Different strains of the virus occur with variable host susceptibility and symptoms. Yield and overall economic losses have been catastrophic to plum and peach growers in many countries. In October 1999, the D-strain of PPV was discovered on peaches grown in Adams County, Pennsylvania. Host plants PPV infects virtually all cultivated fruit tree species of the genus Prunus .
Severe symptoms occur on apricot, plum, and peach trees.
Almond trees may be infected occasionally but show few symptoms. The strain reported in the United States does not affect cherries. Symptoms Plum pox symptoms can vary greatly, making the disease difficult to recognize. Symptoms may appear on the leaves or fruits of infected trees. In some cases, only part of the infected tree or even only a single branch will show symptoms.