Efficacy of 2,4-D Choline/Glyphosate Dimethylamine on Glyphosate Resistant Canada Fleabane (&amp;lt;i&amp;gt;Conyza canadensis&amp;lt;/i&amp;gt;) at Different Sizes

Ford, Laura; Soltani, Nader; Robinson, Darren E.; Nurse, Robert E.; McFadden, Allan; Sikkema, Peter H.

doi:10.4236/ajps.2014.518292

Cited by 1 publication

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“…Similarly, control of GR horseweed with saflufenacil at 6 WAA was maximized for plants up to 5 cm in height, with 99% control due to death of most plants and minimal green tissue; as height increased, control decreased to 95% for plants>25 cm in height, as fewer plants were completely dead and more regrowth occurred. In a field study for GR horseweed control in corn with 2,4-D choline/glyphosate DMA at various rates, no difference in control was found due to varying horseweed height at application, as similar rates were predicted to control 10, 20, or 30 cm plants (Ford et al 2014b).…”

Section: Resultsmentioning

confidence: 99%

“…Byker et al (2013b) reported that saflufenacil (25 g ai ha −1 ) plus glyphosate (900 g ai ha −1 ) provided 88 to 100% control of GR horseweed 4 WAA in soybean. Variable results were reported by Ford et al (2014b), in which saflufenacil (50 g ai ha −1 ) provided 98 to 100% control 8 WAA at four of five sites, but only 49% control was obtained at a fifth site. Others have reported variable control of GR horseweed with saflufenacil in growers' fields and published literature.…”

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confidence: 93%

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Efficacy of Saflufenacil for Control of Glyphosate-Resistant Horseweed (Conyza canadensis) as Affected by Height, Density, and Time of Day

et al. 2017

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Control of glyphosate-resistant (GR) horseweed in soybean with glyphosate (900 g ai ha−1) plus saflufenacil (25 gaiha−1) has been variable. The objective of this research was to determine the effect of GR horseweed height, density, and time of day (TOD) at application on saflufenacil plus glyphosate efficacy in soybean. All experiments were completed six times during a 2 yr period (2014, 2015) in fields previously confirmed with GR horseweed. Applications from 0900 to 2100 hours provided optimal control of GR horseweed 8 WAA. Soybean yield paralleled GR horseweed control with the highest yield of 3000kgha−1at 1500 hours, and the lowest yield of 2400kgha−1at 0600 hours. The height and density of GR horseweed at application had minimal effect on saflufenacil efficacy. Saflufenacil provided>99% control of GR horseweed when applied to small plants and low densities; however, control decreased to 95% when>25 cm tall, and to 96% in densities>800 plants m−2at 6 WAA due to some plant regrowth. TOD of application had a greater influence on GR horseweed control with saflufenacil than height or density. To optimize control of GR horseweed, saflufenacil should be applied during daytime hours to small plants at low densities. Optimizing GR horseweed control minimizes weed seed return and weed interference.

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Section: Resultsmentioning

confidence: 99%

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confidence: 93%