Fast-growing corn in the last week has resulted in a few scattered plants in some fields - at least in central and west-central Iowa - displaying bright yellow leaves waving above the canopy (see photo). Corn with these symptoms is around the V5 to V8 growth stage. The yellow upper corn leaves are sun-starved, entrapped earlier in the whorl by more mature leaves. They will wave for a day or more above rapidly growing crop canopies before turning green.
Iowa State University
Elmore, Roger W. and Licht, Mark A., "Twisted whorls and yellow leafs" (2012). Integrated Crop Management News. 206.
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