Pear blister canker viroid
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Pear blister canker viroid (PBCVd)
This viroid is widely distributed. It causes bark disorders on certain pear cultivars, but is latent in most commercial pears. The viroid consists of 315 nucleotides. Initially, the bark develops cracks and pustules, followed later by cankers and scaly bark. Leaves and fruits show no symptoms and seedlings rarely become infected. Artificial infections with purified RNA causes the development of symptoms after 2 years.
For a review see Di Serio et al., 2018.