Apple Mosaic
Apple mosaic
12 host plants
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
White banding patterns appear on apple leaves in spring, especially on new growth; severely affected leaves drop early. This virus can reduce yield significantly on susceptible cultivars. Use virus-tested planting material from certified sources.
The use of certified virus-tested (and found to be free of all known viruses) planting material is the preferred strategy for protection from this disease. Thermotherapy (24 to 32 days at 38°C) and/or apical meristem culture have been used to eliminate various viruses.
Quick Reference
Management
New infections occur at propagation stage (when infected scion or rootstock material is used). Once established, trees remain infected throughout their lifetime. Spring is when symptoms are most visible, typically March-May as leaves emerge. Source: PNW Plant Disease Management Handbook
Symptom expression in infected trees varies with cultivar, seasonal temperature fluctuations, and tree age. Symptoms are more pronounced in years with moderate spring temperatures (15-20°C). Cooler springs may delay or reduce symptom severity. The virus remains latent in infected wood and does not require specific conditions to persist. Source: PNW Plant Disease Management Handbook
Cultural Controls
- The use of certified virus-tested (and found to be free of all known viruses) planting material is the preferred strategy for protection from this disease.
- Thermotherapy (24 to 32 days at 38°C) and/or apical meristem culture have been used to eliminate various viruses.
- References Posnette, A.F. and Cropley, R. 1956.
- Apple mosaic viruses.
- Host reaction and strain interference.
- Journal of Horticultural Science 31:119-133.