Canadian Forest Service Publications
Développement de Odontia bicolor chez le sapin baumier infecté artificiellement. 1974. Lachance, D. Canadian Journal of Forest Research 4(3) : 327-334.
Issued by: Laurentian Forestry Centre
Catalog ID: 15428
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In a balsam fir stand, two different humus moisture conditions were artificially produced and maintained for 2 years by covering the forest floor with polythene sheets on two out of four plots. In the two covered sample plots the water saturation of the humus layer was 30% lower and the moisture contents of root-wood was 35% lower than those of uncovered plots. Roots in covered plots, inoculated with Odontia bicolor, showed 51.4% infection as compared to 57.7% for those growing in control plots. Similarly, trunk inoculations yielded infection levels of 35.8% and 44.5%, respectively. Statistical tests show no significant difference in infection percentages between wetter and drier conditions for roots and trunks, and a significantly greater susceptibility to infection of the roots by O. bicolor as compared to the trunks. Growth rates of the fungus toward the trunk (in the roots) or up the trunks of of 4.4-5.8 cm per year was 25-44% greater than growth in the opposite direction. Root and trunk sizes had no definite influence on infection percentages and growth rate, but the latter was always faster in trunk wood than in root wood.