Biological Control of the Alfalfa Weevil in Massachusetts1

Studies of Hypera postica (Gyllenhal) larval populations in Hampshire County from 1965 through 1968 for parasite activity revealed increases in the duration and magnitude of parasitism by Balhyplecles curculionis (Thomson) and decreases by Tetrastichus incertus (Ratzeburg). Neither parasite, either singly or in combination, appears capable of preventing damage. Similar results were found in other Massachusetts counties.