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Most plants primarily infected by PVT remain symptomless, but plants of potato cv. King Edward developed slight vein necrosis and chlorotic spotting, while those of cv. Cara showed top necrosis about 12 days after inoculation. Secondary infections are largely symptomless under glasshouse conditions.
As with all potato viruses, control depends on the production of high-quality seed potatoes from virus-free nuclear stock (OEPP/EPPO, 1999a). Dodds and Horton (1990) stress the value of producing plantlets free from PVT using nucleic acid spot hybridization and nitrocellulose membrane enzyme-linked immunosorbent assays.
PVT is not known to have any direct economic importance in potato, or in the other Andean tuberous crops that it infects.