Stem Gall
Agrobacterium tumefaciens
1 host plant · Bacterial
Last updated
This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.
Forsythia viridissima occasionally develops galls or abnormal growths on stems, but specific information about causal agents and management is limited. The condition appears uncommon and of minor concern for ornamental growers.
Galls are abnormal growths triggered by the pathogen and cannot be reversed once formed. Prune out galled tissue when practical, cutting well below the affected area. Avoid wounding plants during maintenance, as many gall-forming organisms enter through fresh injuries. For severe or recurring gall problems, consider whether the species is well-suited to the site conditions, as stressed plants tend to be more susceptible.
Quick Reference
Management
Cultural Controls
- Use pathogen-free (certified disease-free) nursery stock; inspect for galls before purchase
- Avoid wounding plants; use clean, sharp tools and minimize transplant shock
- Do not plant susceptible species in soil known to contain Agrobacterium, or fumigate/sterilize soil before planting
- Remove and destroy infected plants; do not compost; dispose as municipal waste
- For small galls on valuable plants, surgical removal of the gall with a 2-3 inch margin of healthy tissue may be attempted, followed by wound dressing