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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary only |
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| Author(s): | Higingbottom, J. K.;
McCarty, L. B. |
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| Author Affiliation: | Department of Horticulture, Clemson University, Clemson, SC 29634-0375 |
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| Title: | Turf species tolerance to imazameth (PLATEAU) |
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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. 134-135. |
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| Publishing Information: | Champaign, IL: Southern Weed Science Society. |
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| # of Pages: | 2 |
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| Abstract/Contents: | "Several studies were conducted in North Carolina, South Carolina, Georgia, and Florida on warm-season turf species for efficacy and selective tolerance to the potential PGR, imazameth (PLATEAU). Five turf species were treated with POST applications of imazameth (Plateau 2 EC) at rates ranging from 0.032 lb ai/A (2 oz product/A) to the highest rate of 0.1875 lb ai/A (12 oz product/A). All treatments included a nonionic surfactant at 0.25% (v/v) of the spray volume. Materials were sprayed with a CO² backpack sprayer in a volume of 20 gpa. Turf species tested were centipedegrass (Eremochloa ophiuroides), Coastal bermudagrass (Cynodon dactylon), Meyer Zoysiagrass (Zoysia Japonica var. 'Meyer'), St. Augustinegrass ( Stenotaphrum secundatum var. 'Raleigh'), and Bahiagrass (Paspalum notatum var. 'Pensacola'). Data included: turfgrass tolerance rating (0-100%); % decreased stand; and overall turf quality (1-10, with 5=minimum acceptable) at regular biweekly intervals. All treatments were replicated three or four times and the experimental design was RCBD for each of the turf species. Bahiagrass for all rates after 4 WAT showed unnacceptable (<5.0) turf quality. By 8 and 16 WAT all rates except for the 0.11 lb ai/A treatments had acceptable quality. Centipedgrass and Coastal bermudagrass were slightly injured at rates ranging from 0.032 lb ai/A to 0.1875 lb ai/A and at all rating periods but was within the acceptable range (<30%). By 10 WAT, both turf species recovered to equal that of the untreated. Meyer zoysiagrass showed >30% injury for all treatments except for 0.063 lb ai/A, but by 4 WAT, injury was <20% for all treatments. At 4 WAT, Raleigh St. Augustinegrass had significant injury (~30%) on all treatments except for the low rate 0.063 lb ai/A, but by 6 WAT, injury was comparable to the untreated. Stand reduction of bahiagrass at 8 WAT was <30% for all treatments except for 0.11 lb ai/A which was at 37%. By 16 WAT all treatments were comparable to the untreated except for the 0.11 lb ai/A which still had some reduction at 18%. St. Augustinegrass, centipedegrass, and Meyer zoysiagrass had minimal (<10%) stand reduction from all treatments and at all rating dates. Imazameth showed considerable potential for bahiagrass seedhead suppression. At 8 WAT, seedhead suppression was still >80% for all treatments. The 0.053 and 0.071 lb ai/A rates provided >90% seedhead suppression for 10 weeks with acceptable turf quality (>8). Rates of 0.094 lb ai/A or 0.063 lb ai/A followed by 0.063 lb ai/A approximately 4 to 6 weeks apart were best for centipedegrass and provided effective (~80%) seedhead suppression for 4 to 6 weeks with minimal turf injury. Rates of 0.047 or 0.063 lb ai/A provided (~80%) seedhead suppression for St. Augustinegrass for 4 to 6 weeks with minimal turf injury. Minimal turf injury also occurred in established Coastal bermudagrass at optimum rates from 0.125 to 0.156 lb ai/A. For Meyer zoysiagrass, rates of 0.125 lb ai/A or 0.063 lb ai/A followed by 0.063 lb ai/A approximately 4 to 6 weeks apart were optimal rates with minimal turf injury. Future research includes evaluating imazameth on cool-season grasses (e.g., Tall Fescue and Kentucky Bluegrass) for tolerance and seedhead suppression. Further developments on the timing of applications verses seedhead development on centipedegrass should be evaluated for differences in seedhead suppression. Reasearchers can also determine the efficacy of the anticipated low rates of imazameth for sedge and broadleaf control. With the correct timing and at applicable rates, imazameth shows considerable potential as a marketable PGR." |
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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):
Higingbottom, J. K., and L. B. McCarty. 1997. Turf species tolerance to imazameth (PLATEAU). South. Weed Sci. Soc. Proc. 50:p. 134-135. |
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MSU catalog number: SB 611 .S6 v. 50 |
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