For confirmation of HSVd presence in field trees, 10 Japanese plums cv. Angeleno, 10 peaches cv. June Gold, and 10 peaches cv. Spring Crest, HSVd-negative (TPH), were bud- or chip-grafted from two of the aforementioned Japanese plums cv. Angeleno and two of the aforementioned peaches cv. Red Haven. Two years later, five Japanese plum trees (cv. Angeleno) and five peach trees (three cv. Spring Crest and two cv. June Gold) were found HSVd-positive with TPH; no fruits were observed to produce fruit symptoms as the grafted trees were kept in an insect-proof greenhouse (no bees for cross-pollination). To our knowledge, our investigation reports for the first time the occurrence of HSVd infecting Japanese plum, cherry plum, and peach in Greece, emphasizing the need for a certification program for the prevention of spreading stone fruit tree viroids in this country.