Abstract
Seven rootstocks were evaluated during 4 years of cultivation in the Czech Republic for susceptibility to natural Plum pox virus (PPV) infection. Sources of PPV infection were plum trees infected with PPV-D and PPV-Rec strains. Rootstocks were planted in groups of 10 plants at distances ranging from 0.2 to 14.5 metres from the source of infection. Plants were evaluated yearly by visual inspection and by ELISA and RT-PCR. The number of PPV-infected plants increased yearly. In the fourth year of evaluation, 72% of ‘Myrobalan 29C’, 70% of ‘Nemaguard’, 41% of ‘Marianna GF8-1’ and 17% of ‘St. Julien’ plants were infected. Nine plants, 4.8% of the PPV hypersensitive rootstock ‘Docera 6’ died or partially died in the fourth year of evaluation after previous systemic wilting. Rootstocks ‘GF 677’ and ‘Myrobalan BN4Kr’ remained uninfected. Naturally PPV-infected aphids were not able to transmit the virus to these rootstocks. Rootstocks ‘GF-677’ and ‘Myrobalan BN4Kr’ can therefore be recommended for plum, apricot and peach cultivars in areas of endemic PPV infection or in regions where PPV is a threat.
Published Version
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