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Greensnap, also known as brittle snap, is the condition where rapidly growing stalks are broken by strong, sudden winds associated with thunderstorm downbursts. These types of strong winds are common in Iowa, and corn is most susceptible to greensnap when it is growing rapidly. Greensnap can occur as early as the 5^th to 8^th-leaf stages (10-24 inches in height) but tends to be more common from the 12^th leaf stage through tasseling stages. New cell walls are extremely fragile and need time to harden and develop.