Olesicampe benefactor

Hinz, 1969

Olesicampe benefactor is a European ichneumonid introduced to eastern North America as a agent for the larch sawfly (Pristiphora erichsonii), a forest pest. Small numbers (147–388 individuals) were released in Maine, Nova Scotia, and New Brunswick in 1967. The successfully established at multiple sites, surviving two to three winters at several locations. It disperses slowly, which may limit its effectiveness over large areas without multiple release points.

Pronunciation

How to pronounce Olesicampe benefactor: /oˈlɛsɪˌkæmpi bɛnɪˈfæktɔr/

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Habitat

Larch forests; closely associated with stands of larch (Larix spp.), the plant of its prey, the larch sawfly.

Distribution

Native to Europe (documented from Denmark, Norway, Sweden). Introduced and established in North America: Maine (USA), Nova Scotia, and New Brunswick (Canada) following releases in 1967.

Host Associations

Pristiphora erichsonii - primary Larch sawfly; a European introduced to North America that defoliates larch trees

Behavior

Disperses slowly from release sites. Release success appears dependent on ; optimal host density ranges for release have been discussed to maximize production per individual released.

Ecological Role

agent () targeting the larch sawfly, a significant defoliator of larch forests. Serves as a natural enemy introduced to suppress pest in forest .

Human Relevance

Intentionally introduced for of an forest pest. Establishment success demonstrates potential for programs, though slow may require multiple release sites for effective regional control.

Similar Taxa

Other Olesicampe speciesCongeneric of ; precise identification requires examination of morphological details not provided in available sources
Other ichneumonid parasitoids of Pristiphora erichsoniiMultiple have been introduced or naturally associate with the larch sawfly; O. benefactor distinguished by its European origin and specific release history in North America

More Details

Taxonomic status

Catalogue of Life lists Olesicampe benefactor as a synonym of Olesicampe melanogaster (Thomson, 1887). However, it was described and released as a distinct (Hinz, 1969), and literature treats it as the valid name for this European biological control strain.

Release methodology

The 1967 releases were conducted with small founder (147–388 individuals per site). On two release sites, continued survival could not be confirmed because the population collapsed—potentially indicating successful control or alternatively, loss of the due to host scarcity.