Abstract
(...) In 1984 and the early plantings of 1985 and 1986, there was little change in b over time. In the late plantings, however, b increased (indicating steeper gradients) between 14 and 21 days after release. At ∼21 days after release, the distance at which y declined to 0.10 (10 %) ranged from 124 to 525 cm. The rates of increase in y over time for the entire plots and at selected distances from the release point were measured using the apparent infection rate (r). There was no discernible effect of distance from the source on r. The r parameter consistently declined over time. Results indicate that MCDV spread can be substantial when viruliferous leafhoppers are introduced into a field of susceptible maize
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