Jujube witches' broom is a devastating disease of jujube trees. The occurrence of jujube witches' broom usually shows symptoms on some branches and tillers, and then gradually spreads to the whole tree. Young trees generally die 1-2 years after the onset, and big trees generally die gradually in 3-6 years after infection. Once the disease occurs, it rarely bears fruit in the second year, and eventually the whole plant dies, which is a great threat to production. It occurs in all jujube areas in the north and south of China, but it is the most serious in Sichuan, Guangxi, Yunnan and Chongqing.

therapeutic method

(1) It is the source of disease transmission to thoroughly eradicate the diseased trees and seedlings with serious roots and cut off the diseased plants of jujube witches' broom in time. In addition, jujube trees will spread all over the whole plant soon after the onset, losing the ability to bear fruit. It is necessary to thoroughly eradicate the diseased plants as soon as possible, and plant the big roots together to avoid tillering seedlings again. For small crazy branches, before the juice flows back to the roots, the source of Bacteroides should be prevented from flowing down with the nutrient of the tree, and it should be cut off or girdled from the base of the big branches. Continuous treatment for 2-3 years can basically control the occurrence of jujube witches' broom.

(2) Cultivate disease-free seedlings, and disease-free jujube orchards should adopt scions, buds or roots to cultivate disease-free seedlings. Once the diseased seedlings are found in the nursery, they should be pulled out immediately.

⑶ Select disease-resistant varieties and rootstocks, pay attention to finding and using disease-resistant varieties, select disease-resistant jujube and jujube varieties with jujube kernel as rootstocks, and cultivate disease-resistant varieties. This is the fundamental measure to prevent jujube madness.

(4) When planting tillers with roots, the method of in-situ propagation of tillers should be strictly selected and avoided, because this method is easy to cause the spread of diseases because the offspring have the same root as the mother plant.

5] Drug treatment For jujube trees with mild illness, tetracycline drugs are used twice a year. For the first time, before the sap flows out in early spring, drill three rows of holes along the trunk of the diseased plant 50-80 cm, or girdle it, and then insert cotton wool soaked in 400-500 ml of 250 times "Fancong Ling Liquid", wrap it tightly with plastic sheets and trim it at the same time.

The second time in autumn, before the juice returned to the roots (65438+ 10 month), it was applied again in the same way, and the effect on the mild disease tree was remarkable.

You can also drill four holes around the diseased trunk in summer to reach the xylem, insert a plastic flask (designed by the Plant Protection Department of Henan Agricultural University), seal the holes with wax, and inject 400 ml of "facongling" solution into each plant. After more than 65,438+00 hours, the liquid will be absorbed and the diseased branches will gradually burn. The curative effect is similar to that of the application tape. This method is simple and the liquid medicine is not easy to lose.

[6] Eliminate weeds and wild shrubs, and prevent and control all kinds of leafhoppers in time. From the beginning of June to the end of September, spraying 2% avermectin 3000 times solution, 2.5% beta-cypermethrin 2000 times solution or chlorhexidine 1.500 times solution to control various pests.

(7) Strengthen jujube orchard management. Pay attention to water and fertilizer management. For those with poor soil conditions, deepen the holes, increase the application of organic fertilizer, phosphorus and potassium fertilizer, and apply 200 g /667 m2 of soilless deep tillage treatment agent and 250-300 g /667 m2 of "Baode" soil microbial agent to loosen the soil, improve soil properties, improve soil fertility and enhance the disease resistance of trees.

(8) Scientifically use "Tianda 2 1 16" and spray other pesticides every 1 0-5 days, and spray1time 1000 times "special type for fruit trees" 2/kloc-.

Agricultural control

(1) Jujube trees suffering from jujube witches' broom do not need to be uprooted. It is better to save a tree than to plant a seedling. Jujube orchard should deal with jujube witches' broom as soon as possible, and at the same time deal with jujube trees with a diameter of 5 meters to prevent other healthy jujube trees from being infected by their roots.

(2) Use the special root irrigation agent for jujube witches' broom in Jinan Qite Agricultural Science and Technology Co., Ltd. to irrigate the roots, and there is no need to prune the branches and leaves during the growth period. Before the germination of the following spring, the tiny Mao Mao branches and fork branches will be pruned, the newly grown leaves will return to normal, and the jujube trees will return to normal fruits.