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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=132
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Dernoeden, Peter H. |
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| Author Affiliation: | Professor, Department of Agronomy, University of Maryland, College Park, MD |
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| Title: | Review of creeping bentgrass tolerance to herbicides |
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| Section: | Turfgrass and plant growth regulators workshop - Thursday January 7
Other records with the "Turfgrass and plant growth regulators workshop - Thursday January 7" Section
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| Meeting Info.: | Baltimore, MD: January 4-7, 1993 |
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| Source: | Proceedings of the 47th Annual Meeting of the Northeastern Weed Science Society. Vol. 47, 1993, p. 132-133. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Golf greens; Golf courses; Agrostis stolonifera; Herbicide resistance; Discoloration; Herbicide injury; Application timing; Environmental factors; Cultural methods; Tank mix; Weed control; Comparisons; Non-target effects
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| Abstract/Contents: | "Most commercially available herbicides are known to discolor or severely damage creeping bentgrass (Agrostis palustris Huds.), particularly bentgrass grown on putting greens. Herbicides that creeping bentgrass normally tolerates may lose their margin of safety when applied during periods of heat or drought stress or when applied to poorly drained putting greens where root system depth is restricted to the upper inch of soil. Creeping bentgrass turf maintained under low nitrogen fertility, very low mowing (<5/32 inches), or putting greens treated with plant growth regulators also are more susceptible to herbicide injury. There are few herbicides registered for use on creeping bentgrass, and even fewer for putting greens. It is important to note that the relative safety of labelled herbicides applied to vegetatively propagated, and many of the new seeded creeping bentgrass cultivars, is unknown. All herbicides applied to creeping bentgrass should be field tested under local conditions and bentgrass cultivars before they are used on a wide scale. Some of the more commonly used herbicides labelled for creeping bentgrass turf are listed in Table 1. Of those listed, only bensulide, bensulide + oxadiazon, dithiopyr, MCPP, and specially formulated "bentgrass" mixtures of 2,4-D + MCPP + dicamba are labelled for use on putting greens. Herbicides such as fenoxaprop and ethofumesate show promise for use on putting greens, but are only labelled for use on bentgrass tees or fairways at the present time. Bensulide-containing products have been used for decades for the purpose of preemergence crabgrass (Digitaria spp.), goosegrass (Eleusine indica [L.] Gaertn.), and annual bluegrass (Poa annua L.) control on greens. Bensulide, however, provides erratic annual grass weed control in some regions. Recent research indicates that perennial types of P. annua are not controlled by bensulide. The package-mix of bensulide plus oxadiazon was first used on putting greens in the early 1980's. This product provides excellent goosegrass control, and fairly good crabgrass control. Some bentgrass yellowing may occur within 10 to 14 days of application. Dithiopyr was labelled for use on creeping bentgrass greens, and most other turfgrasses in 1991. Dithiopyr effectively controls goosegrass preemergence and crabgrass both pre and early postemergence. For putting greens, dithiopyr should be applied in early spring as a preemergence treatment. Because of its residual effectiveness, dithiopyr can be applied as early as February or March without loss of activity. Reports of dithiopyr injury to bentgrass greens have been few thus far, and restricted to overlapping spray error, particularly on poorly drained greens with shallow bentgrass root systems. Dithiopyr, however, can yellow bentgrass if applied during warm periods. June applications, when daytime temperatures exceed 90F, can cause extensive damage to both bentgrass and annual bluegrass on greens. Hence, it is best to apply this product in March or April as a preemergence treatment for crabgrass or goosegrass control on greens. The early preemergence timing of dithiopyr will also minimize potential late summer overseeding problems with bentgrass. White clover (Trifolium repens L.) and mouseear chickweed (Cerastium vulgatum L.) are among the most common broadleaf weeds on greens, and they are generally safely controlled with MCPP. MCPP applied during summer will yellow putting green turf, and when applied alone, MCPP provides relatively poor control of most other broadleaf weeds. When several different broadleaf weed species colonize greens, specially formulated mixes, known as a "bentgrass formula" of 2,4-D + MCPP + dicamba is used. These special mixes contain about 80% less 2,4-D than "regular" prepackage mixtures. This is because 2,4-D can be extremely phytotoxic to creeping bentgrass. Use of these "bentgrass formulations", however, are frequently associated with bentgrass yellowing or severe damage if not properly applied." |
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| Language: | English |
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| References: | 0 |
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| Note: | Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Dernoeden, P. H. 1993. Review of creeping bentgrass tolerance to herbicides. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 47:p. 132-133. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1993_vol47.pdf#page=132
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 v. 53 |
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