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ESTABLISHMENT OF OLESICAMPE GENICULATAE QUEDNAU AND LIM (HYMENOPTERA: ICHNEUMONIDAE) TO CONTROL THE MOUNTAIN ASH SAWFLY, PRISTIPHORA GENICULATA (HARTIG) (HYMENOPTERA: TENTHREDINIDAE), IN NEWFOUNDLAND

  • R.J. West (a1), P.L. Dixon (a1), F.W. Quednau (a1), K.P. Lim (a1) and K. Hiscock (a1)...

Abstract

Mated female Olesicampe geniculatae Quednau and Lim were released in St. John’s, Newfoundland, to establish a biological control against the mountain ash sawfly, Pristiphora geniculata (Hartig). Two hundred and fifty-nine females were released during 1981–1984 in a field cage constructed over a mountain ash tree and provided with thousands of host larvae; 171 females were released outside the cage in 1984. A second open release of 368 P. geniculata cocoons, obtained as larvae from the field cage and presumably parasitized by O. geniculatae, was made in 1986 at Pasadena in western Newfoundland. Olesicampe geniculatae rapidly established in the St. John’s area where host populations dropped to insignificant levels by 1990. Island-wide monitoring during 1989 and 1990 indicated that O. geniculatae had spread to the west and south coasts, at rates as high as 50 km per year. Effective and persistent suppression of P. geniculata by O. geniculatae is anticipated.

Des femelles fécondées d’Olesicampe geniculatae (Quednau and Lim) ont été mises en liberté à St. John’s (Terre-Neuve) pour servir à la répression biologique de la tenthrède du sorbier, Pristiphora geniculata (Hartig). Entre 1981 et 1984, 259 femelles de la même espèce, introduites sur le terrain dans cage construite autour d’un sorbier, ont été pourvues de milliers de larves hôtes; 171 femelles étaient relâchées de la cage en 1984. Une seconde dissémination dans la nature de 368 cocoons de P. geniculata, prélevés de la cage et vraisemblablement parasités par l’O. geniculatae, a été réalisée à Pasadena, dans l’ouest de Terre-Neuve. L’O. geniculatae s’est rapidement établi dans la région de St. John’s, où les populations hôtes avaient diminué en 1990 à des niveaux négligeables. En 1989 et 1990, un relevé à la grandeur de l’île a indiqué que l’O. geniculatae s’était répandu vers les côtes ouest et sud, à un rapidité atteignant les 50 km par an. On prévoit que le P. geniculata sera supprimé de façon efficace et persistant par l’O. geniculatae.

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References

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Clark, R.C., Clarke, L.J., and Pardy, K.E.. 1974. The Sawflies and Horntails of Newfoundland. Environment Canada, Canadian Forestry Service Information Report N–X–128: 54 pp.
Muldrew, J.A. 1973. Larch sawfly — a biological control success story. Environment Canada, Canadian Forestry Service, Northern Forest Research, Edmonton, Alberta. Forestry Report 3(2): 12.
Muldrew, J.A., and Ives, W.G.H.. 1984. Dispersal of Olesicampe benefactor and Mesochorus dimidiatus in Western Canada. Environment Canada, Canadian Forestry Service, Northern Forest Research, Edmonton, Alberta. Information Report NOR–X–258: 35 pp.
Quednau, F.W. 1990. Introduction, permanent establishment, and dispersal in eastern Canada of Olesicampe geniculatae Quednau and Lim (Hymenoptera: Ichneumonidae), an important biological control agent of the mountain ash sawfly, Pristiphora geniculata (Hartig) (Hymenoptera: Tenthredinidae). The Canadian Entomologist 122: 921934.
Quednau, F.W., and Lim, K.P.. 1983. Olesicampe geniculatae, a new palearctic ichneumonid parasite of Pristiphora geniculata (Hymenoptera: Tenthredinidae). The Canadian Entomologist 115: 109113.

ESTABLISHMENT OF OLESICAMPE GENICULATAE QUEDNAU AND LIM (HYMENOPTERA: ICHNEUMONIDAE) TO CONTROL THE MOUNTAIN ASH SAWFLY, PRISTIPHORA GENICULATA (HARTIG) (HYMENOPTERA: TENTHREDINIDAE), IN NEWFOUNDLAND

  • R.J. West (a1), P.L. Dixon (a1), F.W. Quednau (a1), K.P. Lim (a1) and K. Hiscock (a1)...

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