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The symptoms in potato vary depending on virus strain, potato cultivar and environmental conditions. They range from mild to severe mosaic with necrotic flecking, curling and leaf-tip necrosis. A wide daily fluctuation in temperature, in particular cold conditions, seems to favour symptom expression in infected plants growing at high altitude. Severe symptoms are also induced in mixed infections with other potato viruses (Jones and Fribourg, 1978). Symptoms were not observed in ulluco (Lizárraga et al., 1996)
As with all potato and ulluco viruses, control depends on the production of high-quality seed potatoes and ullucos from virus-free nuclear stock.
Importation of potato tubers from countries where APLV occurs should be prohibited. APLV is one of the group of South American pests of potato which justify strict post-entry quarantine procedures in the EPPO region, together with equivalent checks before export. Only material for scientific purposes, in quantities limited to what is strictly necessary and subject to import permit, should normally be imported from countries where APLV occurs. Because of the probability that any material of wild tuber-forming Solanum species originates ultimately from South America, the same tests should be applied whatever the origin. EPPO's specific quarantine requirements (OEPP/EPPO, 1990) outline suitable quarantine measures, while EPPO's phytosanitary procedures lay down the test procedures to be followed both before export and in post-entry quarantine after import (OEPP/EPPO, 1984b).
APLV is restricted to the Andean region of South America. Despite its name, APLV can cause serious symptoms in secondarily infected potato plants (Jones and Fribourg, 1978). However, yield reductions in potato and ulluco have not been studied, and it is not clear how important APLV is in practice.