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S-metolachlor Products Approved in Sugarbeet (04/30/20)

Sugarbeet planting is underway in North Dakota and Minnesota. S-metolachlor products are used in sugarbeet for control of Amaranth species including waterhemp.

Sugarbeet planting is underway in North Dakota and Minnesota. S-metolachlor products are used in sugarbeet for control of Amaranth species including waterhemp. Dual Magnum is registered preplant or preemergence in sugarbeet by a section 24(c) special local needs label in sugarbeet in Minnesota and North Dakota. Use Dual Magnum at rates from 0.5 to 1 pt/A depending on organic matter and soil texture. Research conducted at NDSU / UMN indicates % OM in fields determines the use rate. Use Dual Magnum at 0.75 to 1 pt/A only when % OM in fields is greater than 3.5.

S-metolachlor products are labeled postemergence, once sugarbeet reach the two-leaf stage in sugarbeet for residual control of broadleaf weeds including common waterhemp. The ‘S’ in S-metolachlor is not a reference to a safener but is reference to the resolved isomer or active isomer of metolachlor (S-metolachlor). A list of S-metolachlor products approved in sugarbeet follow. Some S-metolachlor plus benoxacor safen products are approved in sugarbeet although benoxacor does not provide benefit in sugarbeet. Use S-metolachlor at rates ranging from 1 to 1.25 pt in a single or layered application once sugarbeet reach the 2-lf stage. The second application should follow 17 days after the first application in a layered application or no later than the 8-lf stage. Please read and follow all label directions before use.

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Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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