Incidence of Ilarviruses in Young Peach Trees in California

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Abstract
Indirect enzyme-linked immunosorbent assays (ELISA) of young cling peach (Prunus persica) trees in the Sacramento and San Joaquin valleys of California revealed that about 28% in first- to fifth-leaf trees were infected by either prune dwarf virus or Prunus necrotic ringspot virus, or by both. Peach trees infected by both viruses were severely stunted. Infection was confirmed in about one-half of the ELISA test trees by bud-chip inoculations onto Shirofugen flowring cherry trees (P. serrulata). These results strongly suggest that infected scion buds, rootstocks, or both were used in the propagation of nursery trees.