Abstract
Three isolates ofPrunus necrotic ringspot virus (PNRV) causing line pattern in rose and one causing yellow mosaic were compared on four greenhouse and on five outdoor rose cultivars with an isolate of the virus causing Stecklenberger disease in morello and with an isolate of apple mosaic virus (AMV) from apple.
All PNRV isolates were readily transmissible through budding in rose (up to 100%). AMV was hard to transmit from apple to rose, but as easily from rose to rose as the PNRV isolates. In the greenhouse, first symptoms were produced 28 days after budding. Budding of outdoor roses in early September usually gave first symtoms next spring, but sometimes not until late during the second year after budding. In the course of time symptom production was erratic and often on a few leaves only.
Nature and severity of symptoms greatly depended on cultivar and to a lesser extent on the isolate used. Symtomatologically all isolates, including AMV, behaved like members of a continuum, with AMV in certain cultivars causing characteristic rose (yellow) mosaic but usually being more virulent on rose.
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Bos, L. Symptom expression and variation of rose mosaic. Neth. J. Pl. Path. 82, 239–249 (1976). https://doi.org/10.1007/BF03041379
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DOI: https://doi.org/10.1007/BF03041379