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Octamethylpyrophosphoramide (OMPA) As a Systemic Animal Repellent for Douglas-Fir Seedlings

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Pseudotsuga menziesii (Mirb.) Franco seedlings readily absorbed OMPA from nutrient solutions, and tissue concentrations were proportional to solution concentration. Phytotoxic symptoms were first observed at 1,500 ppm lethality occurring between 3,000 and 4,000 ppm tissue concentration. OMPA was metabolized in seedlings with a half-life of 50 days between concentrations of 50 to 220 ppm tissue OMPA with evidence of a shorter half-life at higher concentrations and longer at lower concentrations. OMPA was readily translocated in seedlings both up and down the stem when applied to the roots or the foliage. Bio-assay results indicated that OMPA was effective as a systemic repellent for seedlings at foliage concentrations of 400 to 1,000 ppm. Test rabbits clearly differentiated between treated and untreated seedlings--rejecting the former as food.

Document Type: Journal Article

Affiliations: Forest Wildlife Biologist, Forestry Research Center, Weyerhaeuser Company, Centralia, Washington

Publication date: March 1, 1964

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

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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