What is "capillovirus"

Capillovirus is a genus of viruses in the order Tymovirales, in the family Betaflexiviridae. Plants, pome fruits, citrus, and pear serve as natural hosts. There are currently only two species in this genus including the type species Apple stem grooving virus. Diseases associated with this genus include: abnormal graft union, possibly black necrotic leaf spot disease.