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12 J. C. Guppy, D. G. Harcourt, M. O'c. Guibord and L. S. Thompson
established at the Delaware field plots. These were recolonized in other northeastern
states, where they became established (Hendrickson & Barth 1979, and personal
communication), and imported for release into eastern Canada. A fourth species,
Diglyphus isaea (Walker) (Eulophidae), was shipped to Quebec for release in 1975;
establishment was not successful in either country apparently because it crossed with
native species of Diglyphus and further attempts of establishment were abandoned
(R.M. Hendrickson 1976, personal communication).
Releases and Recoveries D. dryas, C. punclifacies, and M. hortensis are solitary endoparasitoids. The host is
attacked during the larval stage and the parasitoids complete their development during
Table 2
the pupal stage.
All releases in Canada were of adults, laboratory reared in Newark, Delaware, or
field collected there or in other northeastern States by cooperators and shipped to
Canada directly to release points or for distribution through Agriculture Canada,
Research Branch, Biological Control Unit, Research Program Service. Release and
recovery data are given in Table 2. D. dryas, the only species thus far recovered,
Releases and recoveries of parasitoids against the alfalfa blotch leafminer, Agromyza
fronlella (Rondani), in Canada.
Releases
Species and Province Year Number Y car of recovery
Chrysocharis plillctifacies
Prince Edward Island 1978 4
Prince Edward Island 1980 142
Ontario 1980 150
Quebec 1979 249
Quebec 1980 90
DaClIlIsa dryas
Prince Edward Island 1977 68
Prince Edward Island 1978 70
Prince Edward Island 1979 546 1980
Ontario 1979 586 1979
Quebec 1979 16
Quebec 1980 378 1981
Dig/ypllUs isaea
Quebec 1975 900
Miscogasler IlOrlellsis
Prince Edward Island 1978 32
appears to be firmly established in eastern Canada. In eastern Ontario, it was reared
from third generation pupae in the year of release, 1979, and from each generation in
1980 after overwintering successfully in diapausing pupae. It was also collected in
sweepnet samples throughout the growing season in 1980 at Ottawa.