The cultivation of jujube trees in China has a history of thousands of years. In the past 20 years, due to the higher economic benefits of planting jujube, the planting area of ​​jujube trees has continued to expand. It is only cultivated area of ​​Binzhou City in Shandong Province and Huangju City in Hebei Province. It reached more than 1 million mu. With the expansion of the planting area, the disease prevention and control of jujube trees has also been increasingly concerned by the jujube farmers. It is currently in mid-July and is in a hot and rainy season. At this time of year, anthrax often begins to occur. The author recently talked with the juvenile farmers in the countryside and learned that the juvenile farmer's rule on the incidence of anthrax is still unclear. Therefore, he wrote an article for reference by jujube farmers.
After the onset of symptoms of the disease, the diseased part or the jujube's waist is the most vulnerable. It initially turns light yellow, and then there are water-stained spots. It gradually expands into irregular yellow-brown patches, with a round depression in the middle, and the diseased patches appear red. Brown, causing the fruit to fall early, the falling kernels of the early falling fruit become black. When the weather is wet, small yellow-brown spots form on the lesions, and the diseased fruit becomes brown and tastes bitter. After drying, only the cores and filaments are attached to the skin and cannot be eaten. Anthracnose disease, low sugar content of the pulp, poor quality, most can not fall off, non-susceptible part of the fruit can be normal coloring, the incidence of more and more severe near the time of maturity, anthrax disease once infected in fruit infected with the disease, The occurrence of fruit brown lesions is very rapid and serious fruit drop. After jujube hanging, jujube head, and jujube stocks were infected, they did not show symptoms in the early stage but existed in a latent state. The pathogens used mycelia to overwinter on the jujube hangings and jujube heads and jujube stocks, and became the next year together with the diseased berries. At the beginning of the disease.
Incidence of disease jujube anthracnose disease is generally heavier from mid-July to mid-August. Bacteria are transmitted by dew and wind and rain, and the onset of the disease is related to rainfall sooner or later. If the rains are relatively diligent in June, the disease will usually start from late June, and the onset of drought will be mild or non-occurring. The leaves suffered yellowing or yellowing, and some were dark brown and brown and hanging branches. Anthracnose generally occurs sporadically. If it can be prevented and treated in time, generally it will not cause great harm. Sometimes anthrax is also often cross-infected with fruit shrinking disease and rot disease.
Control measures 1. Clear up the date garden, under the canopy can be sprayed or sprayed 2 kg (per mu) "free deep plowing," enhance the permeability of the soil under the canopy. Combine pruning in the spring and remove the remaining diseased jujube hanging from the jujube tree and burn it. 2. Drug control: Entering into the middle of July is the key time for preventing and curing jujube anthracnose. It can be sprayed with 800 times liquid thiazole zinc and 6000 times natural brassin “Shufeng 481†or 1:2 in early July. : 200 Bordeaux fluid, spray once every 7-10 days, even spray 2 times. Before onset or early onset, it is also possible to spray 50% carbendazim 700 times and 6000 times the natural brassin “Shufeng 481â€, which has a good effect on the prevention and treatment of anthrax.
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