Flax Response to Preemergence Herbicides

(Research Report, Hettinger REC, November 2021)
Lead Author
Lead Author:
Caleb Dalley
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A trial was conducted to evaluate flax response to preemergence herbicides. Flax was planted on May 5, 2021 and herbicides treatments were applied on May 6. Flax emerged on May 18. Rainfall of 1.1 inches was recorded after planting and prior to flax emergence. Under these conditions, injury was observed with most treatments 21 days after flax emergence, with the high rate of Spartan plus Zidua and Outlook resulting in the greatest injury. For most treatments, injury was not visible at 31 and 38 days after emergence. However, the high rate of Zidua, the higher combination of Spartan plus Zidua, and Outlook treatments still resulted in moderate injury of flax. No treatment reduced flax stand, but there were differences in flax height due to herbicide treatment. However, differences in height were small and inconsistent with a range of 33 to 37 cm; however, flax height was lowest following application of Outlook. While there were differences in yield they were associated with both weed control and herbicide injury as common mallow emerged with the flax and competed with flax for the limited soil moisture resources available in 2021 due to drought conditions.