Abstract
Potato has significant importance for human feeding, and shows great yield potential. However, viruses transmitted by vectors have caused severe yield losses in this crop. It results in the dependency of import batches of virus free potato-seeds. The aim of this study was to analyse the influence of the fungicide Metiram+ Pyraclostrobin on the translocation of PVY virus into the plant with primary infection, and on yield. Also, the purpose was to evaluate the transmission capacity of this virus using different amounts of aphids. The experiments were carried out in a greenhouse located at the Campinas Agronomic Institute (InstitutoAgronomico de Campinas-IAC) in 2007.Healthy potato plants of cultivars Agata and Markies were used in order to study the fungicide effect, and potato plants of cultivar Bintje was used as the PVY source. For virus dissemination analysis, it was used healthy potato plants of cultivar Agata, and infected potato plants of cultivar Monalisa. According to the results, fungicide Metiram + Pyraclostrobin did not control the PVY virus translocation, and did not have positive effect on yield, although it delayed the plants senescence. It was also observed transmission of viruses with the lowest number of aphids used, highlighting the ease of dissemination of PVY by aphids. Due to the e asy transmission of PVY virus by aphids, and damage caused on potato, more studies are needed to understand the dissemination of viral diseases and improve the management techniques used by farmers against this problem in this crop.
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