Předběžné výsledky hodnocení vybraných odrůd slivoně a meruňky na přirozenou rezistenci k viru šarky švestky [Preliminary results of evaluation of selected plum and apricot cultivars for natural resistance to plum pox virus infection]

Plum pox virus (PPV) is of the most important and harmful virus disease of plums, apricots, and peaches. Previous research has shown the non-transmissibility of PPV by aphids to genetically modified ’HoneySweet’ plum cultivar and to PK clone of BN4Kr myrobalan rootstock. In our experiments, the hypothesis was verified that non-transmissibility of PPV by aphids also exists in more resistant non-transgenic cultivars of plum or apricot. Therefore, relatively resistant cultivars of plum ’Gabrovská’, ’Anna Späth’, ’Althanova renklóda’ and apricot ’Harcot’, ’Hargrand’, ’Krajová raná’, grafted on the aphid transmission resistant myrobalan rootstock PK, were tested in pilot plantation conditions. None of the tested plum and apricot cultivars were naturally infected with PPV by aphid transmission. However, during monitoring in particular years, the successive die back of the ’Krajová’ and ’Hargrand’ apricot trees was noted, probably due to the poor affinity with PK myrobalan. Monitoring will continue in the following years.