Bacterial Leaf Blight
Bacteria are spread to African Violets by insects and improper handling. Virtually all bacteria attacking Violets are classified as bacilli. Bacteria will often enter through wounds where leaves have been eaten or broken, but bacteria can also enter through leaf pores (stomata). Bacteria thrive in warm, moist conditions. If left untreated, Bacterial Leaf Blight can be fatal to African Violets.
If your African Violet exhibits this symptom, it probably has Bacterial Leaf Blight. To be sure, cut through an affected leaf with a sharp knife. If bacteria are at work, you will see gooey threads as you pull the leaf apart.
First, isolate all infected plants. Then, using a sterilized cutting tool, remove all affected foliage. Disinfect your cutting tool between cuts with a 10 percent bleach solution, i.e., one part bleach to nine parts water.
Always wash hands before handling your Violets. Before repotting, disinfect pots with a 10 percent bleach solution, and pasteurize potting soil.
Do not overwater, and avoid watering from the top. A self-watering device, which waters from the bottom, is highly recommended.
Do not overfertilize.
Avoid extreme temperature changes.
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