Summary
Severe mosaics caused by potato virus X alone are commonly found in potato crops where new seed replacement is infrequent, and the varieties grown are wholly infected with the virus. These severe mosaics often arise in single stems of otherwise symptomless plants and spread rapidly through leaves of each stem until all foliage is showing severe symptoms. The rapid movement of a strain, newly arisen either by mutation or host selection, through parts of a plant already infected with that virus nullifies the principle of cross-protection.
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Additional information
Contribution No. 64, Research Station, Canada Department of Agriculture, Fredericton, New Brunswick, Canada.
Potato Breeding Section.
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Munro, J. The importance of potato virus X. American Potato Journal 38, 440–447 (1961). https://doi.org/10.1007/BF02861108
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DOI: https://doi.org/10.1007/BF02861108