Take waterhemp battle to beets

Glyphosate-resistant waterhemp can be managed in Roundup Ready sugarbeets.

Jeff Stachler, University of Minnesota and North Dakota State University sugarbeet weed specialist; and Al Cattanach, Mark Bredehoeft and Mike Metzger, agronomists from the sugarbeet cooperatives, recommend the following program:

Fewer than 20 plants

If fewer than 20 waterhemp plants, or a single small patch of waterhemp, have survived glyphosate in a field for the past two years, they suggest applying Betamix (12 fluid ounces per acre) plus Nortron (4.0 fluid ounces per acre) plus glyphosate (0.984 pound acid equivalent per acre) {lb. ae/A} [Roundup PowerMax (28 fl. oz./A)] plus Destiny HC, Savvy, Loveland’s MSO with Leci-tech technology, or any other high-quality, tested and proven high-surfactant oil concentrate (HSOC) that is MSO based and reduces antagonism with glyphosate at a rate of 1.5 to 2.0 pints per acre to cotyledon sugarbeet.

Key Points

Specialists offer a specific program for waterhemp control in beets.

Different plans are needed for low and high waterhemp densities.

Adjust herbcide rates for coarser soils and those with lower organic matter.


At the two-leaf stage of sugarbeet, apply Betamix (12 fl. oz./A) plus Nortron (4.0 fl. oz./A) plus Outlook (14 fl. oz./A) or Dual Magnum (1.5 pt./A) plus glyphosate (0.984 lb. ae/A) [Roundup PowerMax (28 fl. oz./A)] plus Destiny HC, Savvy, Loveland’s MSO with Leci-tech technology, or similar MSO product (1.5 to 2.0 pt./A).

As soon as the sugarbeet stage is greater than eight leaves, apply Betamix (16 fl. oz./A) plus Nortron (4.0 fl. oz./A) plus Outlook (10 fl. oz./A) or Dual Magnum (1.0 pt./A) plus glyphosate at 0.75 lb. ae/A [Roundup PowerMax (22 fl. oz./A)] plus Destiny HC, Savvy, Loveland’s MSO with Leci-tech technology, or similar MSO product (1.5 to 2.0 pt./A).

At 10 to 14 days after this last application, scout the field to determine the need for a fourth application of glyphosate (0.75 lb. ae/A) plus Betamix (24 fl. oz./A) plus Destiny HC, Savvy, Loveland’s MSO with Leci-tech technology, or similar MSO product (1.5 to 2.0 pt./A). Other options to consider at 10 to 14 days after the third postemergence application include row cultivation, hand labor, or row cultivation plus hand labor.

High density

If the glyphosate-resistant waterhemp density exceeds 20 plants per field, then Nortron (7.5 pt./A) should be incorporated prior to planting. Apply the same postemergence treatments as above, beginning when waterhemp plants are in the cotyledon stage of development.

If this first postemergence application is applied at or shortly after the two-leaf stage of sugarbeet, start by applying the two-leaf treatment listed above.

Apply all subsequent applications every 14 days as necessary, always applying the highest legal rate of Betamix based upon the stage of the sugarbeet, and do not apply greater than 12 fl. oz./A of Nortron postemergence for the season. Ro-Neet SB (5.3 pt./A) can be incorporated or Dual Magnum (1 to 2 pt./A) can be applied preemergence instead of Nortron due to lower herbicide cost and similar control of waterhemp. If Nortron, Ro-Neet or Dual Magnum is applied to the soil in a band, row cultivation and hand labor will be required to maximize waterhemp control.

Soil adjustments

The agronomists have suggested specific rates for Dual Magnum, Nortron and Ro-Neet for fine-textured and high-organic-matter soils. If the soil type in the field is coarser and is low in organic matter, the rate of these products needs to be adjusted accordingly.

Source: NDSU Extension Communications

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CLEAN BEETS: Keep Roundup Ready sugarbeets clean with a program designed to control glyphosate-resistant waterhemp.

This article published in the May, 2012 edition of DAKOTA FARMER.

All rights reserved. Copyright Farm Progress Cos. 2012.