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What causes black leaves on camellias?

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This phenomenon is not common. If it does occur, the problem may be fairly serious. Specifically, there may be four causes. One is "anthracnose". The second is pest damage. Third, it may also be related to watering, with two scenarios: one is that too much water causes root rot, and the leaves turn black; the other is that the quality of the water used is problematic. So this aspect will be discussed case by case. The last cause is fertilizer damage, from applying too much or at too high a concentration.

1. Disease problems

(1) Specific cause: This is one of the most likely reasons for the blackening. This plant is prone to infection by a disease called "anthracnose". After infection, as the condition gradually worsens, the leaves become increasingly like something scorched. And leaf drop also worsens day by day.

(2) Solution: If the problem is disease, then first we must collect these blackened leaves and burn them all together. In this way, by removing the source of infection, the situation may ease somewhat. Then, spray some chemicals, and the plant may gradually recover.

2. Pest damage

(1) Specific cause: This is also a very common cause. Any plant suffering from pest damage can show black leaves, and this plant is the same. As the damage worsens step by step, the blackened areas grow larger. In this way, water transport is inhibited, and the leaves eventually dry out and fall off.

(2) Solution: For this situation, the treatment method is much the same as the first. First deal with the diseased leaves, then spray chemicals.

3. Water problems

(1) Specific cause: As mentioned above, there are two scenarios. One is too much water, which causes the roots to lack oxygen and later causes the leaves to turn black. The second scenario is the quality of the water, which may also cause the leaves to turn black.

(2) Solution: The measure for the first scenario is naturally to reduce the amount of water, then add ventilation. For the second, you can add some (FeSO4) solution to the water.

4. Fertilizer problems

(1) Specific cause: This also divides into two scenarios, one is too much quantity, and the other is too high a concentration.

(2) Solution: For the two different situations above, the amount of fertilizer used at one time should not be too much, and the concentration should also be low. Simply put, it can be summed up as "light fertilizer, frequent application".

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