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Evidence of Resistance to the Pitch Canker Pathogen (Fusarium circinatum) in Native Stands of Monterey Pine (Pinus radiata)

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Resistance of Monterey pine, Pinus radiata, to pitch canker, caused by Fusarium circinatum, was investigated in a naturally regenerated native stand and a planted stand on the Monterey Peninsula, California. A dose of 125 spores was selected to test resistance as it produced significant differences in mean lesion length among trees. The resistance ranking of trees remained comparable when inoculated three times over a period of seven months, but the mean lesion length decreased with each inoculation. Lesion lengths were positively correlated with symptom development. In the naturally regenerated stand, 30% of the trees formed lesions less than 5 mm long and were considered resistant to the pathogen. In contrast, only 5% of trees in the planted stand formed lesions less than 5 mm long. The use of prescribed burning of Monterey pine stands to augment natural regeneration allows a wider expression of genetic diversity in the new host populations on which natural selection in favor of resistant genotypes can be imposed by the pathogen. For. Sci. 45(4):500-505.

Keywords: F. moniliforme var. subglutinans; Fusarium subglutinans; forest management

Document Type: Journal Article

Affiliations: Division of Insect Biology, 201 Wellman Hall, University of California, Berkeley, CA 94720 : Phone: (510) 642-5538:

Publication date: November 1, 1999

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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