Comprehensive Control Methods for Underground Pests of Chinese Medicinal Herbs

1. Deep winter ploughing: plough the soil to 35cm to destroy the living and overwintering environment of pests and reduce the pest population density the following year.

2. Manure treatment: Undecomposed farmyard manure is a place where underground pests lay eggs and reproduce. Therefore, fully decomposed farmyard manure should be applied to medicinal plants, and when applying it, 500g of 5% carbaryl per mu should be used for harmless treatment, with good results.

3. Cleaning the field: After harvesting the previous crop, promptly remove weeds from the field to reduce the number of overwintering larvae and pupae. At the same time, during the growing period of the medicinal herbs, promptly remove all weeds from the field, bury them deeply or transport them out of the field for composting.

4. Seed dressing with chemicals: Use 1kg of 3% carbofuran granules per mu for seed dressing, which can control underground pests such as wireworms, mole crickets, white grubs, yellow ants and cutworms.

5. Root irrigation with chemicals: When pests occur at the seedling stage, if broken seedlings are found and larvae enter the soil, use a 6000-fold dilution of 2.5% deltamethrin or a 4000-fold dilution of fenvalerate to irrigate the roots once every 8-10 days, for 2-3 consecutive times, which can kill underground pests such as cutworms, white grubs and wireworms.

6. Broadcasting poisoned soil: Use 500g of 50% phoxim emulsifiable concentrate per mu, mix with 25-30kg of fine sand or fine soil, open a furrow beside the roots of the medicinal plants and spread it in, then immediately cover with soil or apply the poisoned soil in combination with intertillage, which can control various underground pests.

7. Trapping and killing adults: Effective methods for trapping and killing adults usually include: ① Adults of scarab beetles, cutworms and mole crickets have a strong tendency toward black light, so place black lights during the peak emergence period of adults to trap and kill them. ② Dilute 100g of 20% methomyl emulsifiable concentrate with 1kg of water, spray it onto 100kg of fresh grass or chopped vegetables (about 16cm long), and mix into 25kg of poisoned bait to trap and kill cutworms, with relatively good results.

8. Applying chemicals on the ground: Spray a 2000-fold dilution of 2.5% deltamethrin on the ground in the evening, which can control various underground pests in medicinal herb seedling beds.

9. Applying chemicals to plants: When medicinal herb seedlings show damage symptoms such as holes and notches, spray the leaves with an 800-1000-fold dilution of 90% trichlorfon, or a 1000-1500-fold dilution of 50% diazinon emulsifiable concentrate. During the adult occurrence period, spray once every 7-10 days in the evening, for 2-3 consecutive sprays to control the pests.

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