Camellia leaf spot disease, what to do if camellia leaves have dark spots?

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Leaf spot. Black spots appear on the leaves of tea trees, which may be caused by leaf spot disease. This is a common disease of the tea plant.

In the early stages of the disease, dark brown spots appear on the leaves, and over time, these spots gradually enlarge, resulting in large grayish-brown patches on the leaves, some of which may be grayish-white. Many small black spots will appear on the brown patches, which will eventually cause the leaves to wilt and fall off. Camellias get leaf spot disease because the air is too hot and humid, not ventilated, or watered too much.

The spores of the pathogenic fungus infect the plant through various routes and spread wildly, causing camellia to suffer from disease spots. Method: If you have this disease, you must remember not to let the water get on its leaves, otherwise it will accelerate the disease.

Before overwintering, all the infected leaves are removed and incinerate, and then sprayed with stone sulfur mixture. Take care to protect the leaves from sunburn and frost. In addition, regular spraying of the liquid medicine can play a role in prevention and nutrition, which can reduce the chance of camellia getting sick.

Bituminous coal disease. If the camellia suffers from bituminous coal disease, black spots will also appear on the foliage. These spots are grayish-brown at first, and gradually darken and enlarge later.

The disease is usually a fungal infection induced by aphids and scale insects in hot, humid and poorly ventilated environments. The higher the degree of heat and humidity in the environment, the faster the lesion spreads. The black spots after infection will destroy photosynthesis and affect the healthy growth of plant bonds, which is very harmful to plants.

**: First of all, prevent it from the source, pay attention to the air circulation and sufficient light in the plant growth environment. After illness, the diseased leaves can be wiped with water to remove mildew on the leaf surface.

However, the cause of the disease is pests, so it is necessary to treat the disease from the source and kill all the aphids and scale insects that cause the disease. It is necessary to apply medicine frequently to prevent and maintain the healthy growth of camellias.

What drugs can be used to **Camellia leaf black spot disease?

1.Symptoms and causes of camellia leaf black spot disease.

Camellia leaf black spot disease, also known as camellia leaf spotted disease, is a type of tumor charcoal disease caused by a fungus. Symptoms include the appearance of a non-sizing appearance on the leaves of the camellia.

1. Black spots with blackened edges, brown or grayish-black, and irregular spots. If it is not prevented in time, it will lead to camellia wilting, leaf falling, affecting the opening of flowers, and in severe cases, it will lead to the death of camellia. Camellia leaf black spot disease is mainly caused by the comprehensive influence of water, soil, pathogenic bacteria, climate, pathology and other factors.

2.Methods to prevent black spot disease in camellia leaves.

In order to avoid the occurrence and spread of camellia leaf black spot disease, people need to take the following measures:

Select camellia varieties with strong disease resistance, and require seedlings and soil to be free of pathogens;

Strengthen fertilization and drainage to ensure good soil drainage;

Routinely clean up fallen leaves and other plant waste dropped by camellia to ensure the timely disposal of domestic garbage in the garden.

3.**Medications for camellia leaf black spot disease.

If there is black spot disease on camellia leaves, it needs to be carried out in time**. **Camellia leaf black spot disease, the right drug can achieve better results. The main drugs currently used are:

Phenol. Phenol is a broad-spectrum fungicide that has good control effect on a variety of fungi and bacteria. Phenol can inhibit the development of black spot disease in camellia leaves and reduce the harm of the disease to camellia. Add phenol to an appropriate amount of water, evenly spray on the camellia leaves that have appeared black spots, spray once every 7 days, and spray 2 times in a row.

Calcium hydroxide. Calcium hydroxide is an alkaline substance that has the effects of sterilization and disinfection. Camellia with Camellia leaf black spot disease can be treated with calcium hydroxide**. Add calcium hydroxide powder to an appropriate amount of water, spray evenly on the leaf surface, spray once every 10 days, and spray 3 times in a row.

4.Summary.

Camellia leaf black spot is a common disease among flower diseases, **Camellia leaf black spot disease needs to take a scientific approach. The best way to prevent and improve camellia leaf black spot disease is to adopt comprehensive control methods, including strengthening cultivation management, timely cleaning of waste, and selection of appropriate pesticides. In the selection of drugs, chemical agents such as phenol and calcium hydroxide can be used, which have good prevention and control effects.

However, when using chemicals, the concentration of the chemicals should be controlled within an appropriate range to avoid secondary harm to flowers.

The reasons for camellia leaves are: too much light, poor ventilation, too strong fertilizer, pests and diseases.

1. The light is too strong.

Camellia needs to be maintained in a ventilated and auspicious semi-shaded environment, avoiding strong light exposure to direct sunlight, if the light is too strong, it will cause the camellia to wither.

2. Poor ventilation.

Poor ventilation can cause camellia plants to grow slowly, and even the leaves will turn yellow and fall off. It is necessary to regularly circulate the air in the room, and prune the branches and leaves of the camellia that grow too densely to increase the light transmittance and ventilation of the plant.

3. The fertilizer is too thick.

The roots of camellia have a very limited tolerance to thick fertilizer, and if the fertilizer concentration is too large, it will burn the roots, causing the leaves of camellia to turn yellow and fall off. It is necessary to stop fertilizing immediately, change the soil, or wash the soil with plenty of water to reduce the amount of fertilizer in the soil.

4. Pests and diseases.

Camellia is susceptible to bacterial infection or insect infestation during the growth stage, resulting in long spots, yellowing and falling off leaves. Diseased and yellow leaves need to be cut off with sterilized scissors and sprayed with chlorothalonil every other week, and recovery can be achieved after a period of time.

How to prevent camellia from shedding leaves

1. It is necessary to repot the plant in time, give the broken part to the pruning point, and then match it with a fresh and nutritious substrate to let it develop.

2. It needs to be exposed to appropriate light, only then can the plant maintain good growth.

3. It needs to be provided with a suitable temperature, not too low and not too high.

4. Reduce the application of water and fertilizer for a period of time to allow the plant to heal itself.