Full TGIF Record # 324997
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Web URL(s):https://scisoc.confex.com/scisoc/2022am/meetingapp.cgi/Paper/142049
    Last checked: 01/31/2023
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Putri, Atikah; Castro, Edicarlos; Singh, Varsha; Te-Ming, Tseng; McCurdy, James D.
Author Affiliation:Putri: Presenting Author and Mississippi State University; Castro, Singh, Te-Ming and McCurdy: Mississippi State University
Title:Confirmation and mechanism of resistance of quinclorac-resistant smooth crabgrass (Digitaria ischaemum)
Section:Turfgrass pest management oral I (includes student competition)
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C05 turfgrass science
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Meeting Info.:Baltimore, Maryland: November 6-9, 2022
Source:ASA, CSSA, SSSA International Annual Meeting. 2022, p. 142049.
Publishing Information:[Madison, Wisconsin]: [American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America]
# of Pages:1
Abstract/Contents:"Quinclorac controls crabgrass (Digitaria spp.) in cool- and warm-season turfgrass species. Intensive selection pressure from repeated use of quinclorac led to the evolution of herbicide-resistant smooth crabgrass biotypes. Two Mississippi populations (MSU1 and MSU2) of smooth crabgrass were suspected of quinclorac resistance due to failed control during routine applications. A study was conducted to confirm and identify the mechanism of resistance of these biotypes. They were characterized using standard greenhouse rate-response screens in order to assess their tolerance relative to a known susceptible population (SMT). MSU1 and MSU2 required 80 and 5 times more quinclorac, respectively, to reach 50% biomass reduction than SMT, which confirmed suspected resistance of these two populations. The mechanism of resistance was then investigated. MSU1, MSU2 and SMT were sprayed at the three-leaf stage with 0.42, 0.84, 2.52, and 7.6 kg quinclorac ha-1. The susceptible SMT biotype accumulated three times more cyanide than resistant MSU1 and MSU2 populations. Further studies investigated glutathione-S-transferase (GST) activity as a potential contributing factor to non-target site resistance. GST activity was elevated in the MSU1 and MSU2 populations. These findings suggest a non-target site-based mechanism of resistance involving the accumulation of cyanide. This research also indicates that GST-family of enzymes was responsible for detoxification of quinclorac herbicide in resistant populations. This may provide scientific basis for understanding the occurrence of quinclorac-resistant smooth crabgrass, yet further research is needed to investigate potential target-site mechanisms of resistance."
See Also:Related abstract appears in Proceedings of the Southern Weed Science Society 75th Annual Meeting, Vol. 75, p. 145 with variant title, "Programmatic approaches to control Quinclorac-resistant smooth crabgrass (Digitaria ishaemum) in bermudagrass (Cynodon Spp.) turf", R=325143. R=325143
This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Putri, A., E. Castro, V. Singh, T. Te-Ming, and J. D. McCurdy. 2022. Confirmation and mechanism of resistance of quinclorac-resistant smooth crabgrass (Digitaria ischaemum). Agron. Abr. p. 142049.
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