Much of the state has experienced below normal temperatures along with wet soils the past few weeks. These conditions not only slow the growth of corn, it also alters plant development. Corn is likely to be more responsive to herbicides under these conditions. We are seeing an increased response to postemergence herbicides. This is likely due to changes in the cuticle that allow greater movement of chemicals from the leaf surface into the leaf.
Iowa State University
Hartzler, Robert G., "Corn Response to Postemergence Treatments" (2009). Integrated Crop Management News. 643.
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