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Annual Variation in Effect of 2,4-D and 2,4,5-T on Ponderosa Pine

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Early spring foliage sprays of low volatile esters of 2,4-D and 2,4,5-T are not safe for releasing ponderosa pines in the Cascade Range. Pines became susceptible to the two phenoxy herbicides in mid-February when the trees appeared completely dormant; susceptibility coincided with first flowers on greenleaf manzanita. Annual variation in susceptibility of ponderosa pine to foliage sprays of 2,4-D and 2,4,5-T provide timing for aerial sprays to release pines in southwest Oregon. Trees are susceptible to damage months before beginning height growth in spring and are most susceptible during active growth in May and June. Susceptibility to herbicides decreases rapidly after new buds form in late June; full resistance is attained in late summer. Ponderosa pine remains resistant until late winter. In Pacific Northwest forests, late summer is the best season for aerial application of 2,4,5-T or 2,4-D to release ponderosa pines with minimum damage to the trees. Greenleaf manzanita was highly susceptible to 2,4-D from late November through May the following year. Ponderosa pine can be released from greenleaf manzanita by aerial application of phenoxy herbicides during late autumn and early winter. Forest Sci. 24:281-287.
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Keywords: Arctostaphylos patula; Pinus ponderosa; Silviculture; brush control; greenleaf manzanita; growth release

Document Type: Journal Article

Affiliations: Research Forester at Pacific Northwest Forest and Range Experiment Station, USDA Forest Service, Forestry Sciences Laboratory, Corvallis, Oregon

Publication date: 1978-06-01

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    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.
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    June 1, 2016 to Feb. 28, 2017

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