Jujube disease, commonly known as “public jujube treeâ€, is a devastating disease of jujube trees. In severe cases, it can cause a large number of jujube deaths or even destroy the garden. First, the symptoms identified (1) The initial symptoms appeared after flowering, the performance of floral deterioration and bud germination abnormalities, the leaves grew small and formed branches and leaves clusters, young leaves express veins, yellow and curl spoon-like. (2) The leaves of diseased trees have obvious lesions after flowering. The first is the yellowing of the leaves. The yellowing of the leaves gradually occurs, the edges are rolled up, and the later stages become hard and brittle and dull. (3) The buds on the 1-year-old development branch of the diseased plant and the buds on the perennial development branch, most of which germinate into development branches. The diseased flowers generally cannot produce results; even if the result does not have economic value. (4) In the late stage of disease, the cortex turned brown and rotted, and the diseased tree was not harvested until the whole plant died. Second, the law of jujube can be spread by grafting and rooting. After grafting, the incubation period for disease is from 25 days to over 1 year. Jinsi jujube is most susceptible to disease. The drought of the soil and the management of extensive dates are serious. Third, prevention and control measures Agricultural control: (1) remove the crazy branches, eradicate the strains without economic value. (2) Select disease-resistant jujube varieties as rootstocks. (3) Cultivate disease-free seedlings. That is, in jujube gardens without jujube disease, scion, budding, or rooting are used to breed disease-free seedlings. (4) Strengthen orchard management, increase alkaline fertilizer and farmyard fertilizer. Chemical control: (1) In the early stage of disease, hand drilling was performed to drill holes in the rhizomes of diseased trees. In the budding period of the jujube tree in spring or in October, each diseased tree was instilled with 500 ml of a tetracycline solution with a concentration of 0.1%. (2) Drill 1 hole on both sides of the trunk base or in the middle and lower part of the non-infestation section, deep to the medullary heart, the vertical distance between the two holes is 10 to 20 cm, and the oxytetracycline solution containing 10,000 units is injected with a high-pressure syringe. The trunk diameter of 30 cm or more, the use of liquid 300 to 400 ml; 40 cm or more, with 500 to 700 ml; 50 cm or more, with 800 to 1000 ml; 60 cm or more with 1200 to 1500 ml. (3) In the initial stage of disease, 0.2% ferric chloride solution was sprayed on every 667 square meters of jujube garden and sprayed 2 to 3 times every 5 to 7 days. Each use of liquid 75 kg to 100 kg, for prevention of jujube disease has a good effect.
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