Information Management to Maximize Your Yields

Does a yellow flag in corn mean surrender?

Not yet! The symptoms you are seeing in your corn fields are called Rapid Growth Syndrome (RGS). It should not be a concern as it will dissipate in about 3-4 days and will likely have little effect on yield.


Rapid Growth Syndrome describes a situation where random plants across a corn field in the uppermost plant leaves are tightly rolled and do not unfurl normally. The last leaf may fail to unfurl, and it may further wrap or twist.

Lower leaves are not affected, but the whorl at the top of the plant is tightly wrapped and it may bend over at a right angle to the ground. Within a week, twisted leaves usually unfurl and affected plants resume normal growth.


Younger leaves that were trapped inside the whorl may emerge as pale green or yellow because they were shaded for an extended period of time and could not photosynthesize. Within a few weeks, the only evidence that remains of RGS is the crinkled appearance of the most tightly wrapped leaves.

Rapid Growth Syndrome most often appears between the V5 and early V6 growth stages. The appearance of RGS in any given year is not uncommon.

Yield Impacts

Periods of twisted growth that are caused by weather usually do not affect yield potential. Plants affected by RGS may cause initial concern, but should grow out of most symptoms. By the time corn height reaches chest high, the only evidence of RGS may be a crinkled appearance on the most affected leaves.

For more information in Rapid Growth Syndrome, contact your SciMax specialist.




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