Wearing hat seedlings: After the symptoms of the seedlings unearthed, the mid-leaf caught the embryo leaves do not fall off, resulting in the embryo leaves is difficult to open, photosynthesis is affected, poor growth and development of weak seedlings. Prevention and control measures: First, apply organic fertilizer and pouring foot-bottom water, cover soil properly after sowing; Second, timely cover insulation film and straw curtain.
Root shoots: The symptoms are that the roots do not grow or few new roots or adventitious roots are found. The root bark becomes brown and gradually rots, causing the plants to turn yellow and wilting. Control measures: First, maintain proper temperature, select breathable land as seedbed, increase ground temperature; maintain seedbed temperature, daytime 20°C-25°C, nighttime 15°C or more. The second is to reduce the humidity inside the shed and do it in the seedbed. The third is to pay attention to increased lighting, to choose a place with adequate light to build a seedbed. The fourth is to give enough farmyard fertilizer to cultivate fertility and cultivate strong seedlings. It can also increase ground temperature and reduce disease occurrence.
Actually seedlings: The symptoms are fine stems, long internodes, thin leaves, and pale color, mainly caused by high temperature and high humidity. Control methods: First, according to the requirements of temperature and humidity seedlings, timely ventilation, especially at night, the temperature should be appropriately lower; Second, we must ensure that the transparent cover clean, try to increase the light intensity and light time; third is to prevent seedlings are too crowded To ensure adequate supply of nutrients for seedlings.
Aging seedlings: The symptoms are small seedlings, short stems, and the roots are not easy to regenerate new roots, and the leaves are small and thick. The cause is seedling age or seedling time is too long. Preventive measures: In the management of nursery, we must strictly control the seedling age, and the seedlings should preferably adopt the method of controlling the temperature without controlling the water.
Throat Swab refers to a sterilized medical long cotton Swab, dipped in a small amount of secretions from the throat of the person to be tested, and then tested for the virus in the respiratory tract. The detection method is to instruct the patient to open his mouth and make an "ah" sound to fully expose the pharynx, and then use a long cotton swab to wipe the secretions on the pharyngeal and palatine arches and tonsils on both sides. , and seal it for inspection in time. It is best not to use drugs before the test, so as not to affect the test results, the patient may have throat discomfort during the test, which is mostly tolerated. Clinically, throat swabs can be used to detect respiratory syncytial virus, influenza A and B viruses, and novel coronavirus pneumonia. The method is simple to operate, convenient and fast, and can produce results quickly, thereby guiding clinical diagnosis and treatment.
Anal swabs, disposable sampler swabs, disposable flocking swabs, medical anal swabs
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