The latest course on the techniques and methods of Pest Control of Radix Pseudostellariae

The prevention and control of diseases and insect pests of Radix Pseudostellariae should adhere to the principle of "prevention first and comprehensive control". In chemical control, biological pesticides should be given priority, followed by chemical pesticides, and pesticides with high efficiency, low toxicity and low residues should be used in chemical control. Spraying concentration, dosage per mu and application times should be strictly controlled, and the use of any pesticide is strictly prohibited within one month before harvest.

Radix Pseudostellariae virus disease

[hazard characteristics] virus disease is the most important and important disease of Radix Pseudostellariae, the leaves of the affected plants are wrinkled and mosaic, the plants wither early, and the roots are thin and small. The disease is common in the producing areas, and the incidence rate is as high as 70%. Seriously harm and affect the yield and quality of Radix Pseudostellariae.

[control methods] resistant varieties were selected for ①. ② is best planted with seeds, the incidence of mosaic disease is rare, and the yield is high. After the seeds were treated with low temperature of 0 ℃ for about 50 days, the non-toxic seedlings could be cultivated. ③ should establish virus-free harvesting fields for large-scale production. For those who breed themselves and keep their own seeds, they must be found to pull out mosaic plants at any time in the growing season to reduce infection. Timely pest control and disease prevention to ensure that the seedlings are free from virus. After the discovery of virus disease, we can choose virus Bike, virus An and other agents for prevention and treatment.

[note] the main disease of Radix Pseudostellariae is virus disease, which should be removed in time after discovery. Black spot and powdery mildew also occurred after May, and 50% mancozeb and 15% triadimefon 1000 times were used for control. Prince ginseng likes wet land and must be watered immediately when it is drought. at the same time, it must also be drained in time on overcast and waterlogged days, otherwise it will cause rotten roots and affect yield.

Prince ginseng leaf spot

[harm characteristics] Leaf spot disease often occurs in the rainy season in spring and summer, and round or irregular brown spots often appear on the leaves of diseased plants. When the disease is serious, it can lead to brown death of leaves, resulting in smaller ginseng roots and lower yield.

[control method] ① can remove the residual leaves of diseased plants and reduce the source of overwintering bacteria. In the initial stage of the onset of ②, Polyoxin was sprayed with 1000 times solution, and 70% mancozeb solution was used in the middle and later stage. Foliar fertilizer, yield-increasing bacteria and dryland dragon were properly added each time to enhance disease resistance and drought resistance and increase yield.

Root rot of Prince Ginseng

[hazard characteristics] when root rot occurs, the fibrous root turns brown and rotten at first, and then the whole root decays. It is easy to occur in high temperature and humidity season in July and August, so pay special attention to ditch drainage in time after rain.

[control methods] after harvest, ① cleaned up the dead branches thoroughly and burned them centrally. Rotation is carried out in ②, so it is not suitable for continuous cropping. At the initial stage of the onset of ③, the diseased plants can be irrigated with 1000 times of carbendazim, 70% thiophanate, 75% chlorothalonil and 25% metalaxyl.

Prince ginseng pest

[main species] grubs, ground tigers, mole crickets and golden needle worms can harm the growth and development of ginseng seedlings and roots, and should be killed in time.

[control method] ① was treated with fully mature manure and compost at high temperature. ② light traps and kills adults. ③ sprayed 0.1% Lexben or Di Chong Le 500x solution for root irrigation treatment.