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Papaya ringspot virus-type P (PRSV-P) has been identified on papaya (papaw) in Australia for the first time. Outbreaks of the disease were recorded in south-east Queensland at Wamuran, Dayboro and Morayfield in the vicinity of Caboolture, in suburban Brisbane and at Beaudesert and Bundaberg during February and March 1991. Infected plants showed typical symptoms reported from other countries, including the characteristic ringspots on the fruit. Potyvirus-like particles were present in the sap of infected plants and cylindrical inclusions visible as pinwheels, bundles and scrolls were found in thin sections of infected cells. The Australian isolates of PRSV-P reacted strongly in ELlSA with antibodies to PRSV-Pand PRSV-W, but only weakly with antibodies to watermelon mosaic virus -2 or zucchini yellow mosaic virus. PRSV-P was mechanically transmitted to papaya and a number of species in the Cucurbitaceae (cucumber, pumpkin, squash, watermelon, zucchini) and was transmitted by the aphid Myzus persicae. The disease is now considered to be endemic in certain parts of south-east Queensland. A quarantine zone has been established to restrict the entry of papaya or cucurbit vegetative planting material into areas free of the disease. These measures are expected only to delay the spread of the virus.
Australasian Plant Pathology – Springer Journals
Published: Jan 28, 2011
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