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Disease of Douglas-Fir Seeds During Cone Storage

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Abstract:

Seeds in Douglas-fir cones stored for 225 days under operational conditions were free of disease; but during germination tests after extraction, up to 56 percent of them became diseased. Almost all nongerminable seeds were diseased. Disease incidence increased to different extents with length of cone storage in 3 cone lots and fluctuated in another. Bacteria and several fungi were associated with the disease. Storing extracted seeds at 40° F for 7 months did not affect the disease incidence. Also unrelated to disease incidence were cone moisture content, scale opening, pitchiness, percentage of cone surface covered by mycelia, density of mycelia around seeds in cones, fungus genera, and number of empty seeds. The results suggest that disease incidence is a function of cone-storage period and the disease resistance, which is expressed only under conditions of the germination tests, and is positively correlated with seed maturity.

Keywords: Pseudotsuga menziesii; seed and cone fungi; seed maturity

Document Type: Journal Article

Affiliations: Research Scientist, Forest Research Laboratory, Dept. of Fisheries and Forestry, 506 West Burnside Road, Victoria, B. C.

Publication date: June 1, 1969

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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