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Seasonal Tolerance of Six Coniferous Species to Eight Foliage-Active Herbicides

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The selectivity of eight foliage-active herbicides (2,4-D, 2,4,5-T, silvex, dichlorprop, triclopyr, fosamine, glyphosate, and asulam) applied at different phenological stages of development to six coniferous species (ponderosa pine, Jeffrey pine, sugar pine, Douglas-fir, white fir, and red fir) was compared. Conifers were more tolerant to herbicide applications after fall dormancy. Herbicide treatments in spring or summer often resulted in substantial conifer injury and mortality. These periods corresponded to times when moisture stress was low and photo-synthesis was high. Pine species were more tolerant to fall applications of glyphosate. A relationship between conifer phenology, moisture stress, photosynthesis, and herbicide tolerance was observed. Forest Sci. 26:3-9.

Keywords: Water stress; photosynthesis; tree phenology

Document Type: Journal Article

Affiliations: Extension Weed Scientist, Department of Botany, University of California, Davis, Calif. 95616

Publication date: March 1, 1980

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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