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The effects of azadiraehtin A , given orally, on the reproduction of mature females of Rhodnius prolixus were studied. Azadiraehtin A caused a reduction in oocyte growth and consequently in the egg production in a dose-dependent manner. Eggs layed had no alteration in their viabilities. A significant correlation between these effects and the titers of both vitellogenin in the haemolymph and vitellin in the ovaries was observed. Ecdysteroid titers in haemolymph and ovaries, as determined by radioimmunoassay, were decreased by this treatment. In vitro analysis suggested that azadiraehtin may directly interfere in ovarian ecdysteroid production. The significance of these findings in relation to the mode of action of azadiraehtin is discussed.

Azadirachtin-Induced Sterilization in Mature Females of Rhodnius prolixus