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Memórias do Instituto Oswaldo Cruz

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Abstract

JURBERG, José et al. Morphogenetic effects of precocene II on nymphs of Rhodnius prolixus (Stal, 1859) (Hemiptera - Triatominae). Mem. Inst. Oswaldo Cruz [online]. 1984, vol.79, n.4, pp. 397-407. ISSN 0074-0276.  http://dx.doi.org/10.1590/S0074-02761984000400001.

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.

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