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Questions on Herbicide Options for Potato (06/01/17) Rev (06/07/17)

Question: What preemergence herbicides can I use on potato if I want to plant sugarbeets next year?

Questions on Herbicide Options for Potato

Question: What preemergence herbicides can I usrobinson.1e on potato if I want to plant sugarbeets next year?

Answer: The only preemergence herbicides that do not have a sugarbeet rotation restriction are Dual (S/metolachlor) and Outlook (dimethenamid). All other preemergence potato herbicides do not allow sugarbeets to be planted the following crop season.

Addition 06/07/17:

The preemergence herbicides that do not have a sugarbeet rotation restriction are Dual (S/metolachlor), Outlook (dimethenamid), Chateau (flumioxazin) and Eptam. All other preemergence potato herbicides do not allow sugarbeets to be planted the following crop season.

Question: My potatoes are emerging, what herbicides can I use for weed control?

Answer: There are some options for postemergence herbicides for potato. Prowl H20 (pendimethalin) is approved to apply up to 6-inch-tall potato. Prowl will prevent weeds from emerging, but does not provide control of emerged weeds. Metribuzin is labelled for postemergence in most russet-skinned potatoes, but typically smooth skinned potatoes are sensitive to postemergence metribuzin. Check the label for specific restrictions. Matrix (rimsulfuorn) can be used up to 14-inch-tall potato. Matrix cannot be used on seed potato fields. Metribuzin and Matrix

will provide control of emerging weeds and small postemerged weeds. Use an oil adjuvant for postemergence weed control. For grass control Poast (sethoxydim) and Select (clethodim) can be used with an oil adjuvant.

Question: How do you control volunteer potato in soybean?

Answer: Herbicides such as Reflex (fomesafen), Raptor (imazamox), Roundup (glyphosate), and/or Clairty (dicamba) are the best options, depending on the soybean trait tolerance. Multiple treatments may need to be applied as volunteer potatoes likely will not be completely killed. Volunteer potatoes are a susceptible host for late blight, because they are not continually treated with fungicides.

Andy Robinson

NDSU/U of M Extension Potato Agronomist

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