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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=165
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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| Content Type: | Abstract or Summary only |
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| Author(s): | Johnson, B. J. |
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| Author Affiliation: | Professor, Crop and Soil Science, University of Georgia, Georgia Station, GA |
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| Title: | Bermudagrass suppression in creeping bentgrass greens |
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| Meeting Info.: | Williamsburg, VA; January 2-5, 1996 |
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| Source: | Proceedings of the 50th Annual Meeting of the Northeastern Weed Science Society. Vol. 50, 1996, p. 165. |
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| Publishing Information: | College Park, MD: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Agrostis stolonifera; Application frequency; Application rates; Application timing; Cynodon; Encroachment; Growth regulator evaluation; Herbicide evaluation; Weed control
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| Abstract/Contents: | "The encroachment of bermudagrass (Cynodon spp.) into creeping bentgrass (Agrostis stolonifera L.) greens can cause severe contamination where both grasses are grown. Since the growth habit of both grasses is different, this results in a poor quality putting surface. When the mixed turf is left untreated, bermudagrass populations increase rapidly during the summer months when creeping bentgrass is under stress from high temperatures, high humidity, and intensive disease pressure. Tupersan (siduron) has been the recommended herbicide to use for suppressing bermudagrass in bentgrass greens. However, bermudagrass response to Tupersan treatments is variable. Therefore, to improve the consistency of bermudagrass suppression, experiments were conducted with herbicides and plant growth regulators (PGRs) to determine the timing, rates, and frequency of applications needed to suppress bermudagrass effectively in bentgrass greens. Tank mixes of Prograss + Cutless (ethofumesate + flurprimidol) applied at 1.5 + 0.75 lb ai/A in early April (when bermudagrass started to break dormancy) effectievly suppressed bermudagrass for 8 weeks. The suppression was effective throughout the summer with Prograss + Cutless when the full rate (1.5 + 0.75 lb ai/A) was applied in April followed four applications at one-fourth rate (0.38 + 0.19 lb ai/A). The suppression by early September was 72% for Tifgreen, 74% for Tifway, and 93% for common bermudagrass. Timing of repeated applications was important for optimum bermudagrass suppression. The first reduced rate application should be made 6 weeks after the initial application and when repeated at 3-week intervals. Prograss + Cutless applied at 1.5 + 0.75 lb ai/A in April caused moderate to severe injury (26 to 45%) to creeping bent grass. The injury to creeping bentgrass was foliar discoloration with no effect on stand density. Turf recovery occurred within 3 to 5 weeks after treatment. The injury to creeping bentgrass was higher when Prograss + Cutless treatments were made in late spring and summer, than when the applications were made temperatures were cooler in April. This is why reduced Prograss + Cutless treatments are necessary during the warmer temperatures. The injury to creeping bentgrass during the spring and summer from reduced rates of Prograss + Cutless was within an acceptable level (<30%). The quality of creeping bentgrass was higher (17 to 31%) in 2 of 3 years when iron (Fe) (LawwnPlex source) was applied at 1.5 lb/A in April with Prograss + Cutless. The response to Fe with repeated Prograss + Cutless treatments at reduced rates in May occurred in 1 of 3 years. These results show that creeping bentgrass treated with Fe and Prograss + Cutless will not always respond with darker green color. When it does, it will occur more frequently when applied with Prograss + Cutless in cooler temperatures than in warmer temperatures." |
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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):
Johnson, B. J. 1996. Bermudagrass suppression in creeping bentgrass greens. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 50:p. 165. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1996_vol50.pdf#page=165
Last checked: 07/24/2013
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: SB 610 .N62 v. 50 |
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