Efeitos morfogenicos de precoceno II em ninfas de Rhodnius prolixus (Stal, 1859) (Hemiptera - Triatominae) Morphogenetic effects of precocene II on nymphs of Rhodnius prolixus (Stal, 1859) (Hemiptera - Triatominae)

• Main Authors: José Jurberg, Jane Margaret Costa, Teresa Cristina Monte Gonçalves, Eloi de Souza Garcia, Patricia de Azambuja
• Format: Article
• Language: English
• Published: Instituto Oswaldo Cruz, Ministério da Saúde 1984-12-01
• Series: Memórias do Instituto Oswaldo Cruz.
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02761984000400001

Com o propósito de vir controlar os triatomíneos, vetores da doneça de Chgas, por substâncias não convencionais, analisamos a atuação e os efeitos de Precoceno II por tratamento tópico e oral em ninfas do 1º ao 4º estádio de Rhodnius prolixus. Com enfoque comparativo entre os dois tipos de aplicação, fizemos uma análise de deformações morfológicas externas, principalmente das estruturas genitais externas de ambos os sexos.<br>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 µg/.insect) or adding the drug to the blood meal (25 µg/ml of blood).Adultoids of 4th- and 5th-instar, obtained by both treatments of 3rd- and 4 th-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.