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The Epidemiology of Pitch Canker of Monterey Pine in California

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The progression of pitch canker disease, caused by Fusarium circinatum, was followed over 4 yr (1992–1996) in urban stands of Monterey pine, Pinus radiata, with initially zero, light, moderate, and severe disease intensity. The disease progressed from a few to many branch tip symptoms, followed by the appearance of cankers on the main stem. Symptomatic branch tips at the start of the study were predictive of tree mortality or removal after 4 yr. Trees with canopy dieback and stem cankers were often attacked by the red turpentine beetle, Dendroctonus valens. Among initially disease-free trees, disease progression and final severity were greater in plots with initially severe and moderate disease intensity. Apparent infection rates did not differ between plots with different initial disease intensities. Over the 4 yr of the study, 2% of trees in the five plots with most severe disease never exhibited disease symptoms and thus may be resistant to pitch canker. In addition, 7% of symptomatic trees in these plots never had more than two symptomatic branch tips, which may reflect a moderate level of resistance.. FOR. SCI. 48(4):694–700.

Keywords: Fusarium circinatum; Pinus radiata; disease progression; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; natural resource management; natural resources

Document Type: Miscellaneous

Affiliations: 1: The Division of Insect Biology, University of California, Berkeley, CA, Current Address The School of Forest Resources and Environmental Science, Phone:(906) 487-3470; Fax:(906) 487-2915 storer@mtu.edu 2: Division of Insect Biology , University of California, 201 Wellman Hall, Berkeley, CA, 94720, Phone: (510) 642 5538 bigwood@nature.berkeley.edu 3: Department of Plant Pathology, University of California, 384 Hutchison Hall, Davis, CA, 95616, Phone: (530) 754 9893 trgordon@ucdavis.edu

Publication date: November 1, 2002

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.
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