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  • Author or Editor: E. Patrick Fuerst x
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This study evaluated the response of rose to different herbicides applied as simulated drift. Chlorsulfuron {2-chloro-N-[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]benzenesulfonamide}, thifensulfuron {3[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)amino]carbonyl]amino]sulfonyl]-2-thiophenecarboxylic acid}, bromoxynil(3,5-dibromo-4-hydroxybenzonitrile), 2,4-D[(2,4-dichlorophenoxy)acetic acid], glyphosate [N-(phosphonomethyl) glycine], and a combination of 2,4-D and glyphosate were applied over the top of established rose plants at 1/3, 1/10,1/33, and 1/100 of the maximum labeled rate for grains. All herbicides injured rose. The greatest injury was from chlorsulfuron and 2,4-D, and the least injury was from bromoxynil and glyphosate. Plants recovered from the injury caused by all treatments except for the highest rates of chlorsulfuron and 2,4-D, which continued to show significant injury at the end of the growing season. Although all herbicides had characteristic symptoms, some of these were very similar to those caused by other stresses. Therefore, because of the potential ambiguity of visual symptoms, any allegation about herbicide drift should be based on a report of all symptoms and should be supported by residue analysis.

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