Interactions Between Maize Mosaic and Maize Stripe Viruses in Their Insect Vector,Peregrinus maidis,and in Maize

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Abstract
Interactions between maize mosaic virus (MMV) and maize stripe virus (MStpV) were studied in two cultivars of maize [Zea mays] and in two biotypes of the planthopper vector. Peregrinus maidis. Plants previously infected with either virus were partially protected from infection by the other. This interference was more consistent in cultivar Aristogold Bantam Evergreen than in cultivar Goldeb Bantam and at a temperature of 25.5.degree. C than at 32-33.degree. C. As judged by enzyme-linked immunosorbent assay, the concentration of MStpV antigen was usually higher in plants infected by MStpV alone than it was in plants also infected with MMV. In both P. maidis biotypes, access to MMV-infected plants within 0-14 days before or after access to MStpV-infected plants significantly reduced the fraction of insects transmitting MStpV. Also, MStpV transmissions was significantly delayed in insects exposed to both viruses. In contrast, access to MStpV-infected plants usually had no effect on the acquisition and transmission of MMV.