Maize Dwarf Mosaic Virus (virus - maize dwarf mosaic virus (MDMV)): This is the most common and most damaging of corn viruses in Texas. Youngest leaves have a light to dark green mottle or mosaic in narrow streaks along veins. Plants are stunted (photo), excessively tillered, with multiple ear shoots and poor seed set. Early infection can lead to root and stalk rots and death. The virus is transmitted mechanically by at least 12 different aphids. Symptoms appear 30 days after emergence. Many wild and cultivated grasses serve as hosts for MDMV. Johnsongrass is considered the main overwintering reservoir. Use resistant hybrids and control Johnsongrass.
