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.
Issued by: Great Lakes Forestry Centre
Catalog ID: 37253
Availability: PDF (request by e-mail)
Plain Language Summary
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.