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DETERMINING POTENTIAL RISK TO NATIVE PLANTS FROM HERBICIDE DRIFT: COMPARATIVE RESPONSE OF SELECTED CROP AND NATIVE PLANT SPECIES TO GLYPHOSATE AND SULFOMETURON
Citation:
OLSZYK, D. M., T. G. PFLEEGER, M. BLAKELY-SMITH, E. LEE, H. MILLER, AND M. PLOCHER. DETERMINING POTENTIAL RISK TO NATIVE PLANTS FROM HERBICIDE DRIFT: COMPARATIVE RESPONSE OF SELECTED CROP AND NATIVE PLANT SPECIES TO GLYPHOSATE AND SULFOMETURON. Presented at Society of Environmental Toxicology and Chemistry, SETAC Europe 16th Annual Meeting, The Hague, NETHERLANDS, May 07 - 11, 2006.
Description:
abstract/abstract
While native plant communities may be at risk from herbicide use, current crop-centric test procedures for pesticide registration may not adequately represent the sensitivity of native non-crop plants to herbicides. We are designing a protocol to determine the effects of herbicides on native plants to address not only the question of potential impacts of drift, but also whether certain herbicides can be used in a restoration context to selectively favor native plants while simultaneously controlling invasive plants. We compared the response to sulfometuron of 8 native and naturalized non-crop species from prairie areas of Illinois and Oregon's Willamette Valley vs. 7 crop species; and the response to glyphosate of 17 non-crop species from the Willamette Valley vs. 3 crop species. Herbicide rates ranged between 0.1 and 0.001 x a field application rates of 52 g / Ha for sulfometuron and 833 g / Ha for glyphosate. Response variables included height, leaf injury and shoot biomass 14 days after treatment. The effective herbicide concentration producing a 25% change in a parameter (EC25) was used to determine if species responded differently to herbicides.