Master Cai of Wushan County, Gansu Province, said that the whole plant tomato in the greenhouse had been seriously dead recently, and the leaves of the dead plants were still green. What disease is it? The cockroach prevention? According to the author's judgment, this is tomato bacterial wilt, which has been severe in recent years. At the beginning of the disease, the tomato plants wilted at noon, and they could recover in the morning and evening. After two or three days, the whole plant died, but the dead plants were still green. When the diseased stem is dissected, it can be seen that the vascular bundle becomes dark brown, and the pith part becomes brown and rot. The white bacteria viscous liquid overflows by squeezing or cross-cutting the diseased stem into the water cup. Prevention and treatment methods: 1. Pay attention to adjusting the pH value of the soil. For the acid-soiled soil, the quicklime may be appropriately applied, and the pH is not more than 100 kg per mu, and the pH is adjusted. 2. Implement a rotation. It is best to carry out two to three years of crop rotation in crops other than eggplant, potato, pepper, peanut and legumes. 3, select resistant varieties, or take graft cultivation to prevent disease. 4. Cultivate strong seedlings. During the period of vigorous seedling growth, stop cultivating as much as possible to prevent bacterial intrusion caused by cultivating roots. The fertilization of tomato should be rationally combined with NPK. It can also spray 10 mg/L of boric acid at the seedling stage to promote the growth of vascular bundles and improve the disease resistance of plants. 5. In the early stage of the field, the diseased plants should be removed in time, brought to the field for destruction, and sprayed. Can choose 14% lycopene copper water 300 times, 77% can kill wettable powder 400 ~ 500 times, 50% succinic acid copper (DTM) wettable powder 400 times, 60% succinyl aluminum WP 600 times irrigation roots, 300-400 ml per plant, spray can also be used, every 7 to 10 days, continuous spraying 2 to 3 times. Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Virus Specimen Collection Tube Features
Used for the collection and transportation of clinical influenza, avian influenza, hand-foot-mouth disease, measles and other virus specimens, as well as mycoplasma, ureaplasma, chlamydia and other specimens.
Mixed sample tubes hold more swab heads, so the retention fluid capacity is often larger. For example, single swab retention solution is generally 3ml, 10 and 1 sample tube retention solution is generally 6ml, 20 and 1 retention solution is 10-12ml. The same amount of viral nucleic acid (e.g. 300copies) is stored in 3ml, 6ml, and 12ml copies in concentrations of 100copies/ml, 50copies/ml, and 25copies/ml respectively. Obviously, the greater the number of mixed tests, the lower the virus concentration, the higher the detection sensitivity will be required. Transfer Media Kit Collection Tube,Disposable Vtm Virus Tube,10Ml Virus Sampling Tube,Disposable Specimen Collection Tube Changchun ZYF science and technology CO.,LTD , https://www.zyf-medical.com
1. Medical grade polypropylene material, high transparency, high sealing and low temperature resistance;
2. With 6ml&10ml two specifications, the cone bottom can stand;
3. The thread structure design of the pipe cover ensures high sealing performance; the pipe cover has no O-ring external rotation design to reduce sample contamination caused by operation and storage;
4. It can cooperate with the sampling swab to perform the functions of collecting and transporting multiple types of samples such as viruses and microorganisms.
Applications
The more the number of mixed tests is, the contact surface between the swab head, the preservation solution and the tube wall will be doubled, which will lead to the increased probability of viral nucleic acid adsorption on other swab heads or tube wall. These factors all lead to higher requirements for system sensitivity.