Abstract
An ability to detect maize dwarf mosaic virus (MDMV) infections will help explain how MDM epidemics develop. Trap plant plots with and without diseased source plants, successive maize plantings, and grass weeds in tile plots were used to monitor MDM onset in northern Ohio. This area is outside the natural distribution of johnsongrass (Sorghum halepense), the overwintering host of MDMV-A. The average incidence of MDM in trap plants increased from 44 to 52% as the number of source plants placed at a 0.6-m distance from the trap plants increased from 25 to 100 plants (...)
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