Abstract
Early emerged adults (males and females) or last instar nymphs (males, females, or males and females together) of the leafhopper Graminella nigrifrons were allowed to acquire maize chlorotic dwarf virus (MCDV) from corn or johnsongrass source plants positioned in the center of maize plots in 1990. In 1991, two planting dates of maize were tested by using newly emerged adult males, females, or males and females. After leafhopper acquisition and potential flight to other plants, disease incidence was assessed throughout the plots. The log-logistic model provided an acceptable fit to the observed disease gradients (.)
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