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Twig blight (Venturia)

Venturia spp.

14 host plants

Last updated

Data Coverage 3 of 6 dimensions
Causal Agent
Host Plants
Symptoms
Management
GDD Threshold
Regional Notes

Venturia spp. cause twig blight on willow, showing browning of young shoots and leaf lesions. Avoid overhead irrigation and improve air circulation through pruning. Rake and destroy fallen leaves before spring infection periods. Plant less-susceptible willow species. Limited data exist on fungicide efficacy for this willow disease.

Remove blighted tissue promptly, cutting well below visible symptoms. Improve air circulation by thinning dense growth. Avoid overhead watering, especially during bloom and new growth periods when tissues are most susceptible. For recurring problems, preventive fungicide applications timed to protect new growth can reduce infection, but cultural controls should be your first approach.

Quick Reference

Causal Agent
Venturia spp.
Host Plants
14

Management

Vulnerability Window

In spring, apply two or three times beginning when new leaves first appear and repeating at 10-14 da | Prune and destroy diseased twigs and branches in fall when practical.

Cultural Controls

  • Avoid overhead watering.
  • Space plantings and prune trees to improve air circulation.
  • Rake and destroy fallen leaves before the spring infection period.
  • Prune and destroy diseased twigs and branches in fall when practical.
  • Plant less-susceptible willows such as bay-leaved, osier, purple, and weeping.

Host Plants (14)