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Ethofumesate Applied Preplant or Preemergence in Sugarbeet (04/30/20)

Ethofumesate is registered for preplant, preemergence, and postemergence control of grasses and broadleaf weeds in sugarbeet.

Ethofumesate is registered for preplant, preemergence, and postemergence control of grasses and broadleaf weeds in sugarbeet. Ethofumesate was first registered by Fisons Corporation as ‘Nortron’ in 1977 at rates soil applied to 7.5 pt/A. Ethofumesate has evolved into one of our most important and versatile herbicides and is currently sold using the brand names ‘Nortron’, ‘Ethotron’ and ‘Ethofumesate 4SC’.

Ethofumesate applied at rates to 3 pt/A provides up to 4 weeks of waterhemp control and provides season long waterhemp control when applied in a program approach with chloroacetamide herbicides (S-metolachlor, Outlook and Warrant). Ethofumesate is relatively water insoluble and needs approximately 0.75” rainfall to activate when applied preemergence. Ethofumesate at 2 to 3 pt/A may reduce nurse crop stands especially when rainfall occurs immediately following seeding. We are confident small grains can follow ethofumesate at rates to 3 pt/A in sugarbeet.

Apply ethofumesate at rates from 4 to 7.5 pt/A depending on soil texture and soil organic matter. Ethofumesate at 5 to 7.5 pt/A controls kochia and provides 8 to 10 weeks waterhemp control. However, ethofumesate at rates greater than 2 pt/A will significantly injure / kill nurse crops. We recommend broadleaf crops only follow ethofumesate at rates greater than 5 pt/A.

Ethofumesate rate and activation method depends on your weed control challenges. Soil applied options across rates are effective for waterhemp control but only high ethofumesate rates control kochia. Likewise, for kochia control we recommend preplant application and light incorporation (depth of 2” or less) since kochia emergence will be immediate and may escape PRE ethofumesate application. Ethofumesate targeting waterhemp can be applied preplant or preemergence since waterhemp germinates and emerges after May 15 in our region. Apply ethofumesate preemergence in 15 gallons of water using medium to course droplets. Always follow label directions.

 

Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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