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| Web URL(s): | https://www.wsweedscience.org/wp-content/uploads/WSWS-Proceedings-2020.pdf#page=140
Last checked: 06/20/2022
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): | Askew, Whitnee;
Craft, Jordan M.;
Goatley, Mike;
Askew, Shawn |
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| Author Affiliation: | Virginia Tech, Blacksburg, VA |
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| Title: | Zoysiagrass response to nonselective herbicides is more dependent on heat units than geography |
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| Section: | Poster session
Other records with the "Poster session" Section
WSSA section 3: Turf and ornamentals
Other records with the "WSSA section 3: Turf and ornamentals" 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. 107. |
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| Publishing Information: | Westminster, Colorado: Western Society of Weed Science |
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| # of Pages: | 1 |
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| Abstract/Contents: | "Zoysiagrass (Zoysia spp.) is a warm-season grass utilized primarily in lawns and golf courses because of its density, visual quality, drought and wear tolerance, and reduced requirements for water, nutrients, and mowing. Glyphosate and glufosinate are labeled for use in dormant zoysiagrass but turf specialists rarely recommend this practice for fear that zoysiagrass may not be "completely dormant." Concerns about partially-green zoysiagrass turf precluding the use of nonselective herbicides have not been characterized in scientific literature. Five trials were initiated in Blacksburg and Virginia Beach, VA and in Starkville, MS to evaluate zoysiagrass response to glyphosate applied at 700 g ai ha-1 and glufosinate applied at 1680 g ai ha-1 applied at four applications timings in the spring of 2018 and 2019. Growing degree-day at base 32 F (0 C, GDD32) accumulation began on February 1, 2018 and 2019 for all sites and application timings were 200, 400, 600, and 800 GDD32. A mixture of 'Zenith' and 'Companion' zoysiagrass (ZC Blacksburg) mown at 6.3 cm, a 'Meyer' zoysiagrass (M Blacksburg) mown at 1.2 cm, and a 'Zeon' zoysiagrass (Zeon Blacksburg) mown at 1.2 cm served as trial sites in Blacksburg, VA. A 'Meyer' zoysiagrass mown at 2 cm was evaluated in Starkville, MS and a 'Compadre' zoysiagrass mown at 6.3 cm was evaluated at Virginia Beach, VA. All experiments were arranged in randomized complete block design with four replications. Visually-estimated zoysiagrass injury data were collected biweekly and temporal trends were fit to the Gaussian function using Proc NLIN in SAS 9.4 for each experimental unit and resulting estimated parameters were subjected to ANOVA and means separated using Fisher's Protected LSD P = 0.05. The c parameter was used to calculate the number of days over a threshold of 30% injury (DOT30) which was also subjected to ANOVA and means separation. The two 'Meyer' zoysiagrass locations mown at 1.2 to 2 cm had 20±13, 51±15, 132±35, and 218±32 green leaves dm-1 at 200, 400, 600, and 800 GDD32, respectively. 'Zeon' zoysiagrass mown at 1.2 cm had 15±8, 48±17 175±27, and 265±35 green leaves dm-1 200, 400, 600, and 800 GDD32, respectively. CZ Blacksburg and Virginia Beach zoysiagrass mown at 6.3 cm had approximately 42% less leaves dm-1 at equivalent timings. Glyphosate applied at 200 GDD32 and 400 GDD32 did not injure zoysiagrass above the 30% threshold level at any location. Glufosinate applied at 400 GDD32 injured zoysiagrass over threshold level for 10 to 25 days at all locations. At 600 and 800 GDD32 timings, glufosinate caused maximum zoysiagrass injury of over 85% regardless of location while glyphosate injury maxima ranged from 20 to 70%. Glyphosate can safely be applied to zoysiagrass at 200 GDD32 regardless of growing regions between northern Mississippi and Virginia. The results indicate zoysiagrass injury increases when herbicides are applied later in the season when more green foliage is present regardless of growing region." |
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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):
Askew, W., J. M. Craft, M. Goatley, and S. Askew. 2020. Zoysiagrass response to nonselective herbicides is more dependent on heat units than geography. Proc. West. Soc. Weed Sci. 73:p. 107. |
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| Web URL(s):
https://www.wsweedscience.org/wp-content/uploads/WSWS-Proceedings-2020.pdf#page=140
Last checked: 06/20/2022
Requires: PDF Reader
Notes: Item is within a single large file |
| 
MSU catalog number: b2224583 |
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