Fastlink to record 267142
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| Full TGIF Record # 267142 Item 1 of 1 |
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| Web URL(s): | https://scisoc.confex.com/crops/2015am/webprogram/Paper91385.html Last checked: 11/20/2015 |
| Publication Type: | Report |
| Content Type: | Abstract or Summary only |
| Author(s): | McCullough, Patrick E.; Yu, Jialin; Czarnota, Mark; Raymer, Paul L. |
| Author Affiliation: | Yu: Plant Pathology; McCullough, Czarnota, and Raymer: University of Georgia - Griffin, Griffin, GA |
| Title: | Physiological basis for metamifop selectivity in turfgrass |
| Section: | C05 turfgrass science Other records with the "C05 turfgrass science" Section Turfgrass science: II Other records with the "Turfgrass science: II" Section |
| Meeting Info.: | Minneapolis, Minnesota: November 15-18, 2015 |
| Source: | ASA, CSSA and SSSA International Annual Meetings. 2015, p. 91385. |
| Publishing Information: | [Milwaukee, Wisconsin]: [American Society of Agronomy and the Entomological Society of America] |
| # of Pages: | 1 |
| Keywords: | TIC Keywords: Bermudagrass control; Control methods; Cultivar evaluation; Foliar uptake; Goosegrass control; Herbicide evaluation; Herbicide resistance; Metamifop; Physiological responses; Selectivity |
| Abstract/Contents: | "Metamifop controls bermudagrass and goosegrass in cool-season turfgrasses, but the mechanisms of selectivity are not well understood. The objectives of this research were to determine the physiological basis for selectivity of metamifop in turfgrass. In greenhouse experiments, metamifop rate required to reduce shoot biomass 50% from the nontreated (GR50) at 4 weeks after treatment (WAT) was >6400, 53, and 2166 g ai ha-1 for creeping bentgrass, goosegrass, and Kentucky bluegrass, respectively. The GR50 for bermudagrass treated with diclofop-methyl or metamifop was 2850 and 60 g ha-1, respectively. In laboratory experiments, peak absorption of 14C-metamifop was reached at 48, 72, and 96 h after treatment (HAT) for goosegrass, creeping bentgrass and Kentucky bluegrass, respectively. Grasses translocated <10% of the absorbed radioactivity out of the treated leaf at 96 HAT, but creeping bentgrass translocated 3x more radioactivity than goosegrass and Kentucky bluegrass. Creeping bentgrass and Kentucky bluegrass metabolized 15% of the absorbed 14C -metamifop after 96 h. Goosegrass metabolized 25% of the absorbed 14C -metamifop and had higher levels of a polar metabolite than creeping bentgrass and Kentucky bluegrass. The concentration of metamifop required to inhibit isolated ACCase enzymes 50% from the nontreated (I50) measured >100, 38, and >100 uM for creeping bentgrass, goosegrass, and Kentucky bluegrass, respectively. In other experiments, foliar absorption of 14C -metamifop in bermudagrass was similar to 14C -diclofop-methyl. Bermudagrass metabolized 23% and 60% of the absorbed 14C -diclofop-methyl to diclofop acid and a polar conjugate after 96 h, respectively, but only 14% of 14C -metamifop was metabolized. Bermudagrass ACCase was equally susceptible to inhibition by diclofop acid and metamifop, suggesting degradation rate is associated with the differential tolerance levels to these herbicides." |
| Language: | English |
| References: | 0 |
| Note: | This item is an abstract only! "418-5" "Poster Number 717" |
| ASA/CSSA/SSSA Citation (Crop Science-like – may be incomplete): | McCullough, P. E., J. Yu, M. Czarnota, and P. L. Raymer. 2015. Physiological basis for metamifop selectivity in turfgrass. Agron. Abr. p. 91385. |
| Fastlink to access this record outside TGIF: | http://tic.msu.edu/tgif/flink/RECNO/267142 |
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| Web URL(s) : | https://scisoc.confex.com/crops/2015am/webprogram/Paper91385.html Last checked: 11/20/2015 |
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