Skip to main content

Field Tests of the Capacity of Phytophthora Root Rot to Damage Douglas-Fir

Buy Article:

$21.50 plus tax (Refund Policy)

When Phytophthora cinnamomi was discovered on ornamentals in the Pacific Northwest, questions were raised as to its potential for damage to commercial forests of the region. Was the forest industry to prepare to combat a dangerous epiphytotic; to develop a stand management program to reduce chronic losses; or simply to keep a watchful eye? Absence of the fungus from Oregon's forests was shown by negative isolation results from 1800 forest soil samples whereas 30 percent of check samples from certain nurseries yielded P. cinnamomi. To test pathogenesis under field conditions, inoculum of P. cinnamomi as liquid cultures, agar cultures, and infested soil was introduced into the soil at 53 inoculation points in logged-off Douglas-fir sites of two general types and into the soil of a thicket of fir saplings. The fungus was not recoverable following the dry summers characteristic of the region. It was not recovered on south slopes after late June nor on north slopes, with two exceptions persisting until October, after August. Measurable growth from inoculum into forest soil occurred only during the spring when infested soil served as the inoculum. Inoculations in the root zone of the sapling thicket failed to produce symptoms in the samplings and the fungus could not be recovered later than June. One group of inoculated sites tended to be cool and moist, the other to be warm and dry. Neither completely represented the more moderate soil micro-climate obtaining under full Douglas-fir cover and on more gentle topography; therefore, the conclusion that P. cinnamomi will not survive the summer climate of this region should not be generalized to all sites without reservation.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Data/Media
No Metrics

Document Type: Journal Article

Affiliations: Plant Pathologist, Southeastern Forest Expt. Sta., Forest Service, U.S. Dept. Agric., Asheville, N.C.

Publication date: 1963-03-01

More about this publication?
  • The Journal of Forestry is the most widely circulated scholarly forestry journal in the world. In print since 1902, the Journal has received several national awards for excellence. The mission of the Journal of Forestry is to advance the profession of forestry by keeping forest management professionals informed about significant developments and ideas in the many facets of forestry: economics, education and communication, entomology and pathology, fire, forest ecology, geospatial technologies, history, international forestry, measurements, policy, recreation, silviculture, social sciences, soils and hydrology, urban and community forestry, utilization and engineering, and wildlife management. The Journal is published bimonthly: January, March, May, July, September, and November.

    2016 Impact Factor: 1.675 (Rank 20/64 in forestry)

    Average time from submission to first decision: 39.6 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Forest Science
    Other SAF Publications
  • Submit a Paper
  • Membership Information
  • Author Guidelines
  • Podcasts
  • SAF Convention Abstracts
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free content
  • Partial Free content
  • New content
  • Open access content
  • Partial Open access content
  • Subscribed content
  • Partial Subscribed content
  • Free trial content
Cookie Policy
X
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