Northeast Research and Demonstration Farm
Straight-line winds as high as 60 mph caused considerable plant breakage, or greensnap, in corn across north-central and northeast Iowa on July 1, 2006. Damage occurred more frequently and at greater severity along a narrow band running from eastern Cerro Gordo County along county road B60 and across several counties to the east and northeast, including the ISU Northeast Research and Demonstration Farm. Greensnap was reported at 20 to 80% in various fields. The last experience with a major greensnap event in northern Iowa was during 1998.
Iowa State University
Elmore, Roger W.; Abendroth, Lori; and Pecinovsky, Kenneth T., "Corn Breakage (greensnap) in 2006 Related to Cropping System and Inputs" (2008). Iowa State Research Farm Progress Reports. 734.