Abstract
Nault and DeLong (1980) introduced evidence to support the co-evolution of leafhoppers in the genus Dalbulus DeLong (1950) with maize (Zea mays L.) and its ancestors. Due to its close relationship with maize, the corn leafhopper, Dalbulus maidis (DeLong and Wolcott) has become an economically important pest because it not only causes feeding damage to corn (Bushing and Borton, 1974), but it also can transmit three important corn disease agents, the corn stunt spiroplasma (CSS), maize bushy stunt mycoplasma (MBSM), and maize rayado fino virus (MRFV) (Nault and Knoke, 1981). Two of these diseases, CSS and MRFV, were associated with the outbreak of a disease complex resulting in a loss of the $60 million hybrid seed production and breeding nurseries in southern Florida in 1979 and 1980 (Bradfute et al., 1981; Niblett et al., 1981).
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