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Metolachlor VS. S-Metolachlor (05/04/17)

A very common question referenced ‘generic metolachlor’ in winter meetings. The conversation went something like this….’I really like the price point for ‘product xyz’ and I wonder if I can use it in sugarbeet.’ I have a five-part answer:

Metolachlor VS. S-Metolachlor

A very common question referenced ‘generic metolachlor’ in winter meetings. The conversation went something like this….’I really like the price point for ‘product xyz’ and I wonder if I can use it in sugarbeet.’ I have a five-part answer:

• Is product approved for sugarbeet? We need to check the label.

• ‘S’ in S-metolachlor is not a reference to safener. It’s a reference to the active isomer or the resolved isomer of metolachlor (S-metolachlor). Formulation may impact use rate and price point.

• There are several S-metolachlor products manufactured by Syngenta and distributed by Winfield, Tenkoz, and Dupont to name a few. There also are several generic metolachlor products.

• Adjust the rate when considering a metolachlor product (remember Dual) since the unresolved blend contains forms of metolachlor that are less active than the isomers contained in S-metolachlor (Dual Magnum).

• There are S-metolachlor (or metolachlor) products and S-metolachlor plus benoxacor safen (or metolachlor plus benoxacor safen) products. Safen products generally are used in corn.

 

Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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