Abstract
THE presence of many viruses latent in apple varieties and rootstocks has been shown by the use of indicator plants such as Virginia Crab, Spy 227, and Malus platycarpa. Three of these viruses which on M. platycarpa produce symptoms of line pattern (= chlorotic leaf spot), dwarfing and scaly bark have been shown to be widely distributed. No virus-free source was found of many of the apple varieties and rootstocks grown commercially in England.
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CAMPBELL, A. Apple Virus Inactivation by Heat Therapy and Tip Propagation. Nature 195, 520 (1962). https://doi.org/10.1038/195520a0
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DOI: https://doi.org/10.1038/195520a0
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