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Interactions Between Maize Mosaic and Maize Stripe Viruses in Their Insect Vector, Peregrinus maidis, and in Maize. E. D. Ammar, Visiting professor, Department of Entomology, The Ohio State University (OSU), Ohio Agricultural Research and Development Center (OARDC), Wooster 44691; R. E. Gingery(2), and L. R. Nault(3). (2)Research chemist, U. S. Department of Agriculture, Agricultural Research Service (USDA-ARS), Department of Plant Pathology, OSU-OARDC, Wooster 44691; (3)Professor, Department of Entomology, OSU-OARDC, Wooster 44691. Phytopathology 77:1051-1056. Accepted for publication 14 January 1987. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1987. DOI: 10.1094/Phyto-77-1051.

Interactions between maize mosaic virus (MMV) and maize stripe virus (MStpV) were studied in two cultivars of maize 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 Golden Cross Bantam and at a temperature of 25.5 C than at 3233 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 014 days before or after access to MStpV-infected plants significantly reduced the fraction of insects transmitting MStpV. Also, MStpV transmission 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.