Skip to main content

Fusarium Root Rot of Douglas-fir Seedlings: Suppression by Soil Fumigation, Fertility Management, and Inoculation with Spores of the Fungal Symbiont Laccaria laccata

Buy Article:

$29.50 plus tax (Refund Policy)


Mortality of Douglas-fir seedlings caused by Fusarium oxysporum in nursery beds was lessened by soil fumigation and increased by applications of urea fertilizer. Losses were directly related to amount of urea applied (0 to 112 kg N/ha), regardless of timing (before or up to 11 weeks after sowing seed). Mortality rates were temporarily lower in plots inoculated at or shortly after sowing time with basidiospores of the ectomycorrhizal fungus Laccaria laccata than in noninoculated plots. This treatment did not influence subsequent mycorrhizal formation. A factorial experiment showed that growth of seedlings during the first season was increased by presowing addition of 179 kg/ha of P in superphosphate but not by up to 168 kg/ha N from urea or up to 134 kg/ha K from potassium sulfate. Root rot losses were least where nitrogenous fertilizer was withheld during the first growing season. Infected seedlings were stunted but many remained alive. With biweekly applications of nitrogenous fertilizer in the second season, previously stunted seedlings grew nearly as large as seedlings that had remained healthy during the first-year period of susceptibility. These findings imply that (a) further research on inoculation with mycorrhizal fungi should focus upon establishment of the fungal symbiont; (b) through soil fumigation and fertility management, losses of Douglas-fir seedlings in nurseries to Fusarium root rot can be reduced to acceptable levels while quality of the final seedling crop is maintained. Forest Sci. 21:390-399.

Keywords: Pseudotsuga menziesii; biological control; nursery management; root disease

Document Type: Journal Article

Affiliations: Technical Manager, Weyerhaeuser Company, P.O. Box 527, Rochester, WA 98579

Publication date: December 1, 1975

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
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more