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Yellow Leaves Emerge from Twisted Whorls - 2011

June 22, 2011
Yellow leaves resulting from twisted whorls associated with an application of a growth regulator herbicide

By Roger Elmore, Department of Agronomy

Yellow leaves wave above V5 to V8 corn canopies in northern and central Iowa this week.   These sun-starved leaves freshly emerged from twisted whorls will turn green soon after they begin intercepting sunlight.

Potential causes are numerous:  rapid growth coupled with a wide range of temperatures, hail, strong winds or an application of a herbicide, insecticide or fungicide, etc. 

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