Written by Charlotte Cunningham
Practical glyphosate application guidelines have been published by the Weed Resistance Action Group (WRAG), which aims to help arable growers reduce the increasing risk of glyphosate resistance developing in grass weeds. Charlotte Cunningham reports. The guidelines have been updated this year following five years of ADAS research into optimising the effectiveness of glyphosate on arable weeds. Although resistance to glyphosate has not yet developed in the UK, evidence has started to emerge that certain grass weed populations, such as sterile brome, are becoming more tolerant to its effects. A key concern now for researchers is to keep glyphosate within the grower’s toolbox for as long as possible. In 2015, experts from the research and advice community, Crop Protection Association, agrochemical industry and public sector came together to form the Weed Resistance Action Group (WRAG) to independently investigate agricultural over-dependence on glyphosate. Following WRAG’s initial glyphosate resistance guidelines published in 2015, AHDB and industry funded research began to quantify exactly how and when glyphosate should be used for maximum effectiveness. Timing and application In September 2020, work finished on the five-year study to investigate timing and application precision. Multiple experiments varying glyphosate rates and timings were administered across two of the…
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