Control techniques of diseases and insect pests of Radix Pseudostellariae

The principle of "prevention first and comprehensive control" should be adhered to in the prevention and control of pseudostellaria heterophylla diseases and insect pests. Biological pesticides should be selected first and chemical pesticides should be selected second. Pesticides with high efficiency, low toxicity and low residue should be restricted in chemical control. The spraying concentration, dosage per mu and application times should be strictly controlled. It is strictly prohibited to use any pesticides within one month before the harvest of pseudostellaria heterophylla.

Pseudostellaria virus disease

[Harm characteristics] Virus disease is the most important and important disease of Pseudostellaria heterophylla. The leaves of the affected plants are wrinkled and mosaic, the plants are withered early, and the root tuber is thin and small. This disease occurs widely in the production area, with an incidence rate of up to 70%. It seriously harms and affects the yield and quality of Pseudostellaria heterophylla.

[Control methods] ① Select disease-resistant varieties.② It is best to plant with seeds, which have few mosaic diseases and high yield. Seeds treated at 0℃ for 50 days or so can be sown and seedlings without poison can be cultivated. (3) To establish virus-free plucking fields for large-scale production. Self-propagation and self-breeding of their own seed, stay in the field in the growing season must be found at any time to remove the mosaic plant, reduce infection. Timely pest control and disease prevention to ensure that seedlings do not carry poison. After virus disease is discovered, virus must be selected, virus A and other agents for prevention and control.

[Precautions] The main disease of Radix Pseudostellariae is virus disease, which should be removed in time after discovery. After May, black spot and powdery mildew also occurred. 50% mancozeb 500 times solution and 15% triadimefon 1000 times solution were used to control them. Pseudostellaria heterophylla likes wet plot, must water immediately when drought, at the same time, cloudy waterlogging days must also be drained in time, otherwise, will cause rotten roots, affect yield.

Pseudostellaria leaf spot

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

[Control methods] ① Remove residual leaves of diseased plants and reduce overwintering bacteria sources. (2) At the early stage of the disease, spray 1000 times solution of Polyoxycycline (Polyoxycycline) to control the disease, and at the middle and late stages, 70% Mancozeb 800 times solution can be used to control the disease. Leaf fertilizer, yield-increasing bacteria, dry land dragon, etc. should be added appropriately at each application to enhance the ability of disease resistance and drought resistance and increase yield.

root rot of Pseudostellaria heterophylla

[Harm characteristics] When root rot occurs, the fibrous root turns brown and rots first, and then the whole root rots. It is easy to occur in high temperature and high humidity season in July and August, so pay special attention to timely drainage after rain.

[Prevention and control methods] ① Thoroughly clean up dead branches and residues after harvest and burn them intensively. 2. Implement rotation, not continuous cropping. (3) At the early stage of disease, 50% carbendazim, 70% thiophane, 75% chlorothalonil and 25% metalaxyl can be used to irrigate the diseased plants.

Pseudostellaria heterophylla

[Main species] White grubs, ground tigers, mole crickets, insects, etc. can harm the growth and development of ginseng seedlings and roots, and should be killed in time.

[Control methods] ① Apply fully decomposed manure and adopt high temperature compost. Light traps adults. (3) Spraying 0.1% Lesben or irrigating root with 500 times solution of Dichongle.