Maize Dwarf MosiacCORN109.JPG

Maize dwarf mosaic virus

Area of impact: Leaves and ears

Description: Begins as pale spots and streaks that later develop into a mottled or mosaic pattern. Growth may be stunted, upper internodes may be shortened, ear formation may slow and excessive tillering may be present.

Pathogen involved: Virus

Timing/Conditions: Transmitted by aphids or by leaf rubbing. Symptoms occur six weeks after the virus is transmitted. Prefers average to warm temperatures.

Contributing factors: Nearby infected johnsongrass.

Management practices: Select tolerant commercial hybrids, avoid aphids and control johnsongrass with herbicides.

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