Problem-specific reference photo
under review
Problem-specific reference photo under reviewunder review
Bacterial · Plant health field guide
Bacterial leaf spot syndrome
Several bacteria cause wet-looking or angular lesions that can spread through splashing water.
Act soonPossible cause—not a diagnosis. Compare the visible signs, plant identity, and growing conditions before treating.
Signs you may notice
- water-soaked spots
- angular spots
- yellow halos
- rapid spread
Safe first checks
- Avoid wetting or handling affected foliage, isolate the plant, and compare lesion pattern and progression.
- Separate the plant if the problem may spread.
- Remove only badly affected material with clean tools.
- Improve airflow and keep affected foliage dry while you compare the signs.
Can look similar to
Overlapping symptoms are common. Compare these alternatives before choosing a treatment.
- fungal leaf spot
- edema
- sunburn
What to avoid
Do not assume every spot is infectious or use a disease-specific product without confirming the host and pattern.
Record and follow up
Photograph the same area in consistent light and note whether lesions enlarge, appear on new leaves, or stop after conditions improve.
Seek qualified local help when damage is severe, rapidly spreading, or may involve a regulated pest or disease.