Sakura crown disease is a national quarantine subject and it is the main disease of cherry blossoms. In the south of the city, the towns of Simingshan and Daxie are the main cultivation areas, and they are also the main cultivated varieties of people in the mountainous areas. In recent years, the area has continued to expand, but diseases have occurred. This has restricted the enthusiasm of people in mountainous areas to develop cherry blossoms. The pathogen mainly occurs in the base and roots of seedlings and saplings, and sometimes occurs in other parts of the root. In the early stages, grey-white nodules were formed in the damaged area, which was difficult to differentiate by callus. However, it was faster than callus development. Afterwards, the smooth, soft nodules gradually became irregular and the surface changed from gray to brown. Dark brown. Many small tumors appear on large tumors. The surface is rough and cracked, the texture is hard, the surface cells die, the internal lignification, and some fine roots are generated around the tumor or on the surface. Finally, the exoskeleton fell off, exposing many protruding small tumours. The internal tissue of the tumor is disordered. The mixed parenchyma and vascular tumors are usually round, with a diameter of 1-4 cm and a maximum of 30 cm. The damaged trees are debilitated. If the tumors on the neck and trunk are ringed for one week, the growth tends to be stagnant, and the leaves turn yellow and fall early, and even die. In order to carry out the prevention and treatment of cherry crown gall disease, in 2003 I station to organize the prevention and treatment of the disease, achieved good results, and played a positive role in controlling the occurrence and harm of crown gall disease. It is currently in the cherry planting season. Now we introduce the test medicines as follows for the reference and application of flower growers. 1. Soluble streptomycin sulfate soluble powder is soaked in 500 ppm for 30 minutes, 1000 ppm for 25 minutes, and 1500 ppm for 20 minutes, followed by rinsing with fresh water followed by cultivation. 2. Soluble powders of penicillin sodium are soaked in 500 ppm for 30 minutes, soaked in 1000 ppm for 25 minutes, soaked in 1500 ppm for 20 minutes, and then rinsed with fresh water. 3. Prepare 99% copper sulfate (CuSo45H20) crystals into 1%-2% copper sulfate solution, and soak them in 100-fold solution for 5 minutes, 150-fold solution for 10 minutes, and 200-fold solution for 15 minutes. The soaked seedlings were soaked in quick lime 50 times for 1 minute, and then planted separately. The above-mentioned three kinds of agents have control effects of 99.3% to 100%. The soil of the nursery can be treated with sulfur powder, ferric sulfate or bleaching powder 10-30 kg per mu for soil disinfection.
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