Lilac Ring Mottle

Lilac ring mottle virus

12 host plants

Last updated

Data Maturity Baseline

This profile contains verified disease data from extension databases. Regional field notes and expert review are in progress.

Lilac leaves show ring spots, mottle, and deformation, with variable symptoms by season. This viral disease is mechanically transmissible on tools and in the nursery. Remove infected plants, sanitize pruning tools between plants, and practice sanitation when taking cuttings. Symptom expression can be erratic.

Infected plants should be removed and destroyed. Sanitize pruning and other tools between plants or blocks of plants.

Quick Reference

Causal Agent
Lilac ring mottle virus
Host Plants
12
Spread
Primary transmission: mechanical through contaminated pruning and cutting too...
Favorable Conditions
Symptom expression is highly dependent on environmental conditions and may be...

Management

Vulnerability Window

Infection occurs during propagation (cuttings, grafting) or through pruning/tool contact with infected plant material. Mechanical transmission via contaminated tools is the primary infection route during cultivation and maintenance work. Tool sanitation practices reduce transmission during the growing season. Once infected, lilac plants remain infected for life and serve as continuing virus source. Propagation from infected plants produces infected offspring. Source: OSU plant pathology

What Triggers Infection

Symptom expression is highly dependent on environmental conditions and may be erratic. Leaf deformation, reduction in leaf size, ring spots, and line patterns vary with cultivar and growing conditions. Some infected plants may show minimal or no symptoms for extended periods, making infection difficult to detect visually. Environmental stress may influence symptom visibility. Variegated cultivars such as Syringa vulgaris 'Aucubaefolia' can resemble infected plants. Source: OSU Extension

Cultural Controls

  • Infected plants should be removed and destroyed.
  • Sanitize pruning and other tools between plants or blocks of plants.
  • Use two tools so a worker can trim or cut with one while the other soaks.
  • When done with a batch, cultivar, etc. switch one tool for the other and allow the used one to soak.
  • Sanitation should also be practiced when taking cuttings for propagation.
  • Reference Sharma-Poudyal, D., Osterbauer, N.K., Putnam, M.L. and Scott, S.W. 2016.

Host Plants (12)