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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Askew, S. D.;
Beam, J. B.;
King, S. R. |
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| Author Affiliation: | Virginia Tech, Blacksburg, Virginia |
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| Title: | Nimblewill control in cool-season turf |
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| Section: | Weed management in turf, pasture, and rangeland
Other records with the "Weed management in turf, pasture, and rangeland" Section
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| Meeting Info.: | 55th Annual Meeting, Atlanta, GA: January 28-30, 2002 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 55, 2002, p. 64. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Nimblewill (Muhlenbergia schreberi) is one of the most common perennial grass weeds in Virginia lawns. Often mistaken for common bermudagrass (Cynodon dactylon), nimblewill ranges from the mountains to the coastal plain and can be found in many turf species and settings. A search of extension recommendations from seven universities, including Virginia Tech, did not uncover any guidelines for selective control of nimblewill in cool-season turfgrass. Two new herbicides, mesotrione and isoxaflutole, show promise for selective postemergence control of nimblewill in cool-season turf. Studies were conducted to evaluate herbicide programs including the agricultural formulations of mesotrione and isoxaflutole for postemergence control of nimblewill and turf tolerance. Two field experiments were conducted in mature turfgrass (>10 yr) at different locations in Blacksburg. Areas with uniform nimblewill infestation were selected. Turf species were predominately Kentucky bluegrass (Poa pratensis) and tall fescue (Festuca arundinacea) with occasional perennial ryegrass (Lolium perenne). Nimblewill infestation ranged from 10 to 100% coverage in all plots at densities between 100 to > 1000 plants per m2. Plots were two by two meters. The study design was a randomized complete block with treatments replicated three times. Experimental areas were mowed at 9 cm with the mulching attachment in place to prevent movement of clippings between adjacent plots. Herbicides were sprayed with a CO2 pressurized backpack sprayer at 280 L/ha. Treatments included: isoxaflutole applied once at 0.03, 0.08, and 0.17 kg ai/ha or twice at 0.03 kg/ha; mesotrione applied once at 0.03, 0.08, 0.17, and 0.28 kg ai/ha or twice at 0.03 kg/ha; triclopyr applied once at 1.1, 2.2, and 3.4 kg ai/ha or four times at 1.1 kg/ha; and fenoxaprop applied four times at 0.10 kg ai/ha. All sequential applications were applied at 10 d intervals. Weed control was visually evaluated at 4 and 8 weeks after initial treatment (WAT). Only mesotrione at 0.28 kg ai/ha injured turf (10 to 20%). No injury was noted at lower rates of mesotrione or from other herbicide treatments. Triclopyr at any rate controlled white clover (Trifolium repens) at least 99%. Clover control increased with increasing isoxaflutole rate between 83 and 99%, while the lowest rate applied sequentially controlled clover 100%. Mesotrione and fenoxaprop did not effectively control white clover. Triclopyr at ≥ 1.1 kg ai/ha, isoxaflutole at ≥ 0.08 kg ai/ha, and mesotrione at ≥ 0.08 kg ai/ha controlled ground ivy (Glechoma hederacea) at least 88%. Repeated applications of triclopyr were more effective than repeated applications of fenoxaprop for nimblewill control. However, these herbicides did not control nimblewill greater than 47%. Nimblewill control increased with increasing mesotrione and isoxaflutole rates. At four WAT, mesotrione and isoxaflutole at ≥ 0.08 kg ai/ha controlled nimblewill at least 70%. At eight WAT, more nimblewill regrowth was evident in mesotrione-treated plots compared to isoxaflutole-treated plots. Sequential applications provided better control than single applications. For example, isoxaflutole and mesotrione at 0.08 kg ai/ha controlled nimblewill 62 and 30%, respectively 8 WAT; two 0.03 kg ai/ha treatments controlled nimblewill 87 and 55%, respectively. Results indicate that triclopyr and fenoxaprop are not viable options for selective nimblewill control in cool-season turfgrass. Mesotrione and isoxaflutole at appropriate rates selectively control nimblewill without harming desirable turf." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Askew, S. D., J. B. Beam, and S. R. King. 2002. Nimblewill control in cool-season turf. South. Weed Sci. Soc. Proc. 55:p. 64. |
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