Canadian Forest Service Publications
Sugar maple decline, acid rain, pest interactions in the Northeast. 1989. Lachance, D. Pages 102-105 in Healthy forests, healthy world. Proceedings of the 1988 SAF (Society of American Foresters) National Convention, October 16-19, 1988, Rochester, New York. The Society, Bethesda, Maryland, USA.
Issued by: Laurentian Forestry Centre
Catalog ID: 14135
Availability: PDF (download)
Since about 1960, sugar maple decline has occurred in the Northeastern States and Eastern Canada at times extending over large areas. A major center of decline occurs in Quebec Province. In 1987, aerial survey estimates indicated 16 000 acres with severe decline, 133 000 acres with moderate, and over 2.5 million acres with light decline. In this and in neighboring provinces and states, suspected causes are insect defoliation, management practices, climatic disturbances, or a combination of these. However, in Quebec as decline occurs over a very large area, a response to an overlying stress factor is suspected. Recent climatic extremes may be a primary cause but acid precipitations are also blamed. The Quebec situation may be unique as it is located in a area of the continent where relatively high levels of acid precipitations fall on soils classified as having a high acid sensitivity potential. Foliar analyses of declining trees suggest an acid rain effect.