Downy mildew is an important disease commonly occurring in cucumbers. It is especially prone to occur under the conditions of high humidity in the shelter of the greenhouse. If the disease is not effective, the disease can be reduced by 10% to 30%, and the weight is reduced by 50%. Above, the masses called the disease "running horses."
The temperature change management adopts dual control of temperature and humidity in the morning, and the grasshopper is opened after sunrise in the morning, and the room temperature is quickly raised to above 28 °C to avoid the onset period. In the afternoon, the humidity is controlled by a single unit, the humidity is about 60%, and the temperature is 20 ° C to 25 ° C. The humidity is single control in the middle of the night, the humidity is lower than 85%, and the temperature is 15 °C ~ 20 °C. Temperature control in the middle of the night, the maximum humidity does not exceed 85%, but the temperature should be reduced to 13 ° C ~ 15 ° C below, the same can avoid the disease.
Appropriate air release In the temperature change management, the air release time should be determined according to the temperature change. When the room temperature reaches 30 °C in the morning, the air will start to bleed. If the room temperature continues to rise, it is necessary to increase the air release. A large amount of dehumidification, within 2 hours of sunset, if the humidity in the shed reaches about 90%, the night wind should be placed immediately. The length of the blasting time is determined by the change of night temperature. The minimum temperature at night is 10 °C for 1 hour, 11 °C for 2 hours, 12 °C for 3 hours, and 13 °C for all night. When the minimum outside temperature is stable at around 10 °C, special attention should be paid to controlling the night temperature. The method of closing the shed can be adopted. When the temperature in the shed falls below 20 °C, the shed will be closed.
Supplemental nutrition Foliar application can deepen the leaf color, increase the leaf thickness, and increase the plant resistance. At 9 o'clock in the morning, it is the closed stage of the greenhouse. CO2 gas fertilizer can be applied indoors to enhance the photosynthesis of the leaves, improve the room temperature and reduce the damage of downy mildew. Because the liquid nitrogen content in the plant is easy to be affected, spraying the urine on the foliar (1:1:200) can significantly improve the physiological resistance of the leaves.
The high temperature shack uses high temperature to suppress the occurrence of diseases. The method is to close the greenhouse in the morning on sunny days, and raise the temperature of the shed to 45 °C for 2 hours, which can effectively control the spread of the disease and kill the bacteria. However, the maximum temperature of the shed should not exceed 47 ° C, and water must be watered one day before the temperature of the closed shed, and the thermometer should be hung at the same height as the cucumber growth point (faucet). After the high temperature in the shed for 2 hours, the temperature of the shed was gradually restored to normal temperature.
Grafted seedlings grafted seedlings have developed roots and strong growth. Under the same conditions, the grafted cucumber disease is light and occurs late.
Careful observation should be carefully observed indoors from inside to outside every morning, pay attention to both sides of the leaf, and find that the diseased leaves are immediately taken out to the outside, and take the key prevention and control, and strive to eliminate the disease in the bud. (Fan Jialin)
Henan Daily Rural Edition
The temperature change management adopts dual control of temperature and humidity in the morning, and the grasshopper is opened after sunrise in the morning, and the room temperature is quickly raised to above 28 °C to avoid the onset period. In the afternoon, the humidity is controlled by a single unit, the humidity is about 60%, and the temperature is 20 ° C to 25 ° C. The humidity is single control in the middle of the night, the humidity is lower than 85%, and the temperature is 15 °C ~ 20 °C. Temperature control in the middle of the night, the maximum humidity does not exceed 85%, but the temperature should be reduced to 13 ° C ~ 15 ° C below, the same can avoid the disease.
Appropriate air release In the temperature change management, the air release time should be determined according to the temperature change. When the room temperature reaches 30 °C in the morning, the air will start to bleed. If the room temperature continues to rise, it is necessary to increase the air release. A large amount of dehumidification, within 2 hours of sunset, if the humidity in the shed reaches about 90%, the night wind should be placed immediately. The length of the blasting time is determined by the change of night temperature. The minimum temperature at night is 10 °C for 1 hour, 11 °C for 2 hours, 12 °C for 3 hours, and 13 °C for all night. When the minimum outside temperature is stable at around 10 °C, special attention should be paid to controlling the night temperature. The method of closing the shed can be adopted. When the temperature in the shed falls below 20 °C, the shed will be closed.
Supplemental nutrition Foliar application can deepen the leaf color, increase the leaf thickness, and increase the plant resistance. At 9 o'clock in the morning, it is the closed stage of the greenhouse. CO2 gas fertilizer can be applied indoors to enhance the photosynthesis of the leaves, improve the room temperature and reduce the damage of downy mildew. Because the liquid nitrogen content in the plant is easy to be affected, spraying the urine on the foliar (1:1:200) can significantly improve the physiological resistance of the leaves.
The high temperature shack uses high temperature to suppress the occurrence of diseases. The method is to close the greenhouse in the morning on sunny days, and raise the temperature of the shed to 45 °C for 2 hours, which can effectively control the spread of the disease and kill the bacteria. However, the maximum temperature of the shed should not exceed 47 ° C, and water must be watered one day before the temperature of the closed shed, and the thermometer should be hung at the same height as the cucumber growth point (faucet). After the high temperature in the shed for 2 hours, the temperature of the shed was gradually restored to normal temperature.
Grafted seedlings grafted seedlings have developed roots and strong growth. Under the same conditions, the grafted cucumber disease is light and occurs late.
Careful observation should be carefully observed indoors from inside to outside every morning, pay attention to both sides of the leaf, and find that the diseased leaves are immediately taken out to the outside, and take the key prevention and control, and strive to eliminate the disease in the bud. (Fan Jialin)
Henan Daily Rural Edition
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