Root cancer disease is also called crown gall disease. Sakura and rose root cancer mainly occur at the root neck, but also in the roots and the ground. At the beginning of the disease, a nearly round, small nodule appeared, which gradually increases and hardens. The surface is rough, cracked, and the color changes from light to dark brown or dark brown, and the tumor is internalized with lignification. The tumors range in size from large to large fists or larger, with numbers ranging from a few to a dozen. Due to the destruction of the root system, the diseased plant grew slowly, and the entire plant died. In addition to harming cherry blossoms and Chinese rose, the disease can also damage more than 300 plants such as dahlia, clove, begonia, geranium, rose, plum, and forest trees and fruit trees. The onset of pathogenic bacteria in the epidermis of the disease-causing epidermis and in the soil survived winter, with the diseased tissue residues in the soil can survive for more than 1 year. The pathogens are transmitted by water flow, underground pests, grafting tools, and working implements, and diseased seedlings and species transport can be spread over long distances. After the bacteria invade from the wound, symptoms are manifested for several weeks or more. Alkali, high humidity in sandy soil in the high incidence, continuous cropping in favor of disease, root wounds are often heavy. Prevention and control methods 1 strengthen quarantine, seedlings suspected of disease can be used 500-2000ppm streptomycin solution soak 30 minutes or 1% copper sulfate soak 5 minutes, rinse after clean water planting. In case of severe wards, two years or more rotations or the use of chlorine to sterilize the soil and plant them. 3 Carefully cultivated to avoid various wounds. 4 to change the connection to bud, grafting utensils can be disinfected with 0.5% potassium permanganate. 5 Severely ill strains should be removed. Mild diseased strains can be watered with 300-400 times the "402", or after the tumors are cut and wounded with 500-2000 ppm streptomycin or 500-1000 ppm erythromycin or 5% ferrous sulfate. It was also reported that the use of methyl iodide iodine solution (50 parts of methanol, 25 parts of glacial acetic acid, and 12 parts of iodine tablets) had a therapeutic effect on tumors; Agrobacterium tumefaciens 84 could be used for biological control.
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