Description: Maize dwarf mosaic is a virus disease recognized as a mottling or mosaic of light and dark green areas in young leaves within the whorl. Later plants may develop leaves that are yellowed or reddened and plants may be stunted, but these later symptoms are not characteristic for diagnosis.

Location: Maize dwarf mosaic occurs in river bottom fields where johnsongrass occurs in southern Ohio.

Time of attack: The virus overwinter in johnson-grass. Aphids feeding on johnsongrass transmit the maize dwarf mosaic virus to young plants. Symptoms may develop on young plants, but diseased plants are easier to diagnose in the mid to late whorl stages of development than later in the season.

Management:
· Resistant hybrids
· Destroy johnsongrass