Corn Growth Stage and Post-Emergence Herbicides

ifr180601–143
Corn Growth Stage and Post-Emergence Herbicides
Aaron Hager, Extension Weed Scientist - University of Illinois

The month of May was one of the warmest on record across the Midwest. That heat has the corn crop growing really fast. As Todd Gleason reports, this means farmers will be short on time to get post-emergence herbicide applications done.

The labels of most post-emergence corn…
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The labels of most post-emergence corn herbicides allow applications at various crop growth stages, but almost all product labels also indicate a maximum growth stage beyond which broadcast applications should not be made says University of Illinois Weed Scientist Aaron Hager.

Hager :15 …twelve inch corn cutoff height.

For product labels that indicate a specific corn height and growth state, Hager says farmers should be sure to follow the more restrictive of the two.

Hager :18 …go with the development stage instead of the corn height.

The weed scientist explains that application restrictions exist for several reasons, but of particular importance is the increased likelihood of crop injury if applications are made outside a specified growth stage or range.