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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Murphy, T. R.;
Johnson, B. J. |
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| Author Affiliation: | Agronomy Division, The University of Georgia |
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| Title: | Tolerance of bentgrass and overseeded bermudagrass greens to simazine treated irrigation water |
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| Meeting Info.: | San Antonio, TX: January 14-16, 1991 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 44, 1991, p. 187. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Simazine; Weed control; Resistance; Agrostis stolonifera; Cynodon; Lolium perenne; Visual evaluation; Analysis; Injuries
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| Geographic Terms: | Georgia |
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| Abstract/Contents: | "Simazine (Princep) is the primary herbicide used for winter annual weed control on non-overseeded bermudagrass fairways in Georgia and most surrounding states. Simazine (Aquazine) is also used for aquatic weed control in ponds. In Georgia, ppb levels of simazine have occasionally been detected in golf course irrigation ponds. As simazine is injurious to cool-season turfgrasses, superintendents are reluctant to irrigate putting greens with water that contains simazine. Experiments were conducted in 1989 and 1990 to evaluate the tolerance of 'Penncross' creeping bentgrass and a 'Tifway' bermudagrass/perennial ryegrass mixture to irrigation water that contained simazine. Creeping bentgrass and overseeded bermudagrass were maintained at 0.4 and 0.6 cm, respectively, clipping height. Simazine at 0, 0.01, 0.03, 0.09, 0.27, 0.81 and 2.43 ppm in an irrigation water volume of 0.63 cm was applied in each of seven applications. Creeping bentgrass treatments were initiated in mid-July and continued for seven consecutive days. Overseeded bermudagrass treatments were initiated in mid-April and continued at two day intervals for 14 consecutive days. Turfgrass quality and density ratings were recorded at various times after application on a scale of 1 to 10, where 1 = brown or dead turf and no turf cover, and 10 = dark green, uniform turf and dense turf cover. Creeping bentgrass was more sensitive to injury from simazine than overseeded bermudagrass. Regression analysis showed that the critical simazine concentration necessary to reduce turfgrass quality < [or equal to] 6.0 after a total of seven applications was 0.27 and 1.17 ppm for creeping bentgrass and overseeded bermudagrass, respectively. Simazine at concentrations > [or equal to] 0.81 ppm significantly hastened the spring transition from perennial ryegrass to bermudagrass; however, turfgrass quality was unacceptable to 14 days after the last application. Simazine concentrations > [or equal to] 0.81 ppm reduced creeping bentgrass density. At 28 DAT, simazine at 2.43 ppm reduced creeping bentgrass density to 70%" |
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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):
Murphy, T. R., and B. J. Johnson. 1991. Tolerance of bentgrass and overseeded bermudagrass greens to simazine treated irrigation water. South. Weed Sci. Soc. Proc. 44:p. 187. |
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MSU catalog number: SB 611 .S6 |
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