Canadian Forest Service Publications

Effects of induced competitive interactions with secondary bark beetle species on establishment and survival of mountain pine beetle broods in lodgepole pine. 1999. Safranyik, L.; Shore, T.L.; Linton, D.A.; Rankin, L. Natural Resources Canada, Canadian Forest Service, Pacific Forestry Centre, Victoria, BC. Information Report BC-X-384. 33 p.

Year: 1999

Issued by: Pacific Forestry Centre

Catalog ID: 5203

Language: English

Series: Information Report (PFC - Victoria)

Availability: Order paper copy (free), PDF (download)

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Abstract

The effects of pheromone-induced competition from secondary bark beetle species on mountain pine beetle attack and brood production in mature lodgepole pine wee investigated in south central British Columbia. The effects of delaying baiting for secondary species and of felling host trees (following mountain pine beetle attack) were also examined. The pine engraver (Ips pini (Say)) was the principal competitor in all experiments and three additional secondary species, I. latidens (LeConte) and Dryocoetes affaber Mannerheim were included in one experiment. Baiting simultaneously for mountain pine beetles and pine engravers significantly reduced mountain pine beetle attack density and brood production in one of two trials, due mainly to the repellent effects of the pine engraver bait. Use of pine engraver bait resulted in greater numbers of attacks and increased densities of that species hibernating in duff. Delaying baiting for pine engraver significantly increased their brood production, but usually not that of mountain pine beetle. Felling trees had no significant effect on attack or brood production. Baiting trees for I. latidens or D. affaber about one week after peak attack by mountain pine beetle caused marginal reductions in mountain pine beetle brood density and suggested that a strategy of simultaneous baiting should be explored. The complex interactions of the pine engraver and the mountain pine beetle in response to induced attacks by both species are illustrated using a hypothetical model.