Latest Tutorial on Pest and Disease Control Techniques for Pseudostellaria heterophylla
Pest and disease control for Pseudostellaria heterophylla should adhere to the principle of “prevention first, integrated control”. For chemical control, biological pesticides should be given priority, followed by chemical pesticides. In chemical control, high-efficiency, low-toxicity and low-residue pesticides should be used in a restricted manner, and the spray concentration, per-mu dosage and application frequency should be strictly controlled. No pesticide of any kind may be used within one month before harvesting Pseudostellaria heterophylla.
Pseudostellaria heterophylla viral disease
[Damage characteristics] Viral disease is the most important and most significant disease of Pseudostellaria heterophylla. Affected plants show wrinkled leaves and mosaic patterns, the plants wither early, and the tuberous roots are thin and small. This disease occurs commonly in production areas, with an incidence rate as high as 70%, severely harming and affecting the yield and quality of Pseudostellaria heterophylla.
[Control methods] (1) Select disease-resistant varieties. (2) It is best to grow from seeds, as mosaic disease occurs very rarely and yields are high. Seeds treated at a low temperature of 0°C for about 50 days before sowing can produce virus-free seedlings. (3) Establish virus-free seed production fields to supply seed for large-scale production. For those who propagate and save their own seed, mosaic-diseased plants must be removed promptly whenever found in the seed field during the growing season to reduce transmission. Control insects and prevent disease in a timely manner to ensure that seedlings are virus-free. After viral disease is found, pesticides such as Bingdu Bik e and Bingdu A can be selected for control.
[Precautions] The main disease of Pseudostellaria heterophylla is viral disease, and affected plants should be removed promptly once found. After May, black spot disease and powdery mildew may also occur, and should be controlled with 50% mancozeb 500-fold solution and 15% triadimefon 1000-fold solution. Pseudostellaria heterophylla prefers moist plots; when drought occurs, it must be watered immediately, and during rainy and waterlogged weather, drainage must also be carried out promptly, otherwise root rot will occur and affect yield.
Pseudostellaria heterophylla leaf spot disease
[Damage characteristics] Leaf spot disease occurs mostly in the rainy seasons of spring and summer. Brown round or irregular spots often appear on the leaf surface of diseased plants. In severe cases, it can cause brown blighting and death of leaves, resulting in smaller roots and reduced yield.
[Control methods] (1) Remove diseased plant residues and fallen leaves to reduce overwintering inoculum sources. (2) In the early stage of the disease, spray with Baolian (polyoxin) 1000-fold solution for control; in the middle and late stages, 70% mancozeb 800-fold solution can be used for control. Each time the pesticide is applied, appropriately add foliar fertilizer, yield-increasing bacteria, Handilong, etc., to enhance disease resistance and drought resistance and increase yield.
Pseudostellaria heterophylla root rot
[Damage characteristics] When root rot occurs, the fibrous roots first turn brown and rot, and then the entire root rots. It is prone to occur in the high-temperature and high-humidity season of July and August; pay special attention to promptly dredging ditches and draining water after rain.
[Control methods] (1) After harvest, thoroughly clean up dead branches and residues and burn them in a centralized manner. (2) Implement crop rotation; continuous cropping should not be practiced. (3) In the early stage of the disease, 50% carbendazim, 70% thiophanate-methyl, 75% chlorothalonil or 25% metalaxyl 1000-fold solution can be selected to drench diseased plants.
Pseudostellaria heterophylla insect pests
[Main types] White grubs, cutworms, mole crickets, wireworms, etc. can all damage the growth and development of seedlings and roots of Pseudostellaria heterophylla and should be captured and killed promptly.
[Control methods] (1) Apply fully decomposed manure and use high-temperature composting. (2) Use light traps to kill adults. (3) Spray 0.1% chlorpyrifos or use Dichongle 500-fold solution for root drenching.