Get Rid of those Large Weeds in Soybeans and Other Crops (6/7/12)
In Roundup Ready soybean fields with large weeds, apply glyphosate at 1.5 pounds acid equivalent/acre (Roundup PowerMAX at 44 fl oz/acre) as soon as possible. Add a non-ionic surfactant at 0.25 % v/v, unless the label prohibits the addition, plus AMS at 8.5 lb/100 gallon of spray. Tank-mixtures may be effective, but not likely with large weeds. Consult the North Dakota Weed Control Guide for additional information.
Do not allow any weeds to survive the herbicide application and be sure to wait 10 to 14 days before the second glyphosate application if weeds have survived the first application.
NDSU and U of MN Extension Agronomist – Sugarbeet/Weed Science