Abstract
Maize chlorotic dwarf virus (MCDV), an isometric virus associated with a stunting disease of maize, has a semipersistent relationship with its leafhopper vector, Graminella nigrifrons (Forbes). Leafhopper’s lose their ability to transmit MCDV within 48 h after virus is acquired. Leafhoppers given a 96-h virus-acquisition access period (AAP) were more efficient vectors than leafhoppers given a 24-h AAP. The leafhoppers can transmit MCDV following a 2-h AAP and a 2-h inculation period. None of 100 nymphs which previously fed on infected corn and then molted transmitted MCDV, whereas 25 of 100 nonmolted nymphs transmitted virus. Both adult males and females transmit MCDV. The leafhopper Deltocephalus sonorus Ball also is a vector of MCDV, although it is inefficient when compared to G. nigrifrons . The leafhoppers, Dalbulus elimatus (Ball), D. maidis DeLong and Wolcott, and Macrosteles fasifrons (Stal), failed to transmit MCDV.
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