PNRSVPrunus Necrotic Ringspot Virus
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PNRSV is hard to detect visually because the leaves usually look normal, unlike some other viral diseases.
Samples from some 20,000 Prunus trees that nurseries use as sources of budwood and seed are tested each year for PNRSV and another virus called prune dwarf virus (PDV).
It showed that, depending on peach tree age, the incidence of PNRSV ranged from about 11 to 49 percent.