Ecological aspects of a Cosmopolites sordidus (Germar) (Coleoptera: Curculionidae) population in São Miguel do Iguaçu, PR.
DOI:
https://doi.org/10.5433/1679-0359.2006v27n3p333Keywords:
Insecta, Population fluctuation, Integrated management.Abstract
The population dynamics of Cosmopolites sordidus (Germar) was studied in banana crops (cultivar Nanicão) at São Miguel do Iguaçu, PR, using roof-tile-like baits, between June/2003 and May/2004. Adults infected by entomopathogenic fungi were recorded, and predators were also found on the baits. A comparative bioassay was carried out between the Beauveria bassiana isolate obtained from the experiment area and from other regions in Brazil against C. sordidus adults. The population peaks of C. sordidus adults occurred in June and July, a period with mild temperatures and low precipitation. The population of C. sordidus larvae, however, was concentrated in December. The insect predators found in the area were insects of the following orders: Coleoptera (Carabidae), Dermaptera (Forficulidae), Hemiptera (Reduviidae), Hymenoptera (Formicidae), and spiders of the families Ctenidae, Clubionidae, and Lycosidae, with a population peak two months after the pest population peak. A low number of C. sordidus adults infected by B. bassiana was found, with an annual mean of 0.44%. In the laboratory, the B. bassiana isolates were pathogenic to the insects.
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