Symptoms of damage: mainly damage the leaves. After the seedlings were excavated in the spring, round and grayish-white spots appeared on the back of the leaves, and the back surface was cracked with a yellow-brown powder pile, which was the uredia spores and summer spores. In the late stage of disease, all the leaves of the whole plant were covered by the uredia spores, which resulted in the death of the above-ground parts of the plant. The bast tissue proliferated at the junction of the stem base and the root or the stem, and the latent buds germinated. The plants showed their growth and dwarfing. After the summer spores were re-infested, dark brown cyperus spores were scattered on both sides of the leaves, and dark brown brown spore powder was emitted. The disease is the main disease of cultivated licorice, which spreads throughout the main producing areas of licorice, and is the main factor affecting dense planting. Classification properties: Basidiomycotina, Monascus fungi Distribution area: Main licorice producing areas The characteristics of the disease: The germs were mainly responsible for the rust-infested bacteria. The hyphae and teliospores were overwintering on the roots, rhizomes, and dead branches of the plants. Cultivation of high incidence of licorice wild licorice. It was raining in the autumn of the previous year, and the rapid rise in temperature in the spring of the next year would be beneficial. In Yikzhao League, the two-year-old cultivated licorice sporulation strains occurred in mid-May. The diseased strain rate was about 10%. In late June, the diseased strain died and the mortality rate was over 90%. The phosporosis strain occurs in mid-July. Control methods: After the harvest completely remove the field sickness. Select plants that have not been infected with rust and grow robustly; plant seeds in the winter and spring water, and timely cut off the leaves and stems in the fall to reduce the occurrence of diseases. In the early spring, spray 20% triadimefon 1500 times or 97% dichlorphyrin 300 times 2-3 times. Commonly used pharmaceuticals: 20% triadimefon. fold mask machine Dongguan Huitong Automatic Machinery Technology Co., Ltd , https://www.medicalmaskmachines.com