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Development of Dwarf Mistletoe Infections on Western Hemlock in Coastal Oregon

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Needles and twigs of western hemlock, Tsuga heterophylla, were inoculated with seed of Arceuthobium tsugense in October 1972, 1973, and 1974. One infection developing from the earlier inoculations produced mature seed within 4 years; however, most produced seed in the fifth year. Success of inoculation was affected by loss of seed to winter storms, fungus attack, and insect predation. Approximately two-thirds of the 4,584 seeds placed on host trees were retained over winter. Seed placed on twigs was more likely to overwinter on the host than seed placed on foliage. About 45 percent of these 3,069 overwintering seeds germinated and about 8 percent (243) caused infection of host tissues. No strong relationship existed between success of infection and branch height or aspect, nor exposure of tree crown to direct light. Forest Sci. 25:237-243.

Keywords: Arceuthobium tsugense; Tsuga heterophylla; epidemiology; forest disease; seed loss

Document Type: Journal Article

Publication date: 1979-06-01

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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