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| Web URL(s): | http://www.newss.org/proceedings/proceedings_2001_vol55.pdf#page=112
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): | Taylorson, R. B. |
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| Author Affiliation: | Adjunct Professor, Department Plant Sciences, University of Rhode Island, Kingston, RI |
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| Title: | Rapidity of glyphosate rainfastness on cool-season turfgrasses |
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| Section: | Turfgrass and plant growth regulators
Other records with the "Turfgrass and plant growth regulators" Section
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| Meeting Info.: | Boston Marriott Cambridge, Cambridge, MA: January 2, 3, 4, and 5, 2001 |
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| Source: | Proceedings of the 55th Annual Meeting of the NortheasternWeed Science Society. Vol. 55, 2001, p. 112. |
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| Publishing Information: | Ithaca, NY: Northeastern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Glyphosate; Rainfastness; Cool season turfgrasses; Poa pratensis; Fine fescues; Application timing; Application rates; Irrigation
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| Abstract/Contents: | "Experiments were conducted in 1999 and 2000 on glyphosate rainfastness in mixed Kentucky bluegrass (Poa pratensis) and fine fescue (Festuca spp.) turfs. In 1999, three formulations were evaluated in a non-replicated strip trial. Glyphosate applications were follwed by a period of time for uptake, then given a measured amount (0.1 in.) of simulated rainfall by sprinkler irrigation. Timing of herbicide application was staggered such that all timed treatments terminated when irrigation was begun. The glyphosate formulations were original Roundup, Roundup Pro and Roundup Pro Dry. The liquid formulations were applied at 15, 30, 60 and 90 minutes after glyphosate application. A no-rainfall control was covered during irrigation. Percent turfgrass kill 3 weeks after treatment was 95-100% for all timings, but kill was faster when simulated rainfall was appliaed at 30 or more minutes after herbicide treatment. Differences between formulations were minor. On July 13, 2000, Roundup Pro Dry at 1.6 and 4.0 oz. ai/gal. was applied in 94 gpa to a fine fescue turf. The plots received 0.1 and 0.2 inches of simulated rainfall at 15, 30, 60 minutes after herbicide application. No rain controls of the two application rates were also included. The plots were 5 ft. wide by 10 ft. long, replicated four times, and arranged in two separate blocks, one for each rainfall amount. Within each block were the rate and rainfall timing treatments. Separating the blocks were the two no-rainfall controls and buffer strips. As before, applications were staggered so as to terminate simultaneously. Ratings of turf kill were taken over a 56-day period after treatment and used as a measure of rainfastness. Seven days after treatment (DAT), glyphosate at 1.6 oz. and at all rainfall timings displayed less turf damage than the 4.0 oz. rate, although not always statistically significant. Similarly, turf damage increased as timing of rainfall introduction increased from 15 to 60 minutes. At 10, 14, and 21 DAT, all treatments of the 4.0 oz. rate and the rainfall timings of 30 and 60 minutes were statistically similar, with percent kill ratings 90% or better. At 42 DAT however, the 1.6 oz. rate with 0.1 inch irrigation 15 minutes after application was rated only 68% turf kill, significantly less than all other treatments. The marked reduction was due to regrowth. This treatment showed further reduction to 36% turf kill by 56 DAT. Other 1.6 oz. treatments were also showing varying degrees of recovery which were not all significant. Percent turf kill from the 4.0 oz. treatments wiht rainfall timings of 15, 30 and 60 minutes after application were still in the 90's. These studies show that glyphosate (Roundup Pro Dry) became rainfast within 30 minutes at the 4.0 oz. rate, but the rainfast period was more variable at the 1.6 oz. rate. These studies suggest glyphosate rainfastness is a function of application rate, the timing and amount of rainfall and the specific plant species." |
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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):
Taylorson, R. B. 2001. Rapidity of glyphosate rainfastness on cool-season turfgrasses. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 55:p. 112. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_2001_vol55.pdf#page=112
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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