Submitted to: Weed Technology
Publication Type: Peer reviewed journal
Publication Acceptance Date: 12/1/2006
Publication Date: 4/1/2007
Citation: Sheley, R.L. 2007. Tolerance of meadow foxtail (alopecurus pratensis) to two sulfonylurea herbicides. Weed Technology 21:470-472. Interpretive Summary: Meadow foxtail is an important grass that can be injured by herbicides during weed control. I compared the influence of various rates of chlorsulfuron and metsulfuronmethyl on meadow foxtail biomass production. No biomass production losses resulted from applying up to 0.14 kg/ha of either herbicide on meadow foxtail, even in relatively high pH soils. Controlling weeds, especially those in the mustard family of plants, can be done using these herbicides without major production losses.
Technical Abstract: Meadow foxtail is a rhizomatous grass widely grown for hay and pasture in wet meadows of the western United States and Canada. I compared the influence various rates of these two sulfonylurea herbicides on meadow foxtail biomass. Treatments of 0.035, 0.070, 0.105, and 0.140 kg/ai ha of chlorsulfuron or metsulfuron-methyl rates and a non-treated control were applied at each of two sites in October 2003. Treatments were replicated 4-times at each site and arranged in a randomized complete block design and sampled in July 2004 and 2005. Meadow foxtail biomass depended on site (P=0.001) or year (P=0.001), but not herbicide treatment (P=0.182). No biomass production losses resulted from applying up to 0.14 kg/ha of either chlorsulfuron or metsulfuron-methyl on meadow foxtail, even in relatively high pH soils.