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Maize Dwarf Mosaic


© Purdue University, Plant and Pest Diagnostic Laboratory

Pathogen(s) causing disease:

Maize dwarf mosaic virus (MDMV) strain A or B

Symptoms:

Early infection results in chlorotic spots or flecks that elongate in young leaves in the whorl. Flecks merge into chlorotic streaks along the leaves. These streaks form mosaic or mottled patterns and may turn to a general yellowing as the growing season progresses. Later, plants may have blotches or streaks of red that generally appear after periods of cool (60°F) night temperatures. Infected plants are predisposed to root rot and may be barren.

Conditions:

Those favorable to aphids and growth of Johnsongrass in fields.

Management:

Grow hybrids tolerant or resistant to maize dwarf mosaic. There is good tolerance and resistance to strain A, but only fair tolerance and no resistance to strain B in dent corn. Control rhizome Johnsongrass or other overwintering weed hosts.

Sources:

Purdue University
The Ohio State University

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