Apple chlorotic leafspot virus (ACLSV) is a plant pathogenic virus of the family Betaflexiviridae. Damages This virus reduces tree vigor (50% on pear), reduces yield (40% on pear), and causes quality reduction on fruits (if symptomatic). Pathogen This virus is a trichovirus with filamentous particles. It has no natural vectors and it is easily transmitted mechanically to herbaceous hosts. Transmission The virus is only transmitted by grafting using infected clonal rootstocks, top-working existing trees with infected scion cultivars, and using infected trees as a source of propagation materials. External links ICTVdB – The Universal Virus Database: Apple chlorotic leafspot virus Family Groups – The Baltimore Method Trichoviruses Viral plant pathogens and diseases