In the Tianma area of ​​Datian Township, Shouguang City, the arched shed melon has entered the late stage of swelling. Recently, many melon farmers have called in to report that melons have been seriously affected. I would like to see reporters in the shed. Manager Liu of Xigui Village Agribusiness Store in Datian Town also reported to reporters that with Tianma as the center, the bacterial keratoses of the surrounding melon culms were serious and the incidence rate could reach about half. At about 8:00 AM on May 7, when the temperature outside the shed was about 18°C, the reporter walked with Liu Shi, who was in Nanxia Village, Datian Town, Shouguang City, into his melon shed. The internal temperature has reached 33 °C. Look at the melon surface and leaves, evenly covered with a layer of water droplets, open the tuyere, the surface of the water droplets began to run down. Look at the back of the blade, even if it flows out of liquid like milk, Master Liu used a few drugs, the effect has not been obvious, the condition is still developing. According to the diagnosis, this is melon bacterial angular spot. The disease harms the leaves more, but it also harms stems and fruits. The initial lesions showed oily dots, which gradually expanded afterwards and were limited by veins to be polygonal or irregular, similar to downy mildew. When the humidity is high, a milky pus is generated around the leaf lesions, which is what the former farmer described as milk-like liquid. Because the early symptoms of melon's bacterial keratoses were easily confused with downy mildew, many melon farmers missed the best prevention and treatment period because of misjudgment. According to Liu, manager of the agricultural shop in Nanxia Village, Datian Town, melon bacterial soft rot disease is also an important disease that damages melons and occurs more seriously. Bacterial diseases are frequent and have a close relationship with the current shed management of melon farmers. In response to misunderstandings in melon peasant agricultural operations, the reporter suggests that it can be prevented from the following aspects. The first is to strengthen ventilation and fight it properly. It is recommended that the melon farmers select clear weather for pruning, and pay attention to timely ventilation, reduce the humidity inside the greenhouse, and avoid dew on the stem surface, which is not conducive to wound healing, but is conducive to bacterial infection. The second is spray prevention in advance. After the pruning, many melon farmers do not have the habit of spraying and preventing diseases. This practice is very bad. Because of the high humidity and condensation in the night shed, the probability of complete infection from pathogenic bacteria is still higher in the presence of water droplets and incomplete wound healing. Therefore, it is recommended that melon farmers spray 3000 times agricultural streptomycin immediately after the pruning. The third is to check in time to grasp the best period of prevention and treatment. The prevention and treatment of diseases should highlight an early word. If abnormal symptoms are found in the daily management of the plant, it is necessary to correctly judge the symptoms according to the symptoms, and then select effective drugs for prevention and treatment. For bacterial diseases, 30% boricin can be used 1000 times or agro streptomycin 3000 times, and 33.5% quinoline copper 750 times can be added for foliar spray. In severe cases, it can be sprayed once every 5 days and sprayed 2-3 times in succession. At the same time, attention should be paid to the alternate use of multiple agents to delay drug resistance.
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Fluorochemicals
Organic Fluorochemical Compound,FluorineCompounds,Containing Benzoic Acids
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