Full TGIF Record # 333378
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Web URL(s):https://scisoc.confex.com/scisoc/2023am/meetingapp.cgi/Paper/150697
    Last checked: 11/30/2023
Publication Type:
Content Type:Abstract or Summary only
Author(s):Ramon Romero, Juan; Askew, Shawn D.
Author Affiliation:Ramon Romero: Virginia Tech, Blacksburg, VA, US; Askew: Plant Pathology, Physiology, and Weed Science, Virginia Tech, Blacksburg, VA
Title:Individual plant treatment with cryogenic liquids
Section:Turf pest management oral I (includes student competition)
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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. 150697.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Spot treating weeds in ornamental landscapes is a recognized weed control method, but its adoption for professional turf management has been limited by labor costs, poor quality application products, and lack of education on product delivery methods. Recent advances in artificial intelligence will likely expand automation in turfgrass management. Turf managers can use individual plant treatment (IPT) to overcome herbicide resistance issues, prevent injury to high-value turf via selective placement, and adopt alternate strategies to synthetic pesticides. One such strategy is cryogenic liquid treatment. Liquid nitrogen (LN) can kill weeds but is difficult to use due to contact injury to humans, dangerously high vapor expansion rate, and rapid volatility under normal atmospheric conditions. These problems are easily solved with robotic automation, but research is needed to determine LN doses that kill key weeds. Studies were conducted to determine methods to quantify and deliver known doses of LN to annual bluegrass weeds and creeping bentgrass turf. A medical LN application device was customized to allow for downward LN application to turf and the dispense rate and volatility losses were determined gravimetrically. Known doses were administered to 1 dm2 plots of each species and phytotoxicity assessed via digital image analysis. Assuming a spot treatment area of 11.1 cm2 or 3.5 cm diameter, each plot was equivalent to nine IPTs and rates were expressed as ml LN per hypothetical weed. Creeping bentgrass lost 16.7% green color for each additional ml LN applied with 2.5 ml LN per 11.1 cm2 reducing turf green color 50%. Annual bluegrass green color was nearly eliminated at rates above 1.25 ml at 7 DAT and 1.5 ml at 14 DAT. These data suggest that 2 ml LN per weed or less can effectively control annual bluegrass making LN a potentially economical choice to manage low-percentage escaped weeds."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ramon Romero, J., and S. D. Askew. 2023. Individual plant treatment with cryogenic liquids. Agron. Abr. p. 150697.
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    Last checked: 11/30/2023
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