Full TGIF Record # 317042
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Web URL(s):https://scisoc.confex.com/scisoc/2021am/meetingapp.cgi/Paper/137295
    Last checked: 03/24/2022
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Publication Type:
Content Type:Abstract or Summary only
Author(s):Putri, Atikah; de Castro, Edicarlos; Wilber, Amy L.; McCurdy, James D.
Author Affiliation:Putri, de Castro, and Wilber: Mississippi State University, Mississippi State, MS; McCurdy: Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS
Title:Quinclorac resistant smooth crabgrass (Digitaria ishaemum): Rate response and control
Section:Turfgrass pest management oral I (includes student competition)
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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. 137295.
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. Quinclorac-resistant smooth (D. ischaemum) and large crabgrass (D. Sanguinalis) have been confirmed in few instances, but resistance is often suspected due to failed field-level control. Two Mississippi smooth crabgrass populations suspected of quinclorac resistance were characterized using standard rate-response screens. They required 5 and 80 times more herbicide to reach 50% foliar biomass reduction than susceptible populations. A field experiment was conducted in 2020 and 2021 to evaluate programmatic approaches to control one of these resistant populations. Treatments included preemergence herbicides applied in sequence on February 17/April 10, 2020 and February 25/April 6, 2021, or with the second seasonal application applied in combination with 0.84 kg quinclorac ha1 on April 10, 2020 and April 6, 2021 followed by (fb) a second application of quinclorac alone on June 18, 2020 and June 16, 2021. A non-ionic surfactant was included within all applications (0.25% vol vol-1). Preemergence treatments included: 0.05 kg indaziflam ha-1; 0.84 kg prodiamine ha-1; 0.56 kg dithiopyr ha-1; and 0.47 kg prodiamine ha-1 + 0.21 kg imazaquin ha-1 + 0.73 kg simazine ha-1. Commercial standards applied April 10/June 18, 2020 and April 6/June 16, 2021 included: 0.155 kg pinoxaden ha-1; and 2.27 kg MSMA ha-1. Four weeks after the final application, all treatments except quinclorac (2020 and 2021), dithiopyr (2020), and pinoxaden (2020) controlled quinclorac-resistant smooth crabgrass greater than 90%. Combination of quinclorac with preemergence strategies controlled smooth crabgrass greater than quinclorac applied alone. Smooth crabgrass populations were resistant to quinclorac in the field. A variety of standard preemergence strategies adequately controlled this population. Ongoing research investigates the mechanism of resistance for two Mississippi populations. Future research should screen a wider distribution of smooth and large crabgrass populations; cross- and multiple-resistance should be investigated."
See Also:See also related article "Assessing a programmatic approach for the control of quinclorac-resistant smooth crabgrass (Digitaria ischaemum) in established bermudagrass turf" International Turfgrass Society Research Journal, 14(1) June 2022, p. 1084-1087, R=321557. R=321557
Note:This item is an abstract only!
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Putri, A., E. de Castro, A. L. Wilber, and J. D. McCurdy. 2021. Quinclorac resistant smooth crabgrass (Digitaria ishaemum): Rate response and control. Agron. Abr. p. 137295.
Fastlink to access this record outside TGIF: https://tic.msu.edu/tgif/flink?recno=317042
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    Last checked: 03/24/2022
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