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Growth Stage Cutoffs for Herbicide Applications in Corn (06/20/19)

Side-dressing and herbicide applications are being made on many corn acres this week.

Side-dressing and herbicide applications are being made on many corn acres this week. Despite overall cool conditions this growing season, corn should be nearing the rapid growth phase in many fields. This is a good time for a reminder of growth stage and height-restriction cutoffs for postemergence corn herbicides. Some of the earliest cutoff timings are 8-inch corn for broadcast applications of 2,4-D, and any atrazine must be applied before corn reaches 12-inches in height. If corn is 12- inches or taller, the atrazine must be left out of the tank. See pages 18 and 19 in the 2019 NDSU Weed Control guide for height and growth stage restrictions of postemergence herbicides in corn (https://www.ag.ndsu.edu/weeds/weed-control-guides/nd-weed-control-guide-1/wcg-files/4-Corn.pdf).

 

Joe Ikley

Extension Weed Specialist

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