Full TGIF Record # 317086
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Web URL(s):https://scisoc.confex.com/scisoc/2021am/meetingapp.cgi/Paper/139230
    Last checked: 03/29/2022
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Peppers, John; Craft, Jordan M.; Askew, Shawn D.
Author Affiliation:Peppers: Crop, Soil and Environmental Science, Virginia Tech, Blacksburg, VA; Craft: School of Plant and Environmental Sciences, Virginia Tech, Blacksburg, VA; Askew: Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA
Title:Spray deposition and herbicide absorption in semi-dormant zoysiagrass
Section:Turf pest management oral III
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C05 turfgrass science
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Meeting Info.:Salt Lake City, Utah: November 7-10, 2021
Source:ASA, CSSA and SSSA International Annual Meetings. 2021, p. 139230.
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 potential turfgrass injury when applying nonselective herbicides to zoysiagrass because sporadic green leaves and stems can be found within the subcanopy throughout winter dormancy. The first objective of this research was to determine the effect of nozzle type, height above target, and spray pressure on droplet size and velocity and the penetration of spray droplets into a zoysiagrass turf canopy. The second objective was to evaluate absorption and translocation of 14C-glyphosate and 14C-glufosinate in zoysiagrass when applied to green leaves or subtending stolons selected from a semi-dormant canopy. Increasing pressure from 103 to 414 kPa increased droplet velocities from XR and TTI nozzles and increased droplet diameters of XR nozzles. Droplet diameters were larger when using TTI nozzles compared to XR nozzles. When XR nozzles were positioned 61 cm above zoysiagrass turf, 73 % of recovered colorant was extracted from the upper canopy and 11 % was extracted from the lower canopy based on fluid extraction and spectrophotometric analysis of three 1.9-cm canopy partitions. All other nozzle configurations deposited less droplets into the upper canopy than into the lower canopy. Results indicate that droplet diameter is more determinant of turfgrass canopy penetration than droplet velocity. Absorption of glyphosate or glufosinate was up to four times greater when zoysiagrass stolons were exposed compared to leaves. Avoiding induction-type nozzles and raising spray height may slightly decrease penetration of droplets into a zoysiagrass subcanopy, but 28 to 45 % of droplets still reached the middle and lower canopy layers in this research. Thus, subcanopy green leaves and stems will likely be exposed and will readily absorb both glyphosate and glufosinate. These data suggest that limiting green tissue at application may be a more prudent approach to safening semi-dormant zoysiagrass from nonselective herbicides when compared to altering sprayer configuration."
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Peppers, J., J. M. Craft, and S. D. Askew. 2021. Spray deposition and herbicide absorption in semi-dormant zoysiagrass. Agron. Abr. p. 139230.
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    Last checked: 03/29/2022
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