Bacterial leaf spot on plants may manifest in several different ways. Symptoms of bacterial leaf spot may include black edged lesions, brown spots with yellow halos, or just light and dark areas on the foliage.
Bacteria can be transferred to new plants by wind, water, contaminated soil and insects.
To prevent bacterial infection, be sure to use new & high quality soil when repotting. And before reusing any pots, they should be scrubbed clean and rinsed in a solution of one part bleach to nine parts water to kill any disease present.
Contaminated tissue cannot be treated, so prevention is most important and more effective than treatment
Here's what to do if your plant has Bacterial & Fungal leaf spot:
1. Isolate the infected plant.
2. Remove and destroy any infected plant material.
3. The plant can be treated to prevent further damage, using a copper fungicide.
Hot tip: Avoid splashing water on the foliage since this spreads the fungi