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Further Effects of Bark Saprophytes on Hypoxylon Canker

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Solutions containing the saprophytes that occurred on the healthy bark of P. trichocarpa were effective in totally inhibiting the growth of H. pruinatum on 1 and 2% water agar and on media containing 1 and 2% agar and 5% malt extract. Solutions sterilized by autoclaving or filtering through Millipore or Fritted glass filters were not effective in preventing the growth of the pathogen. Canker attack by H. pruinatum was delayed considerably when drying cuttings of P. trichocarpa were dipped in test solutions prior to inoculation. Apparently, the solution dips provided a greater coverage of bark saprophytes on the host that, for a period, suppressed the development of the pathogen and, consequently, afforded a measure of biological control of the disease. Cultural studies demonstrated that the degree of antagonism between the bark saprophytes and the pathogen could be modified by environmental change in different substrates, thus opening the way to an analysis of the factors affecting the expression of antagonism in field material.

Document Type: Journal Article

Affiliations: Professor of Forest Pathology and Research Associate in Forest Pathology

Publication date: 1963-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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