Cultivation and pest control techniques of Artemisia annua L.

First, cultivation techniques 1. Select the fields with fertile, loose, good water and fertilizer conservation and convenient drainage and irrigation. two。 The varieties of Artemisia annua can be divided into two types: large-leaf varieties and small-leaf varieties, and small-leaf varieties are mainly selected for greenhouse cultivation. Leaflet varieties are more cold-tolerant, the growth period is 40-50 days. 3. Sowing method 3.1 soak the seeds for 24-28 hours before sowing, remove them and put them in the environment of 15-20 ℃ to accelerate germination, keep moist, and rinse once a day. 3.2After ploughing and fine finishing, the planting field is made into a border with a width of 1-1.2m and a length of 10-15m, with 3500-4000 kg of rotten barnyard manure per mu and 15-20 kg of ternary compound fertilizer as base fertilizer. 3.3 planting methods can be either strip sowing or sowing. The row spacing of strip sowing is 8-10 cm, the sowing area is 5-6 cm, and the amount of seeds used per mu is 2.5-3 kg. It can also be sowed on demand, with a density of 3.5 cm and a seed consumption of 0.85 kg per mu. After sowing, cover 1 cm of soil, and cover the plastic film, after emergence, remove all the plastic film. 4. Field management to keep the border surface dry and wet, 1-2 true leaf stage, inter-seedling and pull out weeds, keep the distance between seedlings about 4 cm. Pay attention to often observe the humidity in the shed to avoid excessive moisture. The first topdressing of urea was carried out in 4 true leaves of the plant, and the second fertilizer was applied in 8-10 true leaves and 7.5-10 kg urea per mu. About 40 days after sowing, it can be harvested when the seedling is about 15 cm high, and can be cut with a knife, scissors or pinched by hand. 1-2 days after harvest, 7.5 kg urea per mu was applied to promote the blooming of lateral branches. After that, it will be harvested every 20 days or so until it blossoms. 2. Pest control techniques the common diseases and insect pests are leaf blight, downy mildew, brown spot, leaf miner, whitefly, aphid and so on. Prevention of diseases and insect pests should be given priority. Comprehensive measures such as strengthening field management, doing a good job of pastoral cleaning and selecting disease-resistant varieties should be adopted, and chemical control should choose pesticides with high efficiency, low toxicity and low residue. Leaf blight can be sprayed with 1500 times of 50% prohydantoin wettable powder or 1500 times of 50% carbendazim wettable powder and used alternately. Downy mildew can be sprayed with 64% disinfectant alum wettable powder or 75% chlorothalonil wettable powder 500 times. Brown spot can be sprayed with 80% Dasheng wettable powder 500 times or 78% Cobo wettable powder 500 times. Usually spray once every 7-10 days, and spray 2-3 times in a row. Leaf miners can be sprayed with 2.5% cypermethrin, or 4.5% cypermethrin 2000 times, or 0.9% mik 1500-2000 times, or 1.8% mik 3000-4000 times. Aphids can be sprayed with 1000-2000 times EC of 10% aphid lice or 4.5% cypermethrin 1500 times to control whitefly. Stop taking medicine 15 days before harvest.