How to prevent and cure root rot of Salvia miltiorrhiza?

How to prevent and cure root rot of Salvia miltiorrhiza? Please introduce Salvia miltiorrhiza root rot: first, harmful symptoms: Salvia miltiorrhiza root rot occurs in the high temperature and rainy season, harming the roots of the plant. At the initial stage, only a few roots or part of the underground rhizome became ill first, and gradually expanded to the whole root system. After the root was killed, the wet rot occurred, and the outer skin was black. in the early stage of the disease, some branches and leaves died, and in serious cases, the whole plant died. Salvia miltiorrhiza producing areas have varying degrees of harm, resulting in certain losses. Second, prevention and control methods 1, the implementation of rotation: due to soil bacteria, continuous cropping of Salvia miltiorrhiza has early onset, serious disease and rapid spread. It is best to rotate with Gramineae crops for 3 ~ 5 years to reduce the number of pathogens and the incidence of disease. 2. Healthy seed retention: select disease-resistant varieties, select strong and disease-free roots, and do not leave seeds in the diseased fields to reduce diseases. 3. Strengthen field management: reasonable fertilization, more organic fertilizer, more phosphorus fertilizer and potassium fertilizer, timely elimination of stagnant water in rainy season, pay attention to loose soil, and improve plant disease resistance. 4. Chemical control: 1 kg / mu 70% dimethicone wettable powder or 50% carbendazim wettable powder mixed with 3 kg of fine soil, sprinkled into the hole when planting, has a certain control effect; cuttings and Reed head disinfection, soak the cuttings and Reed head with 1000 times solution of 50% methylobuxine wettable powder or 70% methyl topiramate wettable powder for 3 minutes, then soak the cuttings and Reed head for 3 minutes after drying. During the growing period, fungicides were irrigated around the roots of diseased plants at the initial stage of Salvia miltiorrhiza disease, which could control the spread of the disease. the commonly used pesticides were 50% carbendazim wettable powder or 50% prednisone wettable powder 500 times, or 96% copper sulfate 1000 times, or 3% agricultural resistance 120 water agent 100 times 150 times, once every 10 to 15 days, for 3 times in a row. Click to get more planting techniques of Salvia miltiorrhiza