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BACKGROUND:Recent studies have indicated that spinosad, amixture oftwotetracyclic macrolide compoundsproduced during the fermentation of a soil actinomycete, may be suitable for controlling a number of medically important mosquito species, including the dengue vector, Aedesaegypti L. The authors determined the effects of a 1 h exposure to a50% lethal concentration (LC50) of spinosad in the larval stage on the wing length, longevity and reproductive capacity of the adult survivors. Inglés

RESULTS: The LC50 of spinosad for a wild-caught population of Ae. aegypti from Chiapas, southern Mexico, was estimated to be 0.06 mg AI L−1 in late third instars. Paradoxically, the female survivors of exposure to this concentration were significantly larger (as determined by wing length) laid more eggs, but were slightly less fertile than control females. This was probably due to elimination of the smaller and more susceptible fraction of mosquito larvae from the experimental population following spinosad treatment. Male survivors, in contrast, were significantly smaller than controls. No significant differences were detected in the adult longevity of treated and control insects of either sex. Inglés