Break Viruses
Little Cherry Virus-1 and Little Cherry Virus-2
3 host plants
Last updated
This profile synthesizes data from multiple published sources. Expert field review is in progress.
Break viruses refer to virus-induced decline diseases of cherry causing severe fruit size reduction, altered coloration, poor flavor, and vigor loss. Little cherry disease significantly impacts cherry production, rendering fruit unmarketable. You'll see small, light-colored, poor-tasting fruit on infected trees. Spread by grafting infected wood and mealybug vectors. Purchase virus-tested planting material.
There is no cure for viral diseases. Remove and destroy infected plants to prevent spread to healthy ones nearby. Many viruses spread through insect vectors like aphids and leafhoppers, so managing those populations helps slow transmission. When replacing removed plants, choose virus-resistant varieties if available and purchase certified virus-free stock from reputable nurseries.
Quick Reference
Management
Young trees are most vulnerable to infection at planting. Infection via insect vectors peaks during mealybug activity periods (late spring through early fall). Grafted nursery material presents maximum risk during propagation (year-round in nurseries). Once infected, trees remain hosts for life, with symptoms typically appearing 2-5 years post-infection depending on cultivar. Source: PNW Plant Disease Management Handbook
Symptom development depends on cherry cultivar susceptibility, virus strain, environmental stress, and tree age at infection. Susceptible varieties (Bing, Lambert, Napoleon, Black Republican) show severe symptoms; resistant varieties (Rainier, Sweetheart) may remain asymptomatic carriers. Tree stress (drought, cold injury, soil issues) may accelerate symptom expression. Co-infection with multiple Prunus viruses increases symptom severity. Source: PNW Plant Disease Management Handbook
Cultural Controls
- Remove and destroy affected plants (including all daughter bulbs).
- Purchase and plant virus-tested (found to be free of known viruses) material.