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Pathogenicity of Verticicladiella penicillata (Grosm.) Kendrick to Northern Idaho Conifers

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Roots of Pinus contorta, P. ponderosa, Pseudotsuga menziesii, Larix occidentalis, and Abies grandis, ranging 5.8 to 30.5 cm dbh, were inoculated with Verticicladiella penicillata previously isolated from black stain in roots of P. ponderosa. Roots of all species became infected although the characteristic black stain was not observed in P. contorta and P. ponderosa and appeared infrequently in A. grandis. No trees were killed as a result of infection within the 160-day test period indicating weak pathogenicity under study conditions. Hyphae of V. penicillata were concentrated in tracheids of all species tested and moved from tracheid to tracheid via hyphal branching through bordered pit pairs. Occasional hyphal fragments were observed in ray parenchyma. There was resin occlusion of all xylem elements, particularly ray cells. No direct lysing of tracheid walls was found. Additional variation in the morphology of V. penicillata was found. Forest Sci. 27:103-110.

Keywords: Root-stain disease; black stain root disease

Document Type: Journal Article

Affiliations: Forest Insect and Disease Management, U.S. Forest Service, Albuquerque, NM 87102

Publication date: March 1, 1981

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.

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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