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Waterhemp Control in Sugarbeet Fields to be Planted (05/07/20)

Slightly more than half of the 2020 sugarbeet crop has been planted in Minnesota and North Dakota as of Tuesday, May 5, 2020.

Slightly more than half of the 2020 sugarbeet crop has been planted in Minnesota and North Dakota as of Tuesday, May 5, 2020. We highly recommend a preplant or preemergence herbicide if you are a sugarbeet grower, have not completed sugarbeet planting, and identify waterhemp as your most important weed control challenge. We previously recommended a preemergence herbicide to provide a short-term layer of control for early germination pigweed including waterhemp until the layby program can be implemented. However, preemergence herbicides require rainfall for activation. A query of Fargo climate data from 1881 to 2014 by Daryl Ritchison, Director of the North Dakota Agricultural Weather Network (NDAWN) concludes only three days during the month of May with precipitation at 0.25 inch or greater. Those odds are not good enough especially since waterhemp emergence has been reported in four counties in Minnesota and North Dakota in 2020. We need immediate activation.

We recommend the use of Ro-Neet, Eptam, ethofumesate, or Dual Magnum using the 24c local needs label preplant and activated with tillage. Follow label directions for application of Ro-Neet and Eptam including incorporation immediately following application due to volatility. We recommend ethofumesate at 1 to 3 pint/A alone or ethofumesate at 2 pt/A in combination with Dual Magnum at 0.5 to 0.75 pt/A preplant. Dual Magnum can be applied alone at 0.5 to 1 pt/A. We recommend Dual Magnum at 1 pt/A on soils with greater than 3.5% organic matter.

 

Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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