Apple scar skin viroid

Apscaviroid • Viroids • other plant pathogens • plant diseases • pests-diseases-weeds

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symptoms of Apple scar skin viroid infection on apple fruit (click on image to enlarge it)
Author(s): H.J. Larsen
Source: IPM Images

Apple scar skin viroid (ASSVd)

This viroid is widely distributed and infects certain cultivars of apple as well as other Rosaceae, for example pear. It causes breaking and distortion of fruits with brownish scar-like lesions (dapple apple disease). The disease has caused serious economic losses during outbreaks in the 1930s and 1950s in eastern Asia.

The viroid is the type species of the genus Apscaviroid. The RNA-size of the different variants of the viroid is between 329 and 334 nt.

For a review see Di Serio et al., 2018.