Herbicide Injury on Corn

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

I have seen a lot of herbicide injury on corn this year, more so than the last few years. In the month of May we had a lot of cool weather and overcast days which slows the corn plants’ ability to metabolize the herbicide and increases the risk of crop injury. The average temperature during May in 2019 was 67 °F while in 2020 for the same month was 60 °F. As usual, most of the crops are starting to grow out of the injury.

So when troubleshooting possible herbicide injury and its severity, consider how weather could have impacted the problem.

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