In addition to killing downy mildew and other pathogens, high-temperature stuffy sheds can also kill some flies, migratory locusts, locusts, etc. that are in the shed, and inhibit the reproduction of their offspring, and they can also control and promote melons. High-temperature stuffy sheds need to be able to appear in the shed 42 °C - 45 °C high temperature, and it is the high yield period of shed cucumbers, can be used to control downy mildew. The specific approach: the day before the boring shed must be filled with water for 1 time, and raising the ground temperature properly will help the melon borer to tolerate high temperatures and reduce the damage caused by high temperatures to the melon borer. Padding must be chosen on sunny days. After uncovering the scorpion, the greenhouse is closed, and the air is not allowed to be discharged. Because if the air is released, the upper leaves and the growing point will be burnt by high temperature. Before the drapery, first put a temperature meter at the height of the growing point of the melon in the middle of the shed, and then put a thermometer on the front, middle, and back, and use a board or cardboard to shave the temperature meter on the south side of the watch to prevent direct sunlight from the thermometer. Alcohol ball. The temperature in the shed will suddenly increase from 9am to 10am. After that, it will enter the observation temperature every 15 minutes - 20 minutes. When the temperature rises to 43 degrees Celsius, it will start the time. It will continue for 1.5 hours - 2 hours. The temperature is not lower than 42°C, and the highest temperature is not more than 45°C. The effect is not obvious when the temperature is low, and the guaran should be burned. Observe the performance of the melon quail. When the air temperature in the shed rises to 44°C--45°C, three pieces below the growth point--four leaves should be rolled upwards, and the growing point is inclined to one side, which means that everything is normal and can continue Bored. If the temperature is still not higher than 43°C in the near noon, a small amount of firewood can be ignited on the sidewalk to warm it up, but it must be guarded to prevent fire. When the temperature exceeds 45°C, the time of drowsy is not reached again. Please note that the ventilation must not be opened to reduce the temperature. Because of the high temperature and air discharge, a large amount of moist air must be discharged. At this time, only a few pieces of curtains can be put down for safe cooling. After the dungeon time is reached, it is necessary to gradually increase the air outlet from the top of the shed and slowly lower the temperature of the shed. On the second day, some severe diseased leaves can be removed and re-irrigated with water once. Each ridge can be topdressed with water to apply 50 g of urea or ammonium nitrate to promote the recovery of quails as soon as possible. Because the high-temperature stuffy shed can only kill some of the bacteria that are scattered on the leaves of the melon, and some of the bacteria that have invaded the leaves still live, new germs can still be produced, and the bacteria that re-enters the shed from the vents can continue to grow. The incidence of infestation. Therefore, in the period of the occurrence of downy mildew, 4 days to 5 days after the first dreary shed, it is necessary to conduct another drowsy shed, so as to effectively control the development of downy mildew. The effect of high temperature stuffy sheds can be judged from lesions and moldy layers. The lesions were yellow withered, with neat edges, and the surrounding healthy leaves were bright green. The back mold layer of the lesions was dry or disappeared, indicating that the effect was good and the condition had been controlled. However, if the spot around the lesion is irregular water-stained yellow-green spots, the moldy layer on the back of the leaf is freshly gray-black, indicating that the effect is not good, the condition is still developing, the cause should be found, and other measures should be taken quickly to control the development of the disease. Pay attention to the following points when boring: First, the high-temperature stuffy shed is suitable for sheds that grow robustly and have a tendency to grow slightly. In the early stage, the seedlings are weak, and the melon shoots are senescent at the later stage. The leaves in the middle growth period are thin, light and thin and should be used with caution or not. The second is the sunny day immediately after a cloudy day. It is the serious disease, low temperature, and hunger and water shortage. At this time, it is absolutely impossible to carry out high-temperature stuffy sheds. Otherwise, there will be danger of burns or burning. . The third is that the day before the boring shed must be filled with water. In the morning, the wind must not be let off. The second day after the boring shed should be filled with water one time in order to ensure that the melon quail quickly recovers. The fourth is to spray a sterilizing drug before the dwelling shed. The bacteria resistance is low at high temperatures and the bactericidal effect of the drug is good. The fifth is when the sheds must be frequently observed in the shed. If the temperature rises above 43°C, the small leaves of the upper leaves of the melon pods do not roll up or grow at the growing point, indicating that the soil is dry or the air is too dry. It may also be that the ground temperature is low and the melon pods are difficult to absorb, indicating that the melon pods are not suitable for high temperatures. , At this time should immediately stop heating, slowly open the vent from the top of the shed to end the boring shed, can be changed to drug smoke control method. Sixth, high-temperature stuffy sheds have a good effect on the control of downy mildew, but after a few days of boring, it has a certain impact on the yield of cucumbers, so it cannot be used repeatedly several times in a row to prevent affecting yield.
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