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Effect of Sirex noctilio (Hymenoptera: Siricidae) attack density on Pinus sylvestris (Pinaceae) survival

Published online by Cambridge University Press:  15 March 2019

Laurel J. Haavik Open the ORCID record for Laurel J. Haavik [Opens in a new window] ,
Brett P. Hurley  and
Jeremy D. Allison
Laurel J. Haavik*
Affiliation:
Natural Resources Canada-Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen Street E, Sault Ste. Marie, Ontario, P6A 2E5, Canada
Brett P. Hurley
Affiliation:
Department of Zoology and Entomology, Forestry and Agricultural Biotechnology Institute, University of Pretoria, Pretoria, 0002, Gauteng, South Africa
Jeremy D. Allison
Affiliation:
Natural Resources Canada-Canadian Forest Service, Great Lakes Forestry Centre, 1219 Queen Street E, Sault Ste. Marie, Ontario, P6A 2E5, Canada
*
2Corresponding author (e-mail: lhaavik@usda.gov)
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Abstract

Population density is often a critical factor in colonisation of trees by bark and wood-boring insects and may determine whether an exotic species is likely to establish and spread. In a manipulative field study, we investigated whether density of the attacking population of an exotic invasive woodwasp, Sirex noctilio Fabricius (Hymenoptera: Siricidae), affected survival and time-to-death of a favoured host tree, Pinus sylvestris Linnaeus (Pinaceae). We introduced mating pairs of woodwasps to stressed P. sylvestris at either high (15 mating pairs, nine trees) or low (two mating pairs, nine trees) density. More trees died, and more quickly, when exposed to the high versus low density of S. noctilio (78% versus 33% of trees). In the high-density treatment, year of tree death was synonymous with production of a S. noctilio F1 cohort (one-year or two-year generation time); this pattern was not as consistent in the low-density treatment. Although sample size was limited, our results indicate that attack density affects S. noctilio colonisation of P. sylvestris.

Type
Behaviour and Ecology–NOTE
Information
The Canadian Entomologist , Volume 151 , Issue 3 , June 2019 , pp. 340 - 344
Creative Commons
Parts of this are a work of the Her Majesty the Queen in Right of Canada. Part of this is a work of the U.S. Government and is not subject to copyright protection in the United States.
Copyright
© Entomological Society of Canada 2019

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Footnotes

1

Present address: United States Department of Agriculture Forest Service, Forest Health Protection, 1992 Folwell Avenue, St. Paul, Minnesota, 55108, United States of America

Subject editor: Deepa Pureswaran

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