Aspen Bibliography

J.E. Bier

Document Type

Article

Journal/Book Title/Conference

Canada, Department of Agriculture [Tech. Bull. Dep. Agric. Can.]

Volume

691

Issue

27

Publication Date

1940

Abstract

It is generally accepted that the economic importance of poplar is increasing, and a more detailed knowledge of the diseases affecting the various species is urgently needed.

This investigation deals with a canker disease found on aspen poplar (Populus tremuloides Michx. and P. grandidentata Michx.) resulting from the attack of the fungus Hypoxylon pruinatum (Klotzsch) Cooke. The heavy mortality due to Hypoxylon canker in widely separated regions clearly indicates this to be a most destructive disease of young aspen. Lorenz and Christensen (15) after making a survey of the disease in the Lake States mention that "Hypoxylon pruinatum causes heavy losses throughout the Lake States, and is probably one of the most important diseases of aspen throughout the range of the tree." A major purpose of the study is to describe and illustrate the cankers and causal organism throughout the various stages in their development. Again, it was considered essential to determine, by means of artificial inoculation experiments and observations on the disease in the field, the factors influencing the natural spread of the disease. In the investigation of this phase, experiments are now under way to demonstrate the possibility of the causal organism occurring on hosts other than poplar.

It is felt that studies of this character may assist the forester practising silviculture in aspen stands, with respect to choice of location for permanent sample plots, or the carrying out of improvement cuttings, and in the actual practices of thinning and disposal of diseased material.

Recently poplar-breeding studies have been initiated in Canada. The susceptibility of all parent strains and resulting hybrids to Hypoxylon canker should be determined as a prerequisite to the establishment of plantations.

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