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Rapid Growth Syndrome
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.
Twisted whorls, buggy whipping, yellow leaves
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.
Twisted whorls and yellow leafs
Corn producers might see yellowing leaves above the canopy. The symptom is not unusual in fast-growing corn; leaves should unfurl and turn turn green within a few days.
Yellow Leaves Emerge from Twisted Whorls - 2011
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.
Twisted Whorls - 2009
By Roger Elmore and Lori Abendroth, Department of Agronomy