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Susceptibility of plum cultivars: 'Katinka', 'Jubileum', 'Diana', 'Valjevka', 'Żółta Afaska', 'Elena', 'Jojo', 'President', 'Vision', and 'Węgierka Zwykła' (Pozegaca type, included as reference, highly susceptible cultivar) to aphid-vectored Plum pox virus (strain D), was evaluated. The trees were grown for 7-8 years in the field characterized with high infection pressure. 'Katinka' and 'President' showed susceptibility even higher than 'Węgierka Zwykła'. 'Vision' and 'Valjevka' showed relatively low susceptibility with less than 30% of trees becoming infected. All 'Jojo' trees remained free from ELISA-detectable amounts of PPV, although a high percentage of the fruit of this cultivar showed sharka-like symptoms on stones and fruit flesh. The reason for that phenomenon is not known.

journal of horticultural research

Evaluation of the Susceptibility of Several Plum (Prunus Domestica L.) Cultivars to Plum Pox Virus (Ppv) Infection in the Field. Sharka-Like Symptoms Observed on 'Jojo' Fruit are Not Related to PPV