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Vector Relations

Dependent Transmission by Aphids of Barley Yellow Dwarf Luteoviruses from Mixed Infections. W. F. Rochow, Research plant pathologist, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, and professor of plant pathology, Cornell University, Ithaca, NY 14853; Phytopathology 72:302-305. Accepted for publication 11 June 1981. 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, 1982. DOI: 10.1094/Phyto-72-302.

Dependent virus transmission by aphids occurred from seven of 14 double infections among five barley yellow dwarf luteoviruses in tests with four aphid species in 70 experiments. The RPV isolate was the best helper virus, enabling Rhopalosiphum padi to transmit RMV, MAV, and SGV, together with RPV, from most mixed infections. The PAV isolate was equally effective in enabling R. padi to transmit MAV, but somewhat less effective in enabling R. padi to transmit RMV. The RMV isolate was a helper virus in transmissions of RPV and MAV by R. maidis. Four of these seven systems involved interaction of serologically distinct viruses; three involved serologically related virus pairs. Dependent virus transmission did not occur from seven other double infections that included MAV, SGV, and RMV in tests with R. maidis, Macrosiphum (= Sitobion) avenae, and Schizaphis graminum. Enzyme immunosorbent assays were especially useful to identify viruses in the mixed infections.