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| Web URL(s): | https://www.wsweedscience.org/wp-content/uploads/WSWS-Proceedings-2020.pdf#page=39
Last checked: 04/17/2024
Requires: PDF Reader
Notes: Item is within a single large file
https://wssa.net/wp-content/uploads/WSSA-Virtual-Annual-Meeting-all-abstracts-updated-4-12-2021ab_FINAL.pdf#page=32
Last checked: 10/31/2022
Requires: PDF Reader
Notes: Item is within a single large file; Abstracts of the Annual Meeting of the Weed Science Society of America reprint |
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| Publication Type:
| Report |
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| Content Type: | Abstract or Summary Only |
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| Author(s): | Omielan, Joe |
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| Author Affiliation: | University of Kentucky, Lexington, KY |
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| Title: | Johnsongrass management on roadsides: Control, suppression, or selectivity? |
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| Section: | Poster session
Other records with the "Poster session" Section
WSWS project 1. Weeds of range, forest, and natural areas
Other records with the "WSWS project 1. Weeds of range, forest, and natural areas" Section
WSSA section 4. Pasture, range, forest, rights of way, wildland, and aquatic invasive plants
Other records with the "WSSA section 4. Pasture, range, forest, rights of way, wildland, and aquatic invasive plants" Section
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| Meeting Info.: | Maui, Hawaii: March 2-5, 2020 |
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| Source: | Western Society of Weed Science Annual Meeting 2020. Vol. 73, March 2020, p. 6-7. |
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| Publishing Information: | Westminster, Colorado: Western Society of Weed Science |
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| # of Pages: | 2 |
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| Abstract/Contents: | "Johnsongrass (Sorghum halepense) is a perennial warm-season grass, listed as a noxious weed in Kentucky, that is a common problem on right-of-ways. There are a number of herbicides labeled and available to control johnsongrass on right-of-ways. However, some of these are nonselective or are selective for johnsongrass but can still damage desirable cool-season turf, such as tall fescue. One of the safer johnsongrass control herbicides to use on tall fescue is Fusion but a label change in 2012 made it unavailable for use on right-of-way sites. This trial evaluated a range of johnsongrass control/suppression options along with the damage and recovery of tall fescue after application. Which options resulted in the best control with least damage? The johnsongrass site had late season regrowth (120 cm canopy) and was treated August 30, 2017 in Rowan County KY. The tall fescue trial was established August 27, 2017 at Spindletop Research Farm in Fayette County KY when the plants were 25 cm high. The trial had 20 treatments with three replications arranged in a randomized complete block design with 2.1 m by 6.1 m johnsongrass plots and 1 m by 3 m fescue plots with 0.5 m unsprayed buffers between each of the plots. Application was at 280 L/ha. Johnsongrass control was assessed 23 (9/22/2017), 53 (10/22/2017), and 302 (6/28/2018) days after treatment (DAT). Tall fescue color was assessed every two weeks by comparison to the running check strips. The color rating ranges from 0 (dead) to 9 (full green). The color of the check strips was set at 8. Plots were assessed 14 (9/9/2017), 29 (9/24/2017), 45 (10/10/2017), 57 (10/22/2017), and 75 (11/9/2017) days after treatment (DAT). In the spring tall fescue stand density was assessed visually from 0 (none) to 10 (full stand) 262 (5/15/2018) and 276 (5/29/2018) DAT. Data were analyzed using ARM software and treatment means were compared using Fisher's LSD at p = 0.05. All the treatments used the required adjuvants. The 2011 Fusion (fluazifop + fenoxaprop) label rates for selective control of johnsongrass were 7 to 9 fl oz/A (Treatments 1 and 2). The rates on the label for Envoy (clethodim) are 16 and 32 fl oz/A (Treatments 3 and 4). Previous trials had used 13, 15, and 17 fl oz/A to find the best selective rate with less fescue damage. The labeled Fusilade II (fluazifop) rates are 16 to 24 fl oz/A (Treatments 5 and 6). The Acclaim Extra (fenoxaprop) label lists 20 fl oz/A per acre to control seedling johnsongrass 12 24 inches tall (Treatment 7); 39 fl oz/A to control rhizome johnsongrass 24 to 60 inches tall (Trt. 8); and a combination of Acclaim Extra plus Fusilade (0.5 plus 3.5 fl oz/A), for improved turfgrass tolerance and to control rhizome johnsongrass 10 to 25 inches tall (Treatment 9). The Outrider (sulfosulfuron) label rates for selective johnsongrass control in tall fescue turf are 0.75 to 1 oz/A (Treatments 10 and 11). Treatment 12 is MSMA (monosodium acid methanearsonate) applied alone (32 fl oz/A) and Treatment 13 is MSMA applied in combination with Outrider at 0.75 oz/A. Clearcast (imazamox) (Treatment 14) (32 fl oz/A) has an aquatic label and may be used close to waterways. The high rate of Plateau (imazapic) (8 fl oz/A) used in Treatment 15 will severely damage tall fescue. Poast Plus (sethoxydim) is a herbicide option we have not tested recently and has control of rhizome johnsongrass up to 25 inches tall on the label for this region of the U.S. (Treatments 16 and 17) (2.25 and 3.75 pt/A). Roundup (glyphosate) (22 7 fl oz/A) (Treatment 18) and Journey (glyphosate + imazapic) (21.3 fl oz/A) (Treatment 19) are non-selective. Treatment 20 was the unsprayed control. At 53 DAT the top group of treatments had 83 to 93% johnsongrass control with many of the same treatments as at 23 DAT. At the second rating they were the high rate of Fusion (Treatment 2), both rates of Envoy (Treatments 3 and 4), both rates of Fusilade II (Treatments 5 and 6), the high rate of Acclaim Extra (Treatment 8), the combination of Acclaim + Fusilade (Treatment 9), Roundup ProMax (Treatment 18), and Journey (Treatment 19). Next spring at 302 DAT the top group of treatments had 69 to 93% control and many of these were not in the top in the 2017 ratings. At this spring rating they were both rates of Envoy (Treatments 3 and 4), the high rate of Fusilade II (Treatment 6), both rates of Outrider (Treatments 10 and 11), both MSMA by itself and in combination with Outrider (Treatments 12 and 13), Clearcast (Treatment 14), Plateau (Treatment 15), Roundup ProMax (Treatment 18), and Journey (Treatment 19). The treatments showing aboveground control more quickly may not necessarily be the ones with the best long term control. Outrider performed well in our trials but is slower to show foliar control. Some treatments showed good safety on tall fescue with color ratings that were consistently not different from the nontreated check over all the ratings while others showed recovery by the end of the season. Treatments with color ratings consistently not different from control included both rates of Fusion (Treatments 1 and 2), both rates of Acclaim Extra (Treatments 7 and 8), MSMA by itself (Treatment 12) and in combination with Outrider (Treatment 13). Treatments that recovered by 75 DAT included the low rate of Envoy (Treatment 3), both rates of Fusilade (Treatments 5 and 6), the combination of Acclaim + Fusilade (Treatment 9), both rates of Outrider (Treatments 10 and 11), both rates of Poast (Treatments 16 and 17), and Roundup (Treatment 18). The high rate of Envoy (Treatment 4), Clearcast (Treatment 14), Plateau (Treatment 15), and Journey (Treatment 19) did not recover before the end of the season. In the spring the tall fescue stand density improved for many treatments between the two rating dates in 2018. By late May (276 DAT) the top group of treatments had density ratings from 6.8 to 9.0 while the sparsest treatments ranged from 1.2 to 5. The latter group included the high rate of Envoy (Treatment 4), Clearcast (Treatment 14), Plateau (Treatment 15), both rates of Poast (Treatments 16 and 17), Roundup (Treatment 18), and Journey (Treatment 19). These would not be recommended if one wants to preserve existing fescue in the application area" |
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| Language: | English |
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| References: | 0 |
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| Note: | Reprint appears in Abstracts of the Annual Meeting of the Weed Science Society of America, 2021, p. 32
This item is an abstract only! |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Omielan, J. 2020. Johnsongrass management on roadsides: Control, suppression, or selectivity?. Proc. West. Soc. Weed Sci. 73:p. 6-7. |
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| Web URL(s):
https://www.wsweedscience.org/wp-content/uploads/WSWS-Proceedings-2020.pdf#page=39
Last checked: 04/17/2024
Requires: PDF Reader
Notes: Item is within a single large file
https://wssa.net/wp-content/uploads/WSSA-Virtual-Annual-Meeting-all-abstracts-updated-4-12-2021ab_FINAL.pdf#page=32
Last checked: 10/31/2022
Requires: PDF Reader
Notes: Item is within a single large file; Abstracts of the Annual Meeting of the Weed Science Society of America reprint |
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