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Maize dwarf mosaic  (maize dwarf mosaic virus or MDMV) has variable symptoms on sweet corn depending on plant age and variety. Early symptoms include chlorotic spots or streaks interspersed with healthy, green tissue. Leaves may become yellow or stunted later on; dwarfing (stunting) may be seen in susceptible varieties. Dwarfing of ears may also be seen in some cases. The pathogen can overwinter in several grasses, of which Johnsongrass is the major host. A number of aphid species transmit the virus from overwintering hosts to sweet corn.

Maize dwarf mosaic symptoms

(Photo: Paul Vincelli, University of Kentucky)

Management: 

• Resistant varieties (primary choice) and management of Johnsongrass.

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