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Correction to Weed Guide (05/04/17)

Question: I have been getting questions left and right about Absinth wormwood control in pastures. I understand that there are recommendations in the ND Weed Guide that are not correct. What is the best time to control this weed, and what products/rates do we need to be using?

Correction to Weed Guide

Question: I have been getting questions left and right about Absinth wormwood control in pastures. I understand that there are recommendations in the ND Weed Guide that are not correct. What is the best time to control this weed, and what products/rates do we need to be using?

Answer: Refer to page 65 in the ND Weed Control Guide. There is one sentence under “When to Apply” in the Absinth Wormwood section that is incorrect. Strike out the second sentence “Herbicides applied in late-June to mid-August have given greater residual control than fall or spring applications.” That recommendation is false. Early spring and fall are the best times to apply herbicide to control absinth. The rest of the section is correct.

For control in pasture and non-crop, Tordon at ½ pint/A is still the most cost-effective and should be applied when the plants are about 12 inches tall. Milestone and Curtail work very well, but the use rate and cost are higher than for Tordon. Method and Perspective also have low use rates and are very effective, but you cannot use them if the land is hayed or grazed. 2,4-D is effective but rates at least 4 pt/A is required.

Rod Lym

NDSU Weed Science, Noxious and Invasive Weeds

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