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Nematodes can cause substantial damage to corn, reports plant pathologist Greg Tylka, Iowa State University (ISU). If growers suspect nematode damage, they can have soil samples tested and use seed treatments such as Syngenta's Avicta to control nematodes in the future. Send 12-in. soil samples and root balls to ISU Plant and Insect Diagnostic Clinic, 327 Bessie Hall, Ames, IA 50011.