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Signs of damage
- Black spots with yellowish margins. Spots are one of the most visible symptoms of the disease; sometimes, they can be just darker areas on the leaves. At first, they are rather tiny, but they become more visible each day. These spots develop on older leaves, not the new ones.
- Dark or yellow margins of the leaves. With time these edges become drier and eventually break off.
- The leaves' texture changes. Bacterial leaf spots weaken the plant; hence the foliage becomes more fragile and peppery.
How to prevent
Cold and wet conditions are ideal for this illness, so it's better to fix such issues if you have a possibility. For example, avoid overhead watering, don't trim plants if it's too wet around, etc. Be careful at the beginning since this pathogen is seed-borne. That's why you have to buy only disease-free seeds or treat them with hot water; it will help a lot. The place where you plant the seeds is also crucial because it's better to rotate the plants every few years.
If you have noticed that your crops got this disease in the early stages, it's better to apply copper-based fungicide, but its effectiveness is limited. The most unpleasant part of this illness is the fact that there is no perfect solution to it. Once your plant is affected, you have to remove affected parts of it and, obviously, destroy it because it is important not to let it spread further. As you can guess, the best way to deal with this disease is to prevent it.
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