Full TGIF Record # 333515
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Web URL(s):https://scisoc.confex.com/scisoc/2023am/meetingapp.cgi/Paper/150078
    Last checked: 12/06/2023
Publication Type:
Content Type:Abstract or Summary only
Author(s):Godara, Navdeep; Craft, Jordan M.; Goncalves, Clebson Gomes; Askew, Shawn D.
Author Affiliation:Godara: Presenting Author and Virginia Tech, Blacksburg, VA; Craft: Virginia Tech, Blacksburg, VA; Goncalves: Agriculture & Natural Resources, University of California, Ukiah, CA; Askew: Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA
Title:Rainfall relocates glyphosate from dormant zoysiagrass foliage to newly-developed green shoots
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C05 turfgrass science
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Meeting Info.:St. Louis, Missouri: October 29-November 1, 2023
Source:ASA, CSSA, SSSA International Annual Meeting. 2023, p. 150078.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Turfgrass managers are concerned about erratic injury to zoysiagrass from glyphosate during winter dormancy. The severity of glyphosate injury to zoysiagrass increases with increasing green leaves, but injury also occurs following glyphosate application to fully dormant zoysiagrass, especially during rapid post-dormancy shoot emergence. Glyphosate residue could be dislodged and relocated to zoysiagrass during the post-dormancy transition. Research experiments were conducted to determine how simulated raindrop quantity affects the relocation of glyphosate and colorant solution from treated dormant zoysiagrass leaves to underlying green shoots and to assess the response of post-dormant zoysiagrass to glyphosate dislodged and relocated via simulated rainfall, dew, or physical disturbance. Increasing the number of simulated raindrops per 0.5 cm-2 from 1 to 20 removed most of the applied colorant from treated dormant zoysiagrass leaves as <5% of applied colorant was extracted. Exposure of underlying filter paper was inversely related to loss from dormant zoysiagrass leaves. Maximum exposure of a single subtending green shoot was 5% of applied colorant and occurred at 5 simulated raindrops 0.5 cm-2, which would approximate a 3.35 mm rainfall. Furthermore, glyphosate applied to dormant zoysiagrass followed by 3 mm simulated rainfall or dew and wiping 7-9 d later, when turf had reached 15% green cover, reduced zoysiagrass clipping biomass by 35% and 72%, respectively. Glyphosate applied to dormant zoysiagrass can dislodge and injure newly developing green shoots during transition. Injury by dislodged and relocated glyphosate can be mitigated by irrigating at 1-d after glyphosate treatment to dormant turf or ensuring that the first irrigation or rainfall following treatment is at least 12 mm."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Godara, N., J. M. Craft, C. G. Goncalves, and S. D. Askew. 2023. Rainfall relocates glyphosate from dormant zoysiagrass foliage to newly-developed green shoots. Agron. Abr. p. 150078.
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    Last checked: 12/06/2023
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