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Group 2 Herbicide Resistance – ND Update (06/02/16)

Another herbicide resistance issue was identified in 2015.

Group 2 Herbicide Resistance – ND Update

Another herbicide resistance issue was identified in 2015. A grower sprayed his wheat with Starane Flex and Varro, but redroot pigweed was not controlled. We know Starane provides little activity on pigweed, but pigweed is normally controlled by Group 2 herbicides (see bottom half of picture). Seed was collected in late summer of 2015. In a greenhouse screen, the pigweed was not controlled by Everest or Varro and only suppressed slightly by Starane Flex and Affinity BS (see top half of picture). It is interesting that the pigweed was still susceptible to Ally, GoldSky, and PerfectMatch. In other greenhouse treatments where we sprayed these same Group 2 herbicides with 2,4-D, the pigweed was controlled. Thus, we recommend adding another mode of action to the tank (e.g., 2,4-D) to control weeds in wheat and not rely solely on Group 2 herbicides. Having multiple modes of action will help delay or avoid resistance.

wdsci.jenks

Brian Jenks

Weed scientist, North Central R&E Center, Minot

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