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Dwarf Mistletoe Damage to Small Ponderosa Pines

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Ponderosa pine saplings developed from grafts with mistletoe-infected scions were compared with saplings developed from grafts with healthy scions. Healthy and diseased scions were from the same source trees. After 12 years, 33 percent of the mistletoe-infected trees had been killed and the remainder were only half as tall as the uninfected. The endophytic system of the mistletoe bridged the graft union in 30 percent of the infected trees. In a second experiment, small saplings were repeatedly inoculated with mistletoe seed. Fifteen years after the first inoculations all trees had 2 or more main-stem infections and additional branch infections, but the gradual increase in plant number with time allowed a fuller crown development and correspondingly less severe damage than occurred with graft-infected trees. Mean height growth of infected saplings under three levels of competitive suppression was reduced 0.25 inch per year per mistletoe plant. Pathogenic suppression of growth was greatest where suppression by other trees was heaviest. Forest Sci. 17:373-380.
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Keywords: Arceuthobium campylopodum; Pinus ponderosa

Document Type: Journal Article

Affiliations: Forest Pathologist, Oregon State University, Corvallis 97331

Publication date: 1971-09-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 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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