Canadian Forest Service Publications
Le rôle de la livrée des forêts et de l'arpenteuse de Bruce dans le dépérissement des érablières du sud du Québec. 1990. Bauce, E.; Lachance, D.; Archambault, L. Pages 39-47 dans C. Camire, W. Hendershot, et D. Lachance, éditeurs. Le dépérissement des érablières, causes et solutions possibles. Faculté de Foresterie et géomatique, Université Laval, Sainte-Foy (Québec).
Issued by: Laurentian Forestry Centre
Catalog ID: 14021
CFS Availability: PDF (request by e-mail)
Analysis of insect defoliation (1979-1982; 1984) and crown dieback (1985-1986) maps combined with data collected in 1983 in 120 sugar maple (Acer saccharum Marsh.) stands indicated that forest tent caterpillar (Malacosoma disstria Hbn.) and Bruce spanworm (Operophtera bruceata Hulst) are not dominant factors that can explain sugar maple crown dieback in Southern Quebec. Almost 79% of the area where sugar maples had evidence of crown dieback in 1985-1986 was not subjected to insect defoliation, exceeding 25% of foliage removal, during the last decade. However, a positive relationship was found between the incidence of crown dieback and the number of years when defoliation occurs. In 1983 and in 1985-1986, the incidence of crown dieback was greater in stands defoliated in the early 80's than in undefoliated stands. This suggests that, in certain situations, these two defoliators may have put additional stress on sugar maples.