High temperature suffocating shed refers to taking closed measures in the shed to use the radiation of solar energy, so that 42~45 °C high temperature appears in the greenhouse to prevent downy mildew. In addition to killing pathogens such as downy mildew, high temperature shacks can also kill some flies, locusts, mites, etc. that are in the shed, and inhibit the reproduction of their offspring.

First, the specific practice of high temperature shack

The water must be poured once a day before the shack, and the ground temperature should be properly raised, which is beneficial to the melon to endure the high temperature and reduce the damage of the high temperature to the melon. The shack must be chosen on a sunny day. After the scorpion is unsealed, the shed will not be allowed to ventilate, because if the wind is drained, it will cause the upper leaves and growth points to be burnt by the high temperature. Before suffocating the shed, first place a thermometer on the height of the growth point of the melon in the middle of the shed, and hang a thermometer on the front, middle and back. Use a plastic plate or cardboard to shield the thermometer from the south side of the thermometer. The alcohol ball of the thermometer is designed to accurately display the temperature inside the shed. At 9 to 10 o'clock, the temperature in the shed will rise sharply. After that, the temperature will be observed in the shed every 15 to 20 minutes. When the temperature rises to 43 °C, the timing will start. The temperature in the shed will not be lower than 42 °C for 1.5 to 2 hours. , the maximum does not exceed 45 ° C. The effect of low temperature is not obvious, and it is high that the autumn of the melon is burned. Pay attention to the performance of the melon, when the temperature in the shed rises to 44 ~ 45 ° C, 3 to 4 leaves below the growth point should be rolled up, the growth point is inclined to one side, which means that everything is normal, can continue.

If the temperature is still not higher than 43 °C near noon, a little firewood can be placed on the sidewalk to ignite into an open flame to warm up, but it must be guarded to prevent fire. When the temperature exceeds 45 °C, the time of the shack has not arrived. Please note that the vents should not be ventilated to cool down. Because the high temperature is released at the same time, a large amount of humid air should be discharged, so that it is necessary to burn the melon when continuing to swell. At this time, you can only put down a few dice to shading to safely cool down. After the stagnation time is reached, it is necessary to slowly increase the venting opening from the top of the shed to slowly lower the temperature of the shed. On the 5th day, some serious diseased leaves can be removed and re-irrigated once. Each ditch can be used with 50 g of urea or ammonium nitrate to promote the recovery of the melons as soon as possible. Because the high temperature shack can only kill some germs scattered on the melon leaves, and some of the bacteria that have invaded are still alive, new bacteria can still be produced, and the bacteria that re-enter the shed from the vents can continue to invade. Dyed onset. Therefore, in the large occurrence period of downy mildew, 4 to 5 days after the first suffocation, it is necessary to perform another suffocating shed for the purpose of effectively controlling the development of downy mildew.

Second, the diagnosis and treatment of high temperature shack

Diagnosis can be judged from lesions and mildew. The lesions were yellow and dry, the edges were neat, the surrounding area was bright green, and the mildew on the back of the lesions was dry or disappeared, indicating that the effect was good and the condition was controlled. However, if there are irregular water-stained yellow-green spots around the lesions, the mildew on the back of the leaves is grayish-black, indicating that the effect is not good and the condition is still developing. The cause should be found and other measures should be taken quickly to control the development of the disease.

Third, the precautions in the shack

1. The high temperature shack is suitable for greenhouses where the melon grows vigorously and has a slight trend. In the early stage, the seedlings are weak, and the late melons are senescent. The mid-growth leaves are thin, pale, and thin, and should be used with caution or not.

2, even after a cloudy day, it is sunny, it is the disease is heavy, the ground temperature is low, the melon is in a state of starvation and water shortage. At this time, it is absolutely impossible to carry out the high temperature shack, otherwise there is the danger of burning or burning all the melons and destroying the shed.

3, must be filled in the first day of the shack, can not release the wind that morning, the first day after the shed, the water will be poured once in time to ensure the rapid recovery of the melon.

4, can spray 1 bactericidal drug before the suffocating shed, the resistance of the bacteria is low at high temperature, and the sterilization effect of the drug is good.

5. When you are shackled, you must always go to the shed to observe the performance of the melon. If the temperature rises above 43 °C, the leaves of the upper part of the melon will not shrink or the small leaves of the growing point will shrink, indicating that the soil is dehydrated or the air is too dry, or the ground temperature is low, and the water is difficult to be absorbed, indicating that the melon is not suitable for high temperature. At this time, the temperature should be stopped immediately, and the vents should be slowly opened from the top of the shed to end the suffocating shed, which can be changed to the drug fumigation method.

6, high temperature shacks have a good effect on the control of downy mildew, but after a few days of boring on the cucumber yield has a certain impact, so can not be used repeatedly several times to prevent the impact of production.

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