10 common disease control measures for citrus

1, Huanglong disease

Citrus Huanglongbing can occur all year round, and symptoms can occur in spring, summer and autumn. The symptoms in autumn and winter are particularly obvious. The disease is the most threatening and damaging disease in citrus growth. The disease is currently incurable and is called "cancer" of citrus. The disease starts from the root disease. One symptom of Huanglongbing is yellowing of the leaves, but the yellowing of the deficiency is not really a deficiency. It is because the roots are rot caused by Huanglong disease, which causes the fruit trees to absorb fertilizers, which leads to the deficiency of leaves.

10 common disease control measures for citrus

2, citrus blight (embryo disease)

It is mainly used to damage the young leaves, top buds and newly drawn young shoots of citrus seedlings, and sometimes infects mature leaves and shoot tips. Citrus seedling disease is also a common disease, which occurs in various orchards and is easily mistaken for citrus anthracnose. The damaged shoots and leaves are boiled and hot, and the lesions are amorphous, light brown to brown. When wet, the surface of the affected area is balanced with white mold (pathogen cysts and sporangia).

10 common disease control measures for citrus

The disease is severely affected in humid and hot weather, and the bacteria spread rapidly. In the spring and autumn, the incidence is serious, and prevention should be strengthened.

10 common disease control measures for citrus

Prophylactic agents can be used with mancozeb, isourea, etc.

The therapeutic agent can be controlled by spraying with dimethomorph or metalaxyl, and used continuously for 2-3 times.

3. Citrus disease (brown rot)

The disease is prone to occur in the hot and rainy seasons and mature stages. At the beginning, the leaves are infected with yellow or brown spots, and then slowly spread into round or elliptical lesions; after the petals are damaged, they gradually spread and the whole petals become dry; Under wet conditions, there will be a gray mold layer on the stems and leaves; in the leaf sheath, black sclerotia may be produced on the surface of the bulb or in the soil, which may occur year after year.

10 common disease control measures for citrus

Be sure to take precautions to avoid serious damage. Because it is easy to develop under high temperature and high humidity conditions, it is necessary to strengthen ventilation, pay attention to ditch drainage, so as not to cause too much water in the orchard, causing serious reduction of citrus production! The diseased plants are found to eradicate burning and eliminate germs.

During the maturity period and the hot and rainy season, it is necessary to pay attention to the spraying prevention and control. In the high temperature and high humidity season, the spraying of mancozeb and isoform urea should be carried out in time. In the early stage of the disease, it can be sprayed with dimethomorph, formazan and carbendazim. Control, continuous spraying 2-3 times.

10 common disease control measures for citrus

4, citrus resin disease

Citrus resin disease is a weak parasitic fungal disease. It may be said that some people are unfamiliar with resin disease, but when it comes to gum disease and sand skin disease, everyone knows that these diseases are caused by the same pathogen. Generally, the disease infesting branches is called resin disease or gum disease; the damage to the skin and leaves is called black spot disease or smut disease. In the event of serious accidents, large areas of citrus are destroyed, or a large amount of rotten fruit is caused during transportation.

10 common disease control measures for citrus

1 flow gel type occurs mostly on the trunk of the main branch and the lower part of the trunk. The cortex of the diseased part becomes gray-brown and necrotic, and the brown mucus exudes a foul smell; 2 dry type: the skin of the diseased part is reddish brown, slightly Sinking, there is a clear boundary between the disease and health junctions.

The leaves and fruits are called "sand skin disease", and the damaged leaves and young fruits have many small brown spots on the surface, like sand, and the surface is rough, so it is called sand skin disease. As shown below:

10 common disease control measures for citrus

Control method:

1 to 2 weeks before the frost, the orange orchard is fully watered once or laid on the ground to do a good job in cold protection. During the frost period, the orange garden grass smoked smoke also has anti-freeze effect.

Trim the diseased branches and concentrate them slightly to eliminate the source

When the branches are onset, clean the necrotic and decaying tissue, use the blade to draw a few strokes on the branches, and brush the branches with the special disease of the gelatinism to kill the residual germs of the xylem. Apply continuously for about 3 times, interval 5 -7 days once a drug.

Preventive agents: captan, chlorothalonil, mancozeb, etc.;

Therapeutic agents: carbendazim, atropine, difenoconazole, flusilazole, etc.

10 common disease control measures for citrus

5, citrus canker disease

The disease mainly harms citrus leaves, shoots and fruits. Fruits will fall when the fruit is seriously damaged. If the damage is not serious, it will have a raised disease, which will seriously affect the value of the fruit and will cause certain economic losses to the fruit farmers. In areas with high temperature and high humidity in citrus-growing areas, this condition is beneficial for the propagation of pathogenic bacteria. Bacteria have strong survivability and can be hidden in various parts of the plant. They are sprayed on the rainy days with rainwater, and when the conditions are appropriate, they begin to infect the plants and break out the ulcer disease. Citrus canker disease is important in prevention and early prevention and treatment. It is necessary to adhere to the continuous use of the drug for the anniversary. If you do not see the control effect, stop using the drug. Because there are some potential germs that we can't see, stopping the drug will still infect the bacteria under certain conditions. Plant. Be sure to seize the opportunity and choose the right agent for prevention.

10 common disease control measures for citrus

Drug prevention: copper hydroxide, cuprous oxide, etc.;

Medicament treatment: agricultural streptomycin, streptomycin sulfate, chunleimycin, neutrophin, etc.

10 common disease control measures for citrus

Antibiotic fungicides :

Imported agricultural streptomycin, special effects of bacterial diseases, avoid mixing with alkaline agents

90% neomycin, a special effect of bacterial diseases, both protective and therapeutic, not suitable for mixing with alkaline agents

85% streptomycin sulfate is mainly effective against bacterial diseases, many of which are used in flowers and cannot be mixed with alkaline agents.

Zhongshengmycin, a protective fungicide, has good control effect against bacteria and some fungi, and should not be mixed with alkaline agents.

Control measures for citrus scab

6, citrus scab

The disease is a fungal disease that occurs in the orchard growing areas, mainly affecting leaves, new shoots, petals, and young fruit.

After the leaf lesions were lignified, the back of the leaves protruded, the leaves were sunken, and the back of the leaves was conical. The symptoms of the new shoots and the leaves are basically the same, but the symptoms of the leaves are not obvious; the petals are quickly detached; when the young fruit is lightly damaged, the surface is rough, the fruit is small, the taste is sour, or it is a deformed fruit.

Preventive agents: chlorothalonil, mancozeb;

Therapeutic agents: atropine, carbendazim, difenoconazole and the like.

10 common disease control measures for citrus

7, citrus lipid spot yellow spot disease

Preventive agents: chlorothalonil, mancozeb, etc.; therapeutic agents: carbendazim, ether oxystrobin, difenoconazole and the like.

10 common disease control measures for citrus

8, citrus scab

It mainly occurs on the old leaves, with a slight depression of yellow-white lesions and a halo blur.

The lesion was sunken around, the edges were dark brown, and black spots were formed at the end of the lesion.

The center of the lesion is sag, the late edge is slightly raised, and the diseased part is filled with black particles.

10 common disease control measures for citrus

Preventive agents: mancozeb, etc.;

Therapeutic agents: ether oxystrobin, difenoconazole, carbendazim, formazan, and the like.

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