Host Tree Species Affects Spruce Budworm Winter Survival

Author:

Berthiaume Richard1,Hébert Christian2,Charest Martin1,Dupont Alain3,Bauce Éric1

Affiliation:

1. Faculté de foresterie, de géographie et de géomatique, Département des sciences du bois et de la forêt, Université Laval, Pavillon Abitibi-Price, 2405 rue de la Terrasse, Québec, Québec, Canada

2. Ressources Naturelles Canada, Service canadien des forêts, Centre de foresterie des Laurentides, Québec, Québec, G1V 4C7 Canada

3. Société de protection des forêts contre les insectes et maladies, 1780, rue Semple, Québec, Québec, G1N 4B8 Canada

Abstract

Abstract With current trends in global warming, it has been suggested that spruce budworm outbreaks may spread to northern parts of the boreal forest. However, the major constraints for a northward expansion are the availability of suitable host trees and the insect winter survival capacity. This study aimed to determine the effect of larval feeding on balsam fir, white spruce and black spruce on various spruce budworm life history traits of both the parental and the progeny generations. Results indicated that the weight of the overwintering larval progeny and their winter survival were influenced by host tree species on which larvae of the parental generation fed. White spruce was the most suitable host for the spruce budworm, producing the heaviest pupae and the heaviest overwintering larvae while black spruce was the least suitable, producing the smallest pupae and the smallest overwintering progeny. Overwintering larvae produced by parents that fed on black spruce also suffered higher winter mortality than individuals coming from parents that fed on balsam fir or white spruce. With current trends in global warming, spruce budworm is expected to expand its range to northern boreal forests where black spruce is the dominant tree species. Such northern range expansion might not result in outbreaks if low offspring winter survival on black spruce persist.

Funder

Natural Sciences and Engineering Research Council of Canada

Publisher

Oxford University Press (OUP)

Subject

Insect Science,Ecology,Ecology, Evolution, Behavior and Systematics

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