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Reduction of Phellinus weirii Inoculum in Douglas-Fir Stumps by the Fumigants Chloropicrin, Vorlex, or Methylisothiocyanate

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Three dosages of chloropicrin and Vodex, with and without sealing, and one dosage of methylisothiocyanate (MIT) in capsules or open glass tubes were applied to Douglas-fir stumps to reduce Phellinus weirii (Mutt.) Gilb. inoculum. After 2 years, all fumigants had reduced the amount of inoculum, but MIT was less effective than chloropicrin or Vorlex. Neither higher levels of fumigant nor sealing the stump tops resulted in further reduction of inoculum. Inoculum in dead stumps was not further reduced by covering stumps with a plastic tarp. Presence of advanced decay did not seem to be advantageous for movement of the fumigant in stumps and roots. Assessment of inoculum survival by using either aseptic isolation techniques or observations of fungal regrowth on the cut surfaces of incubated root disks were comparable for detecting viable P. weirii in root disks from untreated stumps. As a percentage of prefumigation inoculum volume, isolations from fumigated stumps, indicated more viable P. weirii in roots (22%) than did fungal regrowth (7%). Most root disks contained viable P. weirii where residual fumigant was not detected in bioassays, whereas viable P. weirii was not found in 26 of 27 root disks where fumigant was detected. For. Sci. 33(2):316-329.
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Keywords: Laminated root rot; Pseudotsuga menziesii; chemical control; disease control; root disease

Document Type: Journal Article

Affiliations: Forestry Sciences Lab, Corvallis, OR

Publication date: 1987-06-01

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.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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