1, Tianqi Anthracnose: Anthracnose harms leaves, stems, flowers and fruits of plants, especially leaves. Except the severe cold season, it can occur all year round, especially in the high temperature and rainy period of early spring and summer and autumn. At the initial stage of injury, small yellow spots appeared on the leaves, and then expanded into irregular large spots with yellowish brown edges and slight uplift. After the injury, it gradually turns yellow and becomes transparent at the victim. Some injuries are in veins, blade tips, leaf margins, etc. Then the center sinks slightly, and some lesions are perforated in the later stage.

Control methods: ① Except selecting disease-resistant varieties, disinfect the seeds, soak them in 50 times of 25% carbendazim wettable powder for 30 minutes, take them out and dry them in the shade, and sow them the next day. At the initial stage of the disease, 50% carbendazim wettable powder 500 times, 50 cages of Tobuzin wettable powder 500 times, 75% chlorothalonil wettable powder, or 80% anthrax thiram wettable powder 800 times can be sprayed, all of which have good control effects. (2) high ridge cultivation, timely drainage and intertillage after rain to reduce the incidence; ③ Remove diseased plants and fruits in time to reduce the source of disease.

2. Powdery mildew of Panax notoginseng:

Powdery mildew is a serious disease of Panax notoginseng. White spots appear on both sides of the damaged leaves, like a layer of white powder. If it is not prevented in time in 7 ~ 10 days, the damaged leaves will turn yellow and fall off after half a month, resulting in dry stems and premature fruits.

Prevention and control methods: ① Cross spraying with 200 ~ 300 times of Bordeaux mixture and 0.2% sulfur mixture every 2 ~ 3 days 1 time; ② Spraying 25% carbendazim wettable powder 500 times, or 2000 times of 25% triadimefon wettable powder, or 2000 times of Nongkang120.

3, Tianqi rust:

Stripe rust mainly damages leaves, mostly in March-September, and harms Panax notoginseng, which is more than 2-3 years old. Yellow rust first appeared, and then the lesion gradually spread to the stem, the leaves rolled lightly and the stem withered seriously.

Control method: The mixture of Bordeaux solution and sulfur solution is sprayed alternately, and after the leaves of Panax notoginseng, it is sprayed every 7 days 1 time, so that there are smooth colloidal layers on both sides of the leaves, which makes it difficult for rust powder to enter the mesophyll of the leaves.