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Precipitation Means another Flush of Waterhemp (06/16/16)

Precipitation this week in the southern Red River Valley and west central Minnesota was/is very welcome.

Precipitation Means another Flush of Waterhemp

Precipitation this week in the southern Red River Valley and west central Minnesota was/is very welcome. However, precipitation may also produce another flush of waterhemp in row crop fields. Waterhemp will continue to germinate and emerge in low lying areas or in open areas of the crop canopy in June, July and in early August in response to rainfall events. Variable crop growth stage in fields exacerbates the challenge. A few thoughts and ideas:

•     Continue to scout fields, especially following rainfall events. Focus first on low lying areas including ditches.

•     Scouting is especially important for growers that implement postemergence only weeds management strategies. Don’t assume waterhemp cannot germinate and emerge in a closed canopy.

•     Don’t compromise. Set an expectation for complete waterhemp control and zero tolerance for waterhemp escapes that produce new seeds deposited into the seedbank.

Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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