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Signs of damage
- Cankers.
- Flower blights.
- On lilacs: Lilac leaves develop brown spots, round to irregular-shaped with yellow borders. Twigs will also die and turn black.
- On maples: Some maple species will experience leaf spotting, blackened veins, and death of branch tips.
- Frost damage. Due to the ability to promote the appearance of ice crystals.
- Dieback.
How to prevent
Pruning should take place in winter and early spring to ensure the plant doesn’t have open wounds or injuries during the growing season. Proper sanitization of tools when handling plants will reduce the risk of infections.
Avoid choosing susceptible plants for frost-prone areas, and choose species that are resistant to these bacteria when possible.
Fertilization also shouldn’t be employed if it will create succulent growth in early spring.
Heal
There is no guarantee that healing can occur since only a few bactericides are known to reduce populations. These are mostly cooper sprays, but they are known to damage young plant tissue, and some species of Pseudomonas have grown resistant to them.
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