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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Boyer, J. A.;
Colvin, D. L.;
Littlefield, T. A.;
Weinbrecht, J. S. |
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| Author Affiliation: | University of Florida, Gainesville |
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| Title: | Highway and right-of-way turf maintenance utilizing imazameth |
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| Meeting Info.: | 50th Annual Meeting, Houston, TX, January 20-22, 1997 |
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| Source: | Southern Weed Science Society Proceedings. Vol. 50, January 1997, p. 134. |
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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: | "A field experiment was conducted in Citra, FL in 1996 to determine optimal timing of imazameth application on bermudagrass in conjuction with mowing. Even though bahiagrass (Paspalum notatum) is the main turf for roadside use in Florida, bermudagrass (Cynodon dactylon) has increased in use because it is a good companion to bahiagrass. Bermudagrass has a vigorous lateral growth habit which acts as a physical barrier to weed encroachment in mixed stands with bahiagrass. Interest in the use of plant growth retardants (PGR) in roadside management has increased due to the need for reduction in mowing frequency, labor, and equipment costs. Imazameth is a member of the imidazolinone herbicide family and is classified as a herbicide Type I PGR. Applied in sublethal doses, vegetative and seedhead growth are controlled via the inhibition of acetolactate synthase. The trial site was fertilized with 10-10-10 at 300 lb/A and mowed to a uniform height of four inches three weeks prior to the first application of imazameth. Soil type was a Tavares loamy sand (86% sand, 11% silt, 3% clay) with pH 6.3 and .5% OM. Plot size was 10 ft², and all treated plots received 0.125 lb ai/ac of imazameth and 0.25% v/v nonionic surfactant. Spray applications were made using a CO² pressurized backpack with a hand-held boom sprayer calibrated to deliver twenty gallons per acre. Plots were treated with imazameth five days premowing (DPM), three DPM, one DPM, 2.5 hours premowing (HPM), and application immediately prior to mowing. The experimental design was a randomized complete block with three replications. Treatments were evaluated at 30, 60, and 110 days after treatment (DAT) for injury, and 60 DAT for seedhead inhibition. Bermudagrass response was similar for all applications in conjuction with mowing. Bermudagrass injury averaged 34% at 30 DAT, which is acceptable for roadside use. At 60 DAT, injury averaged 21% and seedhead control averaged 25%. The injury from imazameth application had completely dissipated by the fall transition period, 110 DAT, with an average 7% injury. Bermudagrass seedhead control was not as evident as with bahiagrass, but it was not considered as critical. Although seedhead control was fair, acceptable injury response allows imazameth use in mixed-stands of roadside bermudagrass and bahiagrass." |
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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):
Boyer, J. A., D. L. Colvin, T. A. Littlefield, and J. S. Weinbrecht. 1997. Highway and right-of-way turf maintenance utilizing imazameth. South. Weed Sci. Soc. Proc. 50:p. 134. |
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MSU catalog number: SB 611 .S6 v. 50 |
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