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Phenology of the alfalfa weevil (Coleoptera: Curculionidae) and its associated parasitoids in Minnesota


, : Phenology of the alfalfa weevil (Coleoptera: Curculionidae) and its associated parasitoids in Minnesota. Journal of Entomological Science 35(3): 227-238

Field surveys were conducted in Minnesota to determine the seasonal incidence of parasitism of alfalfa weevil, Hypera postica (Gyllenhal), by Bathyplectes curculionis (Thomson), B. anurus (Thomson), Oomyzus incertus (Ratzeburg), and Microctonus aethiopoides (Loan). During the 1991-1993 survey, alfalfa weevil population density was typically below that required to cause economic damage. In Minnesota, peak density of alfalfa weevil larvae tended to occur around 300 dd (base 9 degrees C).

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