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Controlling Emerged Waterhemp in Sugarbeet (05/07/20)

hursday’s weather is much improved, and you elect to observe emergence patterns in sugarbeet fields. Unfortunately, along with sugarbeet you observe short and wide cotyledons (I call them row boats) that can only be waterhemp. What are your waterhemp control options in sugarbeet?

Thursday’s weather is much improved, and you elect to observe emergence patterns in sugarbeet fields. Unfortunately, along with sugarbeet you observe short and wide cotyledons (I call them row boats) that can only be waterhemp. What are your waterhemp control options in sugarbeet?

First, you must be proactive. Waterhemp populations are mixture of susceptible and resistant biotypes in agricultural fields. It is much easier to control waterhemp populations with resistant alleles when waterhemp is small. I recommend glyphosate at 32 fl oz/A plus ethofumesate at 6 fl oz/A applied through flat fan nozzles using a small droplet spectrum to ensure contact with small weeds. Second option is for producers with access to Betamix. Betamix rate is commensurate with sugarbeet size and likely will range from 12 to 16 fl oz/A. The third option is inter-row cultivation to remove waterhemp as early as possible without damaging sugarbeet stand.

Continue to follow the sugarbeet weed management plan including use of soil residual herbicides postemergence to sugarbeet and preemergence to waterhemp once sugarbeet research the 2-lf stage.

wdsci.3

Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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