DIFFERENT SYMPTOMS OF THE PEACH LATENT MOSAIC

• in field, generally: delay of bud bursting and fruit maturity (4 to 6 days), deformation of fruits and stones, constriction leaves. rarely on the leaves: yellow mosaic (calico), or blotch, or chlorotic mosaic. or on the wood: stem pitting.
• in greenhouse, generally: no symptom, rarely: mosaic or stem pitting. These symptoms can be reproduced (reaction rate 10 to 90%).

All these symptoms are probably caused by the same virus, provisionally named “Peach latent mosaic virus”.

We note a total cross protection between the different isolates.

We note also no cross protection between them and ILAR viruses, NEPO viruses, Sharka virus, and chlorotic leaf spot virus (CLSV).

Till now attempts to transmit this virus to herbaceous species or other Prunus species have been unsuccessful.

Some characteristics of this disease are similar to those described for “Peach mosaic” in the USA (PINE, 1976) and “Peach yellow mosaic” in Japan (KISHI et al., 1973).

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