Integrated Crop Management News

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We have received several calls regarding suspected fomesafen carryover injury to corn. Fomesafen is a group 14 herbicide (PPO inhibitor), and the active ingredient in Reflex, Flexstar, Prefix, Marvel and other products. Carryover is typically associated with applications made after late June and/or when the season turns dry following application. Labels of most products containing fomesafen specify a 10-month rotation interval for planting corn. The primary symptom of fomesafen injury is striped leaves due to chlorotic or necrotic veins on the leaves. Other factors can cause striping on leaves, but fomesafen is unique in that the veins are affected rather than interveinal tissue. Some of the leaves may fold over midway due to loss of integrity of the leaf midvein.

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Iowa State University



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