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Notes: Effects of the Herbicides Bifenox, DCPA, and Napropamide on Mycorrhiza Development of Ponderosa Pine and Douglas-fir Seedlings in Six Western Nurseries

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The herbicides bifenox, DCPA, and napropamide were each applied at two different rates to beds of Douglas-fir and ponderosa pine for weed control in several nurseries in California, Oregon, and Washington. At the end of the first growing season no herbicide treatment significantly reduced proportion of feeder roots colonized by mycorrhizal fungi or number of mycorrhizal types as compared to controls for either tree species. Ponderosa pine seedlings treated with DCPA, however, had a significantly greater proportion of feeder roots mycorrhizal than those treated with the other two herbicides and a significantly greater mean number of mycorrhiza types than controls or napropamide treatments. Douglas-fir treated with napropamide had significantly more mycorrhiza types, reflecting a greater diversity of mycorrhizal fungi, than those treated with DCPA or bifenox. Forest Sci. 29:464-468.

Keywords: Pinus ponderosa; Pseudotsuga menziesii; mycorrhizal fungi; root growth

Document Type: Miscellaneous

Affiliations: Principal Mycologist, Pacific Northwest Forest and Range Experiment Station, Forestry Sciences Laboratory, 3200 Jefferson Way, Corvallis, Oregon 97331

Publication date: 1983-09-01

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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 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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