Abstract
A statewide survey of nine alfalfa-producing regions in Illinois was conducted during 1990 and 1991 to determine the distribution and abundance of two parasitoids, Bathyplectes anurus (Thomson) and Bathyplectes curculionis (Thomson), that attack larvae of the alfalfa weevil, Hypera postica (Gyllenhal). Data suggest that B. anurus has displaced B. curculionis in Illinois. B. anurus was more abundant in the western counties of the state than in the eastern counties; however, the abundance of B. curculionis did not vary significantly among different regions of the state. A fungal pathogen, Zoophthora phytonomi (Arthur), was also detected in 12 of the 27 fields sampled and in 11 of 14 counties surveyed. Further research is needed to determine the effect of interactions among these biological agents in the regulation of alfalfa weevil populations in Illinois.
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