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| Web URL(s): | http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=236
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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| Publication Type:
| Report |
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| Author(s): | Elmore, M.;
Brosnan, J.;
Mueller, T. C.;
Kopsell, D. A.;
Breeden, G. K. |
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| Author Affiliation: | University of Tennessee, Knoxville, TN |
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| Title: | The effect of growing degree-day-based application timings on dallisgrass (Paspalum dilatatum) control in tall fescue |
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| Section: | Graduate student oral paper contest
Other records with the "Graduate student oral paper contest" Section
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| Meeting Info.: | Houston, Texas: January 28-30, 2013 |
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| Source: | Proceedings of the Southern Weed Science Society: 66th Annual Meeting. Vol. 66, 2013, p. 149. |
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| Publishing Information: | Champaign, Illinois: Southern Weed Science Society |
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| # of Pages: | 1 |
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| Keywords: | TIC Keywords: Application timing; Dallisgrass control; Festuca arundinacea; Fluazifop; Growing degree days; Herbicide efficacy
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| Abstract/Contents: | "Dallisgrass (Paspalum dilatatum) is a perennial warm-season graminaceous weed found throughout the southern United States. Selective control of dallisgrass in tall fescue (Festuca arundinacea) is difficult. The ACCase-inhibiting herbicide fluazifop-p-butyl (fluazifop) is labeled for use in tall fescue. Previous reports indicate dallisgrass control with fluazifop varies with seasonal application timing, but more investigation is warranted. Additionally, the HPPD-inhibiting herbicides mesotrione, topramezone and tembotrione are being researched for use in turfgrass and may have dallisgrass activity. In 2010 and 2011 field experiments evaluated fluazifop (105 g ha-1) alone or in combination with mesotrione (280 g ha-1), topramezone (37 g ha-1) and tembotrione (92 g ha-1) applied at different growing degree day- (GDD) or cooling degree day- (CDD) based application timings. GDD's were calculated using a 10 °C base beginning January 1. CDD's were calculated by subtracting the average daily temperature from a 22 °C base beginning July 1. The influence of fall or spring tall fescue interseeding was also evaluated. Herbicide treatments were applied through flat-fan nozzles with NIS at 0.25% v/v and 280 L ha-1 of water using a standard CO2-powered backpack sprayer. Interseeding treatments were applied using a slit-seeder at 353 kg pure live tall fescue seed per hectare. The irrigated experiment site contained a natural dallisgrass infestation and was maintained as a home lawn with respect to irrigation and mowing. Plots were arranged in a split-split plot randomized complete block design with three replications. Dallisgrass control and tall fescue injury were evaluated 2, 4, 8, 18, and 52 weeks after treatment (WAT). Grid counts were conducted 52 WAT to quantitatively assess dallisgrass control. Fluazifop applied at 175 GDD and 5 CDD provided the greatest control 52 WAT in 2010; application at 5 CDD provided greater dallisgrass control than treatments applied at 75, 375 and 775 GDD at 8 and 18 WAT in 2011 as well. Combining HPPD-inhibitors with fluazifop did not improve control compared to fluazifop alone in either year. Application of mesotrione alone provided < 20% dallisgrass control regardless of application timing or evaluation date. Tembotrione and topramezone controlled dallisgrass < 65% regardless of application timing or evaluation date. Fall interseeding improved dallisgass control 52 WAT from herbicide treatments applied at 175, 375 and 775 GDD in 2010 and at 75, 175, 375 and 775 GDD in 2011. Spring interseeding did not improve dallisgrass control. Data suggest fluazifop applications at 175 GDD and 5 CDD and fall interseeding will provide the greatest dallisgrass control in tall fescue. Future research should investigate GDD and CDD-based herbicide application timings in other locations in order to further refine programs for selective dallisgrass control. More CDD-based application timings should be investigated to determine how fluazifop efficacy changes as CDD's accumulate in fall." |
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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):
Elmore, M., J. Brosnan, T. C. Mueller, D. A. Kopsell, and G. K. Breeden. 2013. The effect of growing degree-day-based application timings on dallisgrass (Paspalum dilatatum) control in tall fescue. South. Weed Sci. Soc. Proc. 66:p. 149. |
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| Web URL(s):
http://www.swss.ws/wp-content/uploads/docs/2013 Proceedings-SWSS.pdf#page=236
Last checked: 08/12/2013
Requires: PDF Reader
Notes: Item is within a single large file |
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MSU catalog number: b2207931 |
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