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Controlling Seedling Alfalfa in Sugarbeet (05/25/17)

Field Agronomists have observed a greater than normal occurrence of seedling alfalfa in row crop fields.

Controlling Seedling Alfalfa in Sugarbeet

Field Agronomists have observed a greater than normal occurrence of seedling alfalfa in row crop fields. As it turns out, alfalfa may have been a boxcar contaminant with fertilizer. Thus, the question is, how do you control seedling alfalfa in row crops, including sugarbeet?

Pursuit and Raptor (imidazolinones) are registered for weed control in the establishment of alfalfa. However, there is some evidence that other ALS inhibitor (SOA2) families (sulfonylureas or triazolopyrimidines) may have activity on alfalfa. In sugarbeet, UpBeet may control seedling alfalfa, especially when it is small.

The best option in sugarbeet might be Stinger, as clopyralid is effective on legumes and three other botanical families including composite, solanaceae/nightshade, and polygonum.

Tom Peters

Extension Sugarbeet Agronomist

NDSU & U of MN

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