Abstract
Bathyplectes stenostigma (Thomson), a univoltine parasite of the alfalfa weevil, Hypera postica (Gyllenhal), discovered in Europe in 1961, is apparently native to northern and central Europe and is probably host-specific to the alfalfa weevil. Field studies near Paris and in southern Sweden showed that alfalfa weevil larvae are attacked in sequence through the season by B. anurus (Thomson), B. curculionis (Thomson), and B. stenostigma with minimal competition between these parasite species. Over 98,000 cocoons of B. stenostigma were mass collected in Europe (1961–70) and shipped to the United States for emergence and release. European surveys, collections, and shipments were made at a cost of about $0.06 per cocoon.
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