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| Web URL(s): | http://www.newss.org/proceedings/proceedings_1986_vol40.pdf#page=130
Last checked: 07/25/2013
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): | Cooper, R. J.;
Karnok, K. J.;
Henderlong, P. R.;
Street, J. R. |
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| Author Affiliation: | Ohio State University |
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| Title: | Influence of mefluidide timing and rate on Poa annua L. seedhead suppression |
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| Source: | Proceedings of the Annual Meeting of the Northeastern Weed Science Society. Vol. 40, 1986, p. 129-130. |
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| Publishing Information: | Ithaca, N. Y. : Northeastern Weed Science Society |
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| # of Pages: | 2 |
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| Keywords: | TIC Keywords: Poa annua; Mefluidide; Application rates; Application timing; Phytotoxicity; Discoloration; Weed control; Growth regulators; Poa annua control; Seedhead inhibition; Golf courses; Golf fairways; Emergence; Time-of-year
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| Abstract/Contents: | "Many golf course fairways in the northern United States contain substantial amounts of annual bluegrass (Poa annua L.). Annual bluegrass exhibits extensive seedhead formation during spring which lowers turf quality and places a considerable demand on plant carbohydrate reserves. Studies were conducted during 1981, 1982, and 1983 to evaluate the growth regulator 'mefluidide' (Embark) for annual bluegrass seedhead suppression under golf course conditions in Ohio. Mefluidide was applied at rates including 1/16, 1/8 and 1/4 a.i./acre in either late October 1981 or mid-April 1981 to 1983 to determine which combination of timing and rate would provide maximum seedhead suppression with minimal phytotoxicity. Visual ratings of seedhead cover were made weekly throughout the spring seedhead development period (1=no seedheads present, 9=complete seedhead cover). Seedhead emergence on untreated turf began April 20 during 1981 and April 22 during 1982, with seedhead cover lasting approximately four weeks both years. During 1983, seedhead emergence began April 10 and continued for about nine weeks. The influence of mefluidide on Poa annua seedhead development is shown in Table 1. Mid-April mefluidide application during both 1981 and 1982 provided excellent seedhead suppression for the entire seedhead development period at all rates evaluated. In both years, discoloration in response to mefluidide became evident approximately one week after temperatures slowed initial seedhead development and prolonged the duration of seedhead emergence on untreated turf. Seedhead cover on mefluidide treated turf did not vary from that of untreated turf until May 2, three weeks after initial seedhead emergence. Mefluidide applied April 12 at 1/8 or 1/4 a.i./acre significantly inhibited seedhead cover from May 10 through May 31. Discoloration resulting from mid-April application during 1983 was less than in previous years and only reduced quality for one week. October 1981 mefluidide treatments provided substantial seedhead suppression during April and May 1982. However, suppression was due to complete foliar dieback resulting from extensive winter injury rather than selective suppression of emerging seedheads. October mefluidide application resulted in very poor turfgrass quality during April and May 1982. Fall mefluidide application is not recommended due to its potential for causing severe winter injury. Our evaluations indicate that spring mefluidide application at rates as low as 1/16 a.i./acre can be expected to provide reliable suppression of Poa annua seedhead development. However, application at 1/8 a.i./acre is recommended in order to protect against poor seedhead inhibition due to underapplication or suboptimal uptake under adverse environmental conditions. Some temporary discoloration of the turf typically resulted from mefluidide application and usually lasted two to three weeks. Following this discoloration, mefluidide treated turf exhibited quality superior to untreated turf for three to five weeks due to superior color and density." |
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| Language: | English |
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| References: | 0 |
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| Note: | This item is an abstract, with table, only!
Reprint appears in The Mountain State Greenletter May 1986:8(2) p.4
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Cooper, R. J., K. J. Karnok, P. R. Henderlong, and J. R. Street. 1986. Influence of mefluidide timing and rate on Poa annua L. seedhead suppression. Proc. Annu. Meet. Northeast. Weed Sci. Soc. 40:p. 129-130. |
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| Web URL(s):
http://www.newss.org/proceedings/proceedings_1986_vol40.pdf#page=130
Last checked: 07/25/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: SB 610 .N62 |
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