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Growth Stage Cutoffs for Herbicide Applications in Corn (06/18/20)

The recent warm weather has led to rapid growth and development of many of our crops, including corn.

The recent warm weather has led to rapid growth and development of many of our crops, including corn. We have not had many good spray days due to windy conditions, but many corn fields are rapidly approaching the 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 the “When to Apply” column on pages 24 through 26 in the 2020 NDSU Weed Control guide for height and growth stage restrictions of postemergence herbicides in corn.

 

Joe Ikley

Extension Weed Specialist

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