1. Symptoms of Melon Seedlings Melon Seedlings is a physiological disease that often occurs in the later stages of melon growth, often resulting in a decline in melon production. Melon plants showed weakness when the seedlings collapsed. When the weather was sunny, the light was full, and the temperature was high, the rainstorm suddenly fell. Then the sudden temperature difference at night was extremely unbearable. The collapsed seedlings are prone to occur, and they can recover slowly when they occur. Withered. Disclaimer: Some articles of this website are transferred from the Internet. If the legal rights of third parties are involved, please inform this website for processing. phone
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Such antibiotics first affect the outer membrane of sensitive bacteria. Drug ring part of polypeptide amino and lipopolysaccharide in the outer membrane 2 valence cations combining site to produce electrostatic interaction, destroy the integrity of the outer membrane damage, fatty acid part of drugs to penetrate the outer membrane, thus increase the permeability of cell size, lead to intracytoplasmic phosphate, nucleosides and other small molecules to escape, straight die cause cell dysfunction. Gram-positive bacteria do not respond to such antibiotics because they have a thick cell wall that prevents drugs from entering the bacteria.
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2. The first reason is that the accumulated water in the soil or the humidity is too low, which will hinder the respiration of the root system, leading to the lack of oxygen in the root system. Because of the activity of anaerobic bacteria, a large amount of harmful substances will be produced and the root system will be poisoned. The root system cannot grow normally and lose In order to reduce the transpiration of the leaves and the water supply of the root system, the stems and leaves will weaken and the seedlings will collapse. The second is that the temperature during the hot season is higher during the daytime, the transpiration is strong, or the weather is long and cloudy, the transpiration loss is greater than the water supply of the root system, which will cause the melon seedlings to wither and fall. This phenomenon is more prominent in the later stages of growth, and the regeneration of the root system is weaker in the later stages of growth. Once the damage is recovered slowly or cannot be recovered, the damage will only be greater at this time.
3. Prevention and control method: When it is fine after rain, water it immediately to reduce the ground temperature and ground temperature. After watering, the drain should be opened in time so that the poured water can be quickly discharged again. If the production area is large Or when the water source is not enough, the watering method of separate border or fan can be adopted. After watering, plowing in time to maintain the normal soil temperature can also play a role in prevention and control. In rainy days, drainage should be carried out in time to ensure that no water accumulates in the field. After raining, the soil should be cultivated to loosen the soil and ensure that the root system breathes normally. In addition, before the field operation, wash hands and knives with soapy water to prevent the frictional infection of the juice. Spraying should be started at the early stage of disease and insect pests, about once every 10 days, depending on the disease.