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Influence of Light Quality on Translocation of Tomato Yellow Top Virus and Potato Leaf Roll Virus in Lycopersicon peruvianum and Some of its Tomato Hybrids. P. E. Thomas, Research plant pathologist, Agricultural Research Service, U.S. Department of Agriculture, Washington State University; Sher Hassan(2), and G. I. Mink(3). (2)Graduate student, Department of Plant Pathology, Washington State University; (3)Plant pathologist, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350. Phytopathology 78:1160-1164. Accepted for publication 4 April 1988. 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, 1988. DOI: 10.1094/Phyto-78-1160.

Green peach aphids (Myzus persicae) could not recover tomato yellow top virus (TYTV) or potato leaf roll virus (PLRV) from Lycopersicon peruvianum, U.S. Department of Agriculture Plant Introduction 128655, and some of its hybrid progenies after they were aphid inoculated as seedlings with the same viruses in a glasshouse. After these plants were graft inoculated, however, aphids routinely recovered TYTV and PLRV from some plants but not others. The infected plants were tolerant (asymptomatic). Their apparent immunity to infection by aphid inoculation was expressed in a glasshouse or in direct sunlight but not in houses covered with a translucent fiberglass material. Virus could be recovered from tolerant plants inoculated by aphids in a glasshouse but only after they were transferred to and incubated in a fiberglass house. The transfer could be delayed at least 8 wk after aphid inoculation without affecting the eventual recovery of virus. Virus could not be recovered from new growth of some tolerant plants infected by graft inoculation after the plants were severed from the infected graft scion. Similarly, virus could not be recovered from new growth of some plants infected by aphid inoculation in the fiberglass house after the plants were transferred to the glasshouse. These results are explicable on the basis that a virus transport function that controls release of virus from initially infected cells was completely or partially inhibited in the glasshouse.