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Chemical Brush Control: Assessing the Hazard

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An adequate evaluation of the hazard associated with the use of any chemical agent requires consideration of both the toxicity of the material and the potential for exposure of nontarget organisms. The hazard can be high only if both the toxicity of the chemical and the potential for exposure to a significant dose are high. The relatively large doses of 2.4-D, amitrole, 2,4,5-T, and picloram required to produce acutely toxic responses in most nontarget organisms are not likely to occur from normal chemical brush control operations on forest lands. The short persistence, lack of biomagnification in food chains, and the rapid excretion of these herbicides by animals preclude chronic exposure and, therefore, chronic toxicity. A long history of field use and research shows our common brush control chemicals can be used with minimum hazard to the quality of our environment.
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Document Type: Journal Article

Affiliations: Principal Chemist, Forestry Sci. Lab., Pac. Northwest Forest and Range Exp. Sta., U.S. Forest Serv., Corvallis, Ore.

Publication date: 01 October 1971

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