Control methods of diseases and insect pests of Salvia miltiorrhiza

1. Leaf spot is a bacterial disease. There are nearly round or irregular dark brown spots on the leaves, which enlarge and converge in severe cases, resulting in the death of the leaves. It starts at the beginning of May and continues until the end of autumn. Prevention and treatment methods: remove the diseased leaves at the base, improve ventilation conditions, pay attention to drainage; clear the garden in winter, deal with residual plants.

2. The stem base, bud head and rhizome of the plant infected by Sclerotinia sclerotiorum gradually rotted and turned brown, and there were black mouse fecal sclerotia and white mycelium in the diseased site and nearby soil surface and inside the stem base, and the plant withered and died. Prevention and control methods: strengthen field management, timely ditch drainage; implement flood and drought rotation.

3. Root rot occurred from May to November. The root of the diseased plant decayed first, and the skin was black. At the beginning of the shoot, a few stems and branches withered first, and in severe cases, the whole plant died. Prevention and control methods: rotation, not continuous cropping; select land with high dryness and good drainage, pay attention to drainage in rainy season, select strong and disease-free seedlings, and irrigate with 80-1000 times of topiramate at the initial stage of the disease.

4. Root-knot nematode disease forms many nodules on the fibrous root, and the aboveground part of the plant is short and yellow, which is caused by the parasitism of root-knot nematode. Control methods: establish disease-free fields and implement quarantine to prevent breeding materials with disease from entering disease-free areas; rotation with Gramineae crops without continuous cropping.