Little cherry virus 1

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sweet cherry with symptoms of infection by Little cherry virus (click on image to enlarge it)
Author(s): H.J. Larsen
Source: IPM Images

Little cherry virus 1 (LChV-1)

The virus is endemic to eastern Asia but is now widely distributed in temperate regions. It infects cherry and can also spread to some other Prunus species.

Symptoms include small fruits (on cherry), stunting and decline diseases as well as reddish leaves with curled up edges (on cherry) or yellowing and mottling of the foliage (e.g. peach). On cherry, the foliage symptoms not necessarily appear at the same time as the fruit symptoms. Fruits have a sour taste and are unmarketable. The virus is transmitted by mealybugs as well as by contaminated pruning tools. See also Little cherry virus 2, causing similar symptoms.

For details see the respective page in Wikipedia.