Les Lewis and Bob Gunnarson of the USDA Corn Insects Research Laboratory in Ames conducted a survey of the European com borer population in central Iowa and found that the population has suffered high mortality. The percent mortality from four central Iowa counties was 51 percent (Franklin County), 37 percent (Hardin County), 40 percent (Marshall County), and 50 percent (Story County). These larvae died from the fungus, Beauveria bassiana.