Prevention and treatment of canker of navel orange

Navel orange is a common and suitable fruit in our life, which is loved by many people, but it is extremely harmful to canker disease when planting, and the incidence of canker disease is higher than other diseases. With the development of navel orange industry, this disease is becoming more and more serious, seriously endangering the development of navel orange industry. So how to prevent navel orange ulcer disease? Let's take a look at it together with Xiaobian.

1. Symptoms

Canker disease will harm leaves, fruits and branches, leaves infected, petioles will appear yellow or yellow-green oily spots, spots will be enlarged round, the lesion will be broken epidermis, the central crack is crater-like, surrounded by yellow halo. When the branches and fruits are infected, the symptoms are similar to those of the leaves, while the diseased spots on the branches are raised higher, but there is no yellow halo. The fruits have yellow halo when they are immature, and the halo disappears after maturity.

2, the incidence of law

Canker disease is a bacterial disease, its pathogen in leaves, branches or fruits latent winter, especially in autumn shoots, so that its main latent place. After waiting for the spring of the next year, the temperature will warm up, it will start to spread with the help of wind, insect rainy season branches and leaves contact, improve stomata, or wound invasion, latent for about a month to start the disease. Generally in the high temperature rainy season high incidence period, in the plant every time the fruit or shoot can attack, and navel orange itself is easily infected with the disease.

3. Preventive measures

For this disease, preventive measures should be taken first. After harvest in autumn and winter, the garden should be thoroughly cleaned, the residual branches and leaves and infected branches, leaves and fruits should be burned or buried deeply to reduce pathogens, and fungicides should be sprayed in the whole garden to kill pathogens. Do a good job of fertilizer and water management of plants, apply sufficient base fertilizer, increase phosphorus and potassium fertilizer, improve the disease resistance of plants, at the same time pay attention to drainage and ventilation, reduce the humidity between gardens. In addition, the disease is mainly invaded by wounds, so it is necessary to prevent plants from being injured, so as not to give the bacteria an opportunity to take advantage of it.

4. Medication

After spring, spray Kuihuiling and insecticide once before new shoots germinate, which can eliminate the pest source after winter, and the effect is better. Spraying 2-3 times before summer shoot and autumn shoot, spraying bordeaux mixture and sulfur compound once after clearing garden in winter, and spraying traditional Chinese medicine fungicide all year round.

The above is the navel orange ulcer prevention method introduction, hope to help you, want to know more related knowledge, please pay attention to us.