To assess the durability of resistance to PPV of 'HoneySweet' transgenic plum harbouring plum pox virus (PPV) capsid gene, a new field trial was recently established in Romania at Fruit Research & Development Station Bistrita. 'Stanley' and 'Reine Claude d' Althan' cvs. were used as control. PPV inoculum source was secured within the experimental plot. PPV monitoring was made by visual observations of symptoms development on leaves and by serological (DAS-ELISA) and molecular (IC/-RT-PCR) testings. Three years after tree planting PPV was observed and detected only on 'Stanley'. 'HoneySweet' and 'Reine Claude d' Althan' cultivars remained PPV free.

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