Watch out for carryover
The most common corn injury symptom caused by fomesafen carryover is a whitening of the leaf veins, commonly referred to as veinal chlorosis (Figures 1 and 2). Affected areas of corn leaves often take on a striped appearance, can become necrotic, and tissue near the leaf midrib may totally collapse in that region. The root system of affected plants usually remains normal.
What does all of this mean for growers who are planning to plant corn in an area that received applications of fomesafen last year? I think it means that corn growers should be more aware of the higher potential for herbicide carryover injury that can occur, especially in areas that have experienced dry fall and winter conditions, or in fields that received late or higher amounts of fomesafen than usual. The best practice is to follow the rotational intervals listed on the labels of the herbicides used and to consider the herbicide use history of each field in relation to the factors discussed above. If several of these factors suggest a high probability of fomesafen carryover, then it's probably a good idea to stay away from corn in these fields during the 2012 growing season.