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Signs of damage
Common, Persian, Chinese, and Japanese lilac leaves develop round to irregularly shaped brown spots with yellow halos. These spots enlarge and blight entire leaves. Succulent twigs are girdled, killed, and turn black.
How to prevent
- Exclusion or eradication of the pathogen (quarantine and use of pathogen-tested seeds and propagated materials)
- Use of clean transplants.
- Monitor crops regularly and use predictive models.
- Reduce the pathogen levels by crop rotation.
- Remove weeds and incorporate crop residues that can host the disease.
The most common strategy for controlling diseases caused by Pseudomonas syringae is, as it has been for more than 5 decades, to spray bactericides. These mainly include a variety of copper compounds or other heavy metals, with or without various combinations of fungicides or other pest-control chemicals.
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