Colonisation in Canada of Collyria calcitrator (Hym. Ichn.), a Parasite of the Wheat-stem Sawfly

Extract

In response to the expressed desire of Mr. Arthur Gibson, Dominion Entomologist, to introduce European parasites to aid in controlling the Western Wheat-stem Sawfly, Cephus cinctus, a shipment of 15,000 wheat stubs containing parasitised Cephus pygmaeus was forwarded to Canada from the Farnham House Laboratory, Farnham Royal, Bucks, England, in the early spring of 1930. This stubble was received at the Dominion Parasite Laboratory, Belleville, Ontario, and was there held in cold storage until reshipped to Western Canada, where the parasite, Collyria calcitrator, was to be liberated.