What to do if clove leaves turn black

1. Pathogens

The blackening is mainly caused by a pathogen, which is a Pseudomonas. It is rod-shaped, has one or two flagella growing on one side, can swim in water, and has no capsule. Moreover, its metabolic type is respiratory, and its requirements for nutrition are not very high. As long as there are simple organic compounds and some inorganic salts, it can grow very fast.

2. Laws of Communication

Generally, this kind of thing spends the winter on diseased branches and leaves. When the temperature and humidity are suitable for it in the second year, it can reproduce by fission. In addition, its spread and invasion both rely on water, so it can develop very quickly in a relatively humid environment.

Therefore, in low-lying areas or places with heavy rain, lilacs are prone to disease and their leaves can easily turn black. But in general, purple ones are less likely to get sick than white ones.

3. Improvement Methods

There are generally two ways to improve the situation. One is gardening, and the second is treatment through medication.

1. Solving the problem from a gardening perspective is also a fundamental solution to the problem, which is not to plant it in a low place so that water will not accumulate. In addition, if it rains, the rain still needs to be drained out in time. When introducing the seedlings, we must inspect them carefully and not bring in diseased plants.

2. Treat it with medication, usually Bordeaux mixture is used. Initially, 0.1% to 1.0% was sprayed. Of course, there are some other reagents such as disodium pyrochloridone. In addition, we can also sprinkle some bleaching powder or sulfur powder under the bushes.