Hail storms again devastated portions of Iowa’s corn crop on Aug. 9. Storms cut a 1 to 8 mile swath across north central Iowa. Producers in its path are asking, “How does hail after tasseling affect yield?” Most corn in the affected area was in the blister stage (R2). According to hail industry tables, complete leaf loss at R2 results in 73 percent yield loss (see table). Amount of leaf loss as well as development stage greatly impacts losses. For example, if half of the leaves are lost, yields are reduced by 22 percent. Damage at tasseling, VT, affects yield more severely while losses both earlier and later in development are less severe.
Iowa State University
Elmore, Roger W., "Corn Hail Loss Chart and Things to Consider Following Hail" (2009). Integrated Crop Management News. 588.
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