What if the lilac leaves turn black?

1. Germs

Its blackening is mainly caused by a pathogen, a pseudomonas, which is rod-shaped, has one or two flagella on one side, and can swim in water without a capsule. And its metabolic type is respiratory type, the requirement of nutrition is not very high, as long as there are simple organic compounds and some inorganic salts, it can grow very fast.

Second, the law of propagation

Generally speaking, this kind of thing spends the winter on diseased branches and leaves, and it can split and reproduce when the temperature and humidity are suitable for it the following year. In addition, its spread and invasion all depend on water, so it can develop rapidly in a relatively humid environment.

Therefore, in lower places or places with more Rain Water, cloves are easy to get sick, and the leaves are easy to turn black. But in general, purple ones are more difficult to get sick than white ones.

III. Improvement methods

In general, there are two ways to improve, one is horticulture, and the other is medicine.

1. Solving the problem from the perspective of horticulture can also be regarded as a fundamental solution to the problem, that is, if it is not planted in a relatively low place, there will be no stagnant water. in addition, if it rains, it still needs to be drained out in time, and we should test it carefully when introducing seedlings, and we can't bring in diseased plants.

2, pass the medicine to treat, generally what we use is Bordeaux liquid. The initial spray is 0.1% to 1.0%, of course, there are other reagents such as carbendazim and so on. In addition, we can sprinkle it with some bleach or sulfur powder under the bushes.