Maize Dwarf Mosaic Virus. This virus occurs on corn planted after July 1. The virus is transmitted by aphids. For control, keep fields as weed-free as possible, maintain strict aphid control, and plant resistant varieties for fall harvest. Resistant varieties include Seneca 258, Enforcer, Bi-Guard, and Silverette.
Some varieties exhibit more susceptibility than other varieties.
Select more resistant varieties where the disease is troublesome. To further assist in control of smut, control corn borers as first tassel appears. Begin when lesions first appear. Most years, chemical control is not needed for these diseases. Rust occasionally can become troublesome with some varieties.