What are the pest and disease control methods for the Chinese medicinal herb Panax notoginseng?

1. Diseases

1.1 Black spot disease occurs mostly in the high-temperature, high-humidity season from June to July, causing plants to twist and break and die. The control method is to adjust the shade shed's light transmittance to below 20%, and spray with 1.5% polyoxin 150-fold solution or 70% chlorothalonil wettable powder 600-800-fold solution.

1.2 Phytophthora blight is a devastating disease of Panax notoginseng at the seedling stage. It occurs mostly from June to July, damaging leaves and petioles. The control method is to strengthen field management, reduce temperature and humidity; promptly remove residues and burn them in a centralized manner, and spray with 65% zineb wettable powder 500-fold solution for treatment.

1.3 Damping-off disease occurs mostly in the high-humidity, low-temperature season from April to May, damaging the base of seedlings. The control method is to drench the roots and spray with 70% dexon wettable powder 500-800-fold solution.

1.4 Root rot is the main root disease of Panax notoginseng. It occurs mostly from late April to early July. The control method is to drench the roots with 58% metalaxyl wettable powder or 50% carbendazim wettable powder 300-500-fold solution.

2. Insect pests

2.1 Slugs (snails without shells). The control method is to sprinkle lime powder on the bed surface on a clear evening.

2.2 Red spider mites. The control method is to spray with 40% dimethoate emulsifiable concentrate 1000-fold solution.

2.3 Cutworms. The control method is to use 90% trichlorfon crystal mixed with poisoned bait for trapping and killing, or apply a 1000-1500-fold solution as a drench.