The latest prevention and control methods of canker in navel orange

Navel orange is a common suitable fruit in our life, which is loved by many people, but canker does great harm to it when planting, and the incidence of canker is also higher than that of other diseases. With the development of navel orange industry, the disease is becoming more and more serious, which seriously endangers the development of navel orange industry. So how to prevent and cure navel orange canker? Let's have a look with the editor.

1. Symptoms

Canker disease can harm leaves, fruits and branches. After the leaf is infected, the petiole will appear yellow or yellowish green oily spots, the spots will be round when enlarged, the epidermis of the lesion will break, the central cracking is crater-like, and there is a yellow halo around it. When the branches and fruits are infected, the symptoms are similar to those of the leaves, while the disease spots of the branches are higher, but there is no yellow halo. The fruit has a yellow halo when it is not ripe, and the halo disappears after ripening.

2. The regularity of the disease

Canker is a bacterial disease. Its pathogen overwinters in leaves, shoots or fruits, especially in autumn shoots, making it the main latent place. Waiting for the spring of the following year, when the temperature warms up, it will spread with the help of the wind, insect contact with branches and leaves in the rainy season, increase stomata, or wound invasion, and lurk for about a month or so. Generally in the high temperature and rainy season, the disease can occur every time the plant bears fruit or shoots, and the navel orange itself is very easy to be infected with the disease.

3. Preventive measures

First of all, preventive measures should be taken against this disease. after harvest in autumn and winter, the garden should be cleared thoroughly, the residual branches and fallen leaves and infected branches, leaves and fruits should be burned or buried deeply, the pathogen should be reduced, and fungicides should be sprayed in the whole garden to kill germs. Do a good job in plant fertilizer and water management, apply sufficient base fertilizer and increase phosphorus and potassium fertilizer to improve plant disease resistance, but also pay attention to drainage and ventilation to reduce inter-garden humidity. In addition, the disease is mainly invaded by wounds, so it is necessary to prevent plant trauma so as not to give germs a chance to take advantage of.

4. Medication treatment

After the beginning of spring, before the new shoots are about to germinate, spray Kuifuling and insecticides, which can eliminate the source of diseases and insect pests after overwintering, and the effect is better. Spray 2-3 times in front of summer and autumn shoots, spray Bordeaux solution and stone vulcanization mixture once after agricultural streptomycin clearing garden in winter, or spray traditional Chinese medicine fungicides all the year round.

The above is the introduction of navel orange canker prevention and treatment methods, hope to help you, want to know more related knowledge, please follow us.