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Rapid Growth Syndrome

Encyclopedia Article

Rapid growth syndrome is a phenomenon where corn leaves don’t unfurl properly and the whorl becomes twisted or tightly wrapped. It usually occurs in 5th to 7th leaf corn but can also occur as late as 12th leaf corn. This is also described as buggy whipping, twisted whorls, wrapped whorls, accelerated growth syndrome, roping, and onion leafing.

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Twisted whorls, buggy whipping, yellow leaves

June 6, 2018 10:01 AM
Blog Post

Over the last week there have been sightings of twisted whorls and buggy whipping or corn leaves. It’s also known as rapid growth syndrome, accelerated growth syndrome, roping, wrapped whorls, and onion leafing, This is not unusual for corn that is growing rapidly and usually occurs in 5th to 7th leaf corn but can also occur as late as 12th leaf corn. Most of the time this occurrence is due to rapid growth as plants benefit from warm temperatures, rainfall after being dry, or development of nodal roots.

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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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