Hymenopterous parasites associated with Phyllonorycter blancardella [Lepidoptera : Gracillariidae] in Nova Scotia and Quebec

Mined leaves were collected in commercial and unsprayed (no insecticides) a pple orchards of Quebec and Nova Scotia to determine the relative abundance and diversity of parasites of the spotted tentiform leafminer, Phyllonoryc ter blancardella [Lepidoptera: Gracillariidae]. In Quebec, 29 species of le afminer parasites were recovered, belonging to 7 families : Aphelinidae, Br aconidae, Chalcidae, Eulophidae, Ichneumonidae, Pteromalidae and Scelionida e. The most prevalent species were Pholetesor ornigis (67%), Sympiesis mary landensis (11%), S. serviceicornis (7%), Pnigalio maculipes (1.5%), Tetrast icus spp. (1.2%), while all other species accounted for < 1.0%. Pholetesor pedias, a braconid released in 1983 at Frelighsburg, Quebec, was not found in the 1984 and 1985 surveys. In Nova Scotia, 19 parasite species were reco vered, belonging to 5 families : Braconidae, Encyrtidae, Eulophidae, Ichneu monidae and Pteromalidae. The most prevalent species were: Pholetesor ornig is (52%), Pnigalio maculipes (14%), Sympiesis serviceicornis (12%), S. mary landensis (9.5%), Sympiesis spp. (5%), Horismenus fraternus (1.8%), Paraleu rocerus sp. (1.3%), Stictopisthus flaviceps (1.1%), while all other species accounted for < 1%. Seven and five species of hyperparasites were recovere d in Nova Scotia and Quebec, respectively. New records for North America fo r the spotted tentiform leafminer as a host are : Sticopisthus bilineatus, S. flaviceps, Euderis sp., Pnigalio epilobii, P. pallipes and Paraleuroceru s bicoloripes.