Canadian Forest Service Publications

Smaller European elm bark beetle found in Ottawa. 1973. Kondo, E.S.; Huntley, G.D. Bi-Monthly Research Note 29(5):29.

Year: 1973

Issued by: Great Lakes Forestry Centre

Catalog ID: 37253

Language: English

Availability: PDF (request by e-mail)

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We examined stage-specific mortality factors and their relative importance, generating life tables drawn from experimentally-manipulated and natural cohorts of Sirex spp. For both cohorts, factors which acted during the earliest Sirex life stages, most likely tree resistance and/or competition among fungal associates, were paramount in woodwasp survival. Experimenally-manipulated life tables revealed that protection from the community of associates resulted in a significantly larger (more than 15X) S. noctilio F1 generation than exposure to it. These analyses suggest that tree resistance and/or competition likely contribute more than natural enemies in maintaining the S. noctilio population below damaging levels in North America.