The disease is commonly referred to as "pour seedling", "mold root", "small ankle", which is mainly caused by the infection of the genus Pythium. Some species of Pythium and Phytophthora can also cause disease. The host of the pathogen is very wide, and when it is serious, it can cause a piece of dead seedlings.
Seedling plant diseases caused by fungi such as Pythium, Phytophthora, Rhizoctonia. It can affect the growth of seedlings, causing lack of seedlings or even destroying seeds in severe cases. Different types of fungi cause different symptoms. The base of the stem of Pythium and Phytophthora infested seedlings became soft and watery, causing it to rapidly wilting, and finally the base of the stem was linearly collapsed. Sometimes the cotyledons have not yet manifested symptoms, that is, they have fallen, so the name collapses. It is most common to use melon seedlings. The seedling disease caused by Rhizoctonia is generally called the blight, and the brown spot of the stem of the damaged seedlings gradually shrinks the young stem until the seedlings die, and generally does not fall immediately. Infected cotyledons can also produce brown irregular shaped lesions. The blight of Solanaceae, Cruciferous crops and cotton seedlings is more common.
Control technology:
1. Selection of nursery site: Select the place where the terrain is high, the groundwater level is low, the drainage is good, the water source is convenient, and the shelter from the wind is sunny.
2. Strengthen seedbed management.
3. Chemical control: In the area where the disease is frequent, in the seedbed where the bottom water is used, spray 38% of the curcumin 25ml-50ml per acre, and then sieve a thin layer of dry soil to promote the bud. The seeds are spread on the ground and sieved to cover the soil. Before the onset or at the onset of the disease, spray with 30% of the technical carbaryl water agent 800 times. At the time of onset, the copper ammonium preparation was used 400 times, and the effect was good. The drug control begins when the disease begins, and the interval is 7-10 days. General prevention and treatment l-2 times, and timely removal of diseased plants and adjacent diseased soil. Agent selection: 56% azoxystrobin chlorothalonil 800 times solution, or 70% mancozeb WP 500 times solution, spray 41% polypyridinium pyridoxamine 800-1000 times solution or 30% nail frost 86 times solution of mycelium; or 38% solution of amphotericin agaric acid 800 times solution, or 72% cream urea·manganese zinc wettable powder 600 times solution, or 69% enoylmorphin·manganese zinc wettable powder or Water dispersible granules 800 times solution. In order to reduce the humidity of the seedbed, it should be sprayed in the morning.
Product Name: Methyl carbamide
Main Ingredients: Methylphedrine Content: 25% Metalaxyl Content: 5%
Effective content: 30%
Specifications: 100ml * 40 bottles of 200ml * 30 bottles
Brand certification: Haohao High-Tech Honor
Features:
Methyl acetonide is a systemic high-efficiency fungicide with long-lasting effect. After entering the soil, this product combines with the iron and aluminum ions of the soil to enhance the bactericidal ability. It is absorbed by the soil and absorbed by the roots and can be moved to the leaf edge. And play a role, and the effect is lasting. It has a wide spectrum of sterilization and is widely used. It can control a variety of soil-borne diseases, such as blight, blight, pylori, verticillium, stagnation, sclerotinia, roots and root rot. Control crops such as rice, fruits, vegetables, fruit trees, flowers, lawns and seedlings. Promote growth, strengthen seedlings, strengthen rooting ability, promote plant root and root hair growth, promote crop growth, and improve the yield and quality of agricultural products.
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