1 Cultivate strong seedlings 1 Select seeds. Different varieties have great differences in resistance to downy mildew. The varieties that are suitable for local cultivation are: Jinzao No. 3, Jinyan No. 2, No. 3, No. 4, Changchun Mia, Xintai Mia, and Zaofeng.
2 seed treatment. Soaking in warm soup: the water consumption is three times the seed amount, the water temperature is 50-55 ° C, and the temperature is lowered to 25-28 ° C for 15 minutes. Soaking seeds: use 1% potassium permanganate aqueous solution, soak the seeds at 25-28 °C for 30 minutes, remove them, and germination at 25-28 °C.
3 Soil treatment: The seedbed should be selected from disease-free soil, and the base fertilizer should be fully decomposed with farmyard manure. Use 25% carbendazim 1000 times mixed with the soil to “top and coverâ€. Before planting, 1/3 of the soil should be placed on the surface of the watering seedling. After sowing, 2/3 of the soil should be covered on the seed surface.
4 seedling management: more than 60% of the seedlings are unearthed, the film is removed, the temperature of the greenhouse is controlled at 25-28 °C, and the temperature is not lower than 15 °C at night. When the two true leaves are one heart, the daytime temperature is 22-25 °C, and the nighttime is 12-13 °C. It is found that the water shortage of the seedlings should be sprayed on the foliar surface to prevent the filling of the seedbed water. When the temperature is high at noon (above 30 °C), the air is properly ventilated. One week before colonization, the nighttime temperature dropped to 10-11 °C to enhance the resilience of the seedlings. It was found that there was a downy mildew central disease plant at the seedling stage, and it was controlled with 45% chlorothalonil smoked smoke, which not only had high control effect, but also did not increase indoor humidity.
2 Planting and field management 1 Colonization. When the seedling age reaches 45-50 days, 4 leaves and 1 heart are the best period for colonization. Leveling the land, from the north and south ridges, the ridge width is 70-80 cm, the operation trail is 40 cm, the ridge height is 15-20 cm, and the mulch is covered in the middle. Seedlings are planted on both sides of the ditch, water is poured under the middle ditch membrane, and water penetrates into the root of the plant. The purpose is to not increase the indoor humidity and reduce the occurrence of downy mildew, and generally reduce the air humidity by 12%-14%. When planting, it is necessary to fill the water. After that, it will not be watered. When the roots grow to about 10 cm long, the irrigation begins. In the middle and high season, with the appropriate amount of fertilization, 667 square meters of fermented fermented organic fertilizer 750 kg, once every 10-15 days.
2 As the plant grows, the vines, pruning and vines are hanged in time, and the lower leaves and sick leaves are hit, which increases ventilation and light transmission and reduces the incidence.
3 strengthen the ecology. Controlling the temperature and humidity of the greenhouse is suitable for the growth of cucumber and is not conducive to the invasion of bacteria. This is the most fundamental method for controlling cucumber downy mildew. During the growing season of cucumber, the indoor temperature is controlled at 25-28 ° C, the humidity is 65%-75%; the night temperature is 12-13 ° C, and the humidity is 70%-80%. Such temperature and humidity are not conducive to the invasion of the bacteria, but completely It is in line with the ecological conditions of cucumber growth and photosynthesis. After sunrise, make full use of the morning light to close the shed to increase the temperature, increase the temperature by 5-6 °C per hour, and reduce the humidity by 15%-20%. When the outside temperature is stable above 10 °C, it is ventilated day and night to reduce the formation of leaf water film, and the downy mildew occurs lightly.
4 high temperature shack. Choose sunny day at noon, fill the water one day before the shack, and seal the shed on the next day. When the temperature rises to 42-45 °C, keep it for 2 hours, then gradually release the air from small to large, when the temperature drops to 28 °C. Suitable for inhibition of downy mildew.
5 supplement nutrients. The content of nitrogen sugar in cucumber plants is decreased, which is easy to induce downy mildew. Therefore, foliar nitrogen can be used to control downy mildew. Nitrogen sugar ratio: 1 part of sugar, 0.5 part of urea, 100 parts of water, spray once every 4-5 days. It can also spray 0.2% potassium dihydrogen phosphate, 50 kg of 667 square meters of liquid medicine, not only mildew mildew, but also delay plant senescence.
3 Chemical control The occurrence of downy mildew, combined with high-efficiency, low-toxic chemical control, can completely control the occurrence of downy mildew. 72.2% Plex water agent 600-800 times solution; 72% gram dew wet powder 600 times solution; 64% anti-virus 矾 600 times solution; 70% ethyl phosphorus aluminum manganese zinc wettable powder 600-800 times liquid spray, 7-10 days, continuous spraying 2-3 times. In the shed for disease prevention and treatment, the best type of medicine, or aerosol, not only saves labor, saves time, and has high control effect, mainly does not increase indoor humidity.
2 seed treatment. Soaking in warm soup: the water consumption is three times the seed amount, the water temperature is 50-55 ° C, and the temperature is lowered to 25-28 ° C for 15 minutes. Soaking seeds: use 1% potassium permanganate aqueous solution, soak the seeds at 25-28 °C for 30 minutes, remove them, and germination at 25-28 °C.
3 Soil treatment: The seedbed should be selected from disease-free soil, and the base fertilizer should be fully decomposed with farmyard manure. Use 25% carbendazim 1000 times mixed with the soil to “top and coverâ€. Before planting, 1/3 of the soil should be placed on the surface of the watering seedling. After sowing, 2/3 of the soil should be covered on the seed surface.
4 seedling management: more than 60% of the seedlings are unearthed, the film is removed, the temperature of the greenhouse is controlled at 25-28 °C, and the temperature is not lower than 15 °C at night. When the two true leaves are one heart, the daytime temperature is 22-25 °C, and the nighttime is 12-13 °C. It is found that the water shortage of the seedlings should be sprayed on the foliar surface to prevent the filling of the seedbed water. When the temperature is high at noon (above 30 °C), the air is properly ventilated. One week before colonization, the nighttime temperature dropped to 10-11 °C to enhance the resilience of the seedlings. It was found that there was a downy mildew central disease plant at the seedling stage, and it was controlled with 45% chlorothalonil smoked smoke, which not only had high control effect, but also did not increase indoor humidity.
2 Planting and field management 1 Colonization. When the seedling age reaches 45-50 days, 4 leaves and 1 heart are the best period for colonization. Leveling the land, from the north and south ridges, the ridge width is 70-80 cm, the operation trail is 40 cm, the ridge height is 15-20 cm, and the mulch is covered in the middle. Seedlings are planted on both sides of the ditch, water is poured under the middle ditch membrane, and water penetrates into the root of the plant. The purpose is to not increase the indoor humidity and reduce the occurrence of downy mildew, and generally reduce the air humidity by 12%-14%. When planting, it is necessary to fill the water. After that, it will not be watered. When the roots grow to about 10 cm long, the irrigation begins. In the middle and high season, with the appropriate amount of fertilization, 667 square meters of fermented fermented organic fertilizer 750 kg, once every 10-15 days.
2 As the plant grows, the vines, pruning and vines are hanged in time, and the lower leaves and sick leaves are hit, which increases ventilation and light transmission and reduces the incidence.
3 strengthen the ecology. Controlling the temperature and humidity of the greenhouse is suitable for the growth of cucumber and is not conducive to the invasion of bacteria. This is the most fundamental method for controlling cucumber downy mildew. During the growing season of cucumber, the indoor temperature is controlled at 25-28 ° C, the humidity is 65%-75%; the night temperature is 12-13 ° C, and the humidity is 70%-80%. Such temperature and humidity are not conducive to the invasion of the bacteria, but completely It is in line with the ecological conditions of cucumber growth and photosynthesis. After sunrise, make full use of the morning light to close the shed to increase the temperature, increase the temperature by 5-6 °C per hour, and reduce the humidity by 15%-20%. When the outside temperature is stable above 10 °C, it is ventilated day and night to reduce the formation of leaf water film, and the downy mildew occurs lightly.
4 high temperature shack. Choose sunny day at noon, fill the water one day before the shack, and seal the shed on the next day. When the temperature rises to 42-45 °C, keep it for 2 hours, then gradually release the air from small to large, when the temperature drops to 28 °C. Suitable for inhibition of downy mildew.
5 supplement nutrients. The content of nitrogen sugar in cucumber plants is decreased, which is easy to induce downy mildew. Therefore, foliar nitrogen can be used to control downy mildew. Nitrogen sugar ratio: 1 part of sugar, 0.5 part of urea, 100 parts of water, spray once every 4-5 days. It can also spray 0.2% potassium dihydrogen phosphate, 50 kg of 667 square meters of liquid medicine, not only mildew mildew, but also delay plant senescence.
3 Chemical control The occurrence of downy mildew, combined with high-efficiency, low-toxic chemical control, can completely control the occurrence of downy mildew. 72.2% Plex water agent 600-800 times solution; 72% gram dew wet powder 600 times solution; 64% anti-virus 矾 600 times solution; 70% ethyl phosphorus aluminum manganese zinc wettable powder 600-800 times liquid spray, 7-10 days, continuous spraying 2-3 times. In the shed for disease prevention and treatment, the best type of medicine, or aerosol, not only saves labor, saves time, and has high control effect, mainly does not increase indoor humidity.
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