitors*; D009024:Morphogenesis / Q000187:drug effects; D012239:Rhodnius / Q000187:drug effects*; D014225:Triatominae / Q000187:drug effects*
D001578:Benzopyrans; D007605:Juvenile Hormones; C014163:precocene II
Efeitos morfogênicos de precoceno II em ninfas de Rhodnius prolixus (Stal, 1859) (Hemiptera-Triatominae)