Small black brown spots appear on the camellia leaves, and the leaves fall off, what s going on?

Based on your description, I think your camellia must have had an outbreak of anthrax. Anthrax is still very high in flower diseases, and the harm is relatively serious. Generally, the damage rate of leaves is 10% to 30%, and in serious cases, it can be as high as 90% or more.

When anthracnose occurs in camellias, all parts of the plant except the roots may be infected. After the conidia disc of the pathogens, it produces scattered small black spots, causing the leaves to fall off and even cause wilting.

Anthracnose is spread by conidia on the diseased camellia plant, or enters the soil with the diseased leaves for wintering, and when the conditions are suitable in the spring of the following year, the pathogen produces a large number of conidia in the diseased part, which is spread by wind, rain or watering splashing, and invades from the wound or directly. The optimal temperature for conidia germination is 20 to 25, the relative humidity of the air is more than 80%, and the incidence is highest when pH 4 8.

When the growth environment of camellia is humid and not ventilated, or when the plant is thin and the disease resistance is reduced, it is conducive to the invasion of pathogens. Moreover, the disease also has the characteristics of latent infiltration, sometimes it does not occur after invasion, and it only appears when the environmental conditions are suitable and the plant is weak.

Prevention measures for camellia anthracnose, reasonable fertilization, removal of diseased branches, diseased leaves, and dead shoots, incineration. Put potted camellia in a place with light and ventilation, not too dense. Or spray 50% carbendazim wettable powder 500 times aqueous solution, or 25% carttrane wettable powder 500 times liquid or 80% anthrax formamine wettable powder 800 aqueous solution.

Spray the medicine every 10 days, and 3 to 4 times in a row is fine.

The first symptoms follow, but the bacterial infection is also more severe. , the spots are particularly dense. When this happens, if there are few spots, you can fumigate them with cigarette butts, and then spray the plants with a solution of 800 to 1000 times of methyl tobuzin or mancozeb, the front and back of the leaves.

You can also use one of the two drugs to apply a powder, or other sterilization powder and ointment to the diseased area of the leaf, and use a combination of spraying, generally 2 to 3 times can control the disease.

If the plant disease is more serious, the leaves and branches infected with the disease can be cut off, and combined with the wet spraying method for all-round sterilization and disinfection, including other flowers, trees and objects around the plant, and the ground should be sprayed with drugs to completely kill the germs. At the same time, it is necessary to ensure that the plant growth environment has good ventilation, suitable scattered light and sufficient air humidity, so that the plant will grow robustly and improve its own immunity. During the growth period of the plant, the thin phosphorus and potassium nutrient solution can be applied two to three times a month to effectively enhance the disease resistance of the camellia plant.

Leaf spot disease will cause black spots on the leaves, and over time, the black spots will slowly spread, making the leaves appear large patches, and bituminous coal disease, the leaves will also appear black spots, in the early stage of bituminous coal disease, the leaves will be gray-brown in the later stage, and its leaves will turn black, which will cause the leaves to dry up and fall off.

Because the leaves are inhabited by a lot of insects or eggs. These insects absorb one of the upper vegetative leaves, and small spots appear in the color, which eventually fall off.

In this case, it should be that the flower arrangement has encountered an insect infestation. We need to remove these problematic leaves and spray them with the drug.

Camellia leaves have spots on the curls, the original cause is here, easy to solve.

The edges of the leaves of the camellia turn brown and fall off, probably infected with anthracnose, you can cut off the diseased branches and leaves, gather them and burn them, and spray 65% zeb zinc wettable powder 800 times liquid and other fungicidal drugs on the camellia.

It may also be that the roots are rotten due to improper water and fertilizer, so you can take out the camellia plants, prune off the rotten roots, disinfect and sterilize them and replant them. It may also be that it has been exposed to the sun, avoid strong light, and move the camellia to a cool and ventilated place to promote leaf recovery.

1. Infection with anthrax.

Reason: Camellia is a very beautiful flower, if you are accidentally infected with Colloidal Anthracnose, it will cause anthracnose, and the edges of the leaves will turn brown and fall off. In the early stage of infection, the diseased part of the leaf will appear green water-stained lesions, and then gradually turn brown, the lesions will expand, and there will be many small black spots, so that the whole leaf will be infected with the disease, and eventually lead to water loss and fall off, affecting the growth of the entire camellia plant.

Solution: For the already infected camellia, you can cut off the diseased branches and leaves, gather them and burn them. Spray 800 times of 65% zebsen wettable powder, 800 times of 50% wettable tobuzin, 800 times of 50% carbendazim wettable powder, etc., spray once a week or so, and continuously cross-spray.

2. Root rot.

Reason: If the camellia is not watered and fertilized properly during growth and maintenance, it may cause root rot, so that the edges of the leaves will turn brown and fall off.

Solution: After the rotten roots are found, they should be treated in time, take out the camellia, cut off the rotten roots in time, disinfect and sterilize and replant.

History. The history of camellia cultivation in China can be traced back to the Shu Han dynasty (221-263 AD). At that time, people attached great importance to the status of camellia, and camellia was listed as "seven products and three lives".

According to the data, there are more than 20,000 registered camellia varieties in the world. There are 883 varieties of camellia in China.

In the Three Kingdoms period, camellia was already cultivated artificially. However, until the Northern and Southern Dynasties and the Sui Dynasty, the imperial court and the aristocratic courtyards were still wild and primitive camellias, with single-petaled red flowers. At that time, the literature about camellia and the poems of "camellia" and "sea pomegranate" chanted by literati did not involve the name of the variety.

The above content reference: Encyclopedia - Anthrax.

Summary. Dear, I'm honored to have your question The information that the teacher found for you here is: there are brown spots on the back of the camellia leaves; Brown spots on the back of camellia leaves are brown spots.

Leaf spot. Sometimes multiple lesions form larger plaques or spread throughout the leaves, causing scorching and sloughing of the leaves. Camellia red leaf spot is a fungal disease.

Can be used 70% methyl tobuzin 1 000 1 500 times liquid, the leaves of camellia appear spots, generally there will be black spots and mildew two situations, mostly the breeding environment is not ventilated, high temperature and humidity, long-term light caused, need to cut off the leaves of the long spots in time, and then wipe on the leaves.

Dear, I'm honored to have your question The information that the teacher found for you here is: there are brown spots on the back of the camellia leaves; The brown spots on the back of the camellia leaves are brown spots. Leaf spot.

Sometimes multiple lesions form larger plaques or spread throughout the leaves, causing scorching and peeling of the leaves to re-ignite. Camellia red leaf spot is a fungal disease. 70% methyl tobuzin 1 000 1 500 times solution, camellia leaves spots, generally there will be black spots and mildew spots, mostly the breeding environment is not ventilated, high temperature and humidity, long-term light leakage caused, need to be cut off in time to long spots of the leaves, and then wipe on the leaves.

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1. The black spots on the leaves of camellia may be infected with leaf spot disease, leaf spot disease is also a problem that many farmers have encountered, this is a disease that specifically harms the leaves of plants, the initial symptoms of the disease are black-brown spots on the leaves, and then slowly increase, expand to the surroundings, and finally more and more, and then grow the entire leaf, causing the leaf to die and fall off, and then infect other leaves.

2. Some lesions also have gray-brown and gray-white lesions. Most of the reasons why camellia will be infected with leaf spot disease are due to the air is too humid and hot, not ventilated, so that the bacteria have the conditions to breed, too much watering is also one of the reasons, once the water will cause the root system to rot, and the bacteria will take advantage of the weakness at this time to infect the plant. These pathogens can spread through many pathways, causing more leaves and plants to be infected with leaf spot.

Black spots on the leaves of camellia may be leaf spot, which is a common camellia disease, in the initial stage of the disease, there will be black-brown spots on the leaves, and over time, these spots will slowly expand, so that the leaves appear large gray-brown patches, and some will be gray-white. There are many small black spots on the black-brown patches, which eventually cause the leaves to wilt and wither.

The reason why camellia can get leaf spot disease is mostly because the air is too humid and hot, not ventilated, or caused by too much watering, and the spores of the fungus infect the plants through various ways and spread wildly, so that the camellia suffers from disease spots.

Method: If you have this disease, you must remember not to get water on its leaves, otherwise it will accelerate the aggravation of the disease. Before overwintering, all infected leaves are removed and burned, and then sprayed with stone sulfur mixture**.

Take care to protect the leaves from sunburn and frost. In addition, you can regularly spray the liquid medicine for prevention and nutrient supplementation, which can reduce the chance of camellia disease.

If the camellia has bituminous coal disease, it will also appear black spots on the surface of the leaves. These lesions are grayish-brown at first, but gradually turn black and widen in size.

The disease is generally a fungal infection induced by aphids and scale insects in a hot, humid and poorly ventilated environment. The higher the degree of humidity and heat in the environment, the faster and faster the lesions spread, and the black lesions that appear after infection will destroy photosynthesis, affect the healthy growth of plants, and cause great harm to plants.

**Method: First of all, it is necessary to prevent it from the source, pay attention to the air circulation and sufficient light in the plant growth environment, and wipe the diseased leaves with water to remove mildew from the surface of the leaves. However, the cause of the disease is pests, so it is necessary to start from the source, and all the aphids and scale insects that induce disease should be killed, and they should be sprayed frequently to prevent insecticide in ordinary times to maintain the healthy growth of camellia.

This situation occurs in camellia leaves, and there are many reasons for it. If it is caused by stagnant water and rotten roots, it is necessary to find a way to drain the water, suspend water irrigation, and cooperate with ventilation. If it is caused by excessive fertilizer dosage, it is necessary to apply fertilizer correctly, and water and dilute it in time when the fertilizer concentration is too high.

If it is caused by infection with pests and diseases, it is necessary to remove the diseased leaves in time to avoid spreading, and spray the agent according to the symptoms.