The celery disease is caused by the infection of the genus Pythium. The host of the pathogen is very wide, and when it is serious, it can cause a piece of dead seedlings. Timely pesticide control is necessary.
1. Hazard symptoms:
After the celery is unearthed, the true leaves are not unfolded. The incidence is serious, and the incidence of the seedlings is lighter. When the seedlings are not unearthed, the disease occurs as the embryo stems and cotyledons rot and die. Early onset of seedlings. The base of the stem is water-soaked, and the diseased part becomes yellowish brown, and gradually becomes a thin line. The seedlings die due to the loss of support on the ground, and the leaves remain generally green and not wilting. Under the conditions of high temperature and high humidity, a white, cotton-like hyphae grows on the surface of the diseased plant and on the surface of the pathogen.
2, prevention and treatment methods:
Agricultural control:
(1) When selecting seedlings for seedlings, it is necessary to establish a disease-free plot with high dryness, leeward sunny, difficult to accumulate water, loose soil and fertile soil. It is most likely to be built on low-lying and moist plots, with large plots of land that have not been planted with celery. For the best. The soil fertilizer applied in the seedbed should be fully decomposed to prevent the pathogen from being carried into the nursery bed.
(2) Seed treatment In order to prevent seed-borne bacteria transmission, seeds can be soaked in warm water of 50-55 neonates before sowing. When soaking, keep stirring. When the water temperature drops to 30 °C, soak the seeds and kill the seeds. The germ.
(3) Strengthening the trampoline management The temperature and humidity of the trampoline are important factors in the pathogenesis of the disease, and humidity is the key factor. Reducing the humidity of the seedbed and increasing the temperature are important measures to prevent the occurrence of diseases. Prevent the large water from the bottom of the water before sowing. If the sensation is good, you can properly water the water to soak the 10 cm soil layer. After the sowing, the plastic film is buckled in time, and the leather is covered at night. If the temperature is too low, the grass can be thickened. The grass can also be covered with a plastic film to keep warm and rainproof, so that the temperature is kept at 15 ° C to 20 ° C. To prevent the low temperature in the seedbed from being below 1 sink for a long time. According to the pesticide network , watering should be controlled as much as possible in the trampoline. During the dry season, the water can be scratched at noon on a sunny day, and attention should be paid to ventilation and drainage. During the flood season, attention should also be paid to the time èŒ to enhance ventilation and light transmission. Dry seed ash is often removed from the seedbed, which can reduce the humidity of the seedbed, and absorb heat and warm, and the ash also inhibits the pathogen.
Chemical control:
(1) Before soil disinfection, use 5W6 of Duo Ling Ling WP, spray the aqueous solution of 0.075-0.08 kg per 10 square meters of sputum into the soil, or add 30-40 kg of Domusing WP. Fine soil, mix well and then withdraw into the sputum. Then mix the soil in the sputum. Can be directly sown.
(2) Mix 40% pentachloronitrobenzene with 50% thiram in a ratio of 1:1, apply 0.008 kg per square meter bed and add 10-15 kg of fine soil or fine sand. Can also be in accordance with 0.008 to 0 per square meter. 01 kg of 50% yinling wettable powder is mixed with 5-8 dry grams of finely sifted fine soil. When planting, 1/3 of the soil is laid under the seedbed, and the remaining 2/3 of the soil is used to cover the soil to protect the seeds. This method of covering the lower bunk can greatly reduce the incidence.
(3) After the onset of celery seedlings, the diseased plants should be removed and sprayed. According to the China Pesticide Network , commonly used agents have 75% chlorothalonil WP 700-800 times solution, 40% Ethyl aluminum 50-600 times solution, 72% Plex water 600 times solution, 64% anti-virus 矾The wet powder 500 times liquid spray effect is better.
Stainless steel round steel belongs to a class of long wood, also belongs to a class of bar, the so-called stainless steel round steel refers to the cross section of uniform circular long wood, generally about four meters long. It can be divided into light circles and black rods. The so-called light circle, refers to the smooth surface, after the quasi-rolling treatment; And the so-called black rod, refers to the surface of the black thick, hot rolled directly.
Stainless steel round steel can be divided into hot rolling, forging and cold drawing according to the production process. Hot rolled stainless steel round steel is 5.5-250 mm in size. Among them :5.5-25 mm small stainless steel round steel mostly to straight strips in bundles supply, commonly used for reinforcing bars, bolts and various mechanical parts; Stainless steel round steel greater than 25 mm, mainly used in the manufacture of machine parts or seamless steel pipe billets.
Stainless steel round steel has broad application prospects, and is widely used in hardware kitchenware, shipbuilding, petrochemical, machinery, medicine, food, power, energy, aerospace, building decoration. Seawater equipment, chemical, dye, paper, oxalic acid, fertilizer and other production equipment; Photography, food industry, coastal facilities, ropes, CD rods, bolts, nuts.
316 Stainless Steel Round Rod,316 Stainless Steel Bar,316 Stainless Steel Rod,Ss Stainless Steel Rod
Shandong Xinsuju Steel Co.,Ltd. , https://www.sawlpipe.com