How to prevent Huanglong disease, which is the most harmful to Shatangju?

Citrus is a plant that likes warm and humid climate. It is widely planted in the south of China and is one of the important fruit crops in the south. Because there are many diseases and insect pests in citrus, we should not only prevent trees, but also do a good job in the harm of diseases and insect pests to fruits. Citrus Huanglongbing is a worldwide destructive disease of citrus, which only happened for the first time in Guangdong Province of China. At present, with the expansion and development of citrus planting area, citrus Huanglongbing is also expanding, and the citrus planting provinces have exceeded 10, and the harm of citrus Huanglongbing is happening.

Citrus Huanglongbing is a devastating disease. Because citrus has Huanglongbing, it will do harm to the flowers, leaves, fruits and roots of citrus. Moreover, pathogens can't be cultivated artificially, and there is still some uncertainty in the classification of pathogens, so it is difficult to locate them. Reasonable planting and management is the best way to prevent citrus Huanglongbing.

Citrus Huanglongbing can occur all year round, especially in late summer and autumn. However, the characteristics of disease-resistant plants in different parts of different periods are also different. The main criterion is yellow branches and leaves. Huanglongbing with this disease is the most typical and common disease, mainly because the leaves start near the base and lateral veins, gradually turn yellow or light yellow, rise or expand in the middle, making them irregular macula, and finally the whole leaves look like irregular mottled leaves mixed with yellow and green.

In Huanglongbing of this disease, the new leaves extracted from the diseased area are generally small and sharp, and the veins and green tissues near the veins are yellow-green, and the petals are similar to the element deficiency disease shape of citrus. This disease is more common in the late summer and late autumn of diseased trees. After the new shoots are removed, the new leaves stop turning green in the process of growth and turning green, showing a relatively uniform vulcanization phenomenon, and the leaves are easy to fall off in the later stage. Citrus infection with Huanglongbing is a common symptom. At the first onset, the newly extracted branches, buds and leaves in plants stop turning green when they are close to maturity. Seen from a distance, the top of the tree has an obvious yellow top.

After Huanglongbing, citrus blooms early and has a large number of flowers, but there are many deformities. In the later stage, the fruit becomes smaller, matures early, and the peel is thick and dull, and tastes bitter. The roots rotted and the leaves fell badly, and finally the whole tree dried up. Citrus Huanglongbing can be said that only through prevention can infection be avoided. Then, the conditions required for the occurrence of diseases are also an important part of preventing infectious diseases.

Citrus Huanglongbing is an infectious disease, which can spread and spread through seedlings and ears with bacteria. Generally speaking, the onset temperature of non-introduced varieties is between 27 and 32 degrees Celsius, and the transmission medium of citrus Huanglongbing is citrus mites. Once mites are infected with pathogens, they will get sick and spread diseases for life. Young trees have weaker disease resistance and faster dyeing and development than old trees. The reason is directly related to the media. Citrus mite is a new pest. For example, young trees have many new buds, and citrus mites are also very harmful, so the probability of getting sick will naturally increase. Therefore, the occurrence of citrus Huanglongbing is directly related to our management, which can control the occurrence of diseased seedlings and citrus mites, and is more likely to prevent the occurrence of citrus Huanglongbing.