Octamethylpyrophosphoramide (OMPA) As a Systemic Animal Repellent for Douglas-Fir Seedlings
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.
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Document Type: Journal Article
Affiliations: Forest Wildlife Biologist, Forestry Research Center, Weyerhaeuser Company, Centralia, Washington
Publication date: 1964-03-01
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