Rate and Depth of Sapwood Occlusion Following Inoculation of Pines with Bluestain Fungi
Length of sapwood lesions, depth of sapwood occlusion, and proportion of sapwood occluded increased generally but irregularly through the first 9 weeks following inoculation of small (17-32 cm dbh) Pinus ponderosa with Ophiostoma minus or Leptographium terebrantis. No significant increases were detected between 9 and 64 weeks. The average proportion of sapwood depth occluded at 4 weeks ranged from 0.1-0.15 for O. minus and 0.2-0.4 for L. terebrantis. This rate of occlusion was judged inadequate per se to account for development of crown symptoms in trees following mass attack by bark beetles. For. Sci. 38(1):34-44.
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Document Type: Journal Article
Affiliations: Professor, Department of Entomological Sciences, University of California, 201 Wellman Hall, Berkeley, CA 94720
Publication date: 1992-02-01
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