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1. Downy mildew. Cucumber can be infected during the whole growth period and it mainly damages the leaves. Due to the limitation of the lesions by the veins, they often appear as polygonal brown or yellow-brown patches, making them very easy to diagnose.
The pathogens mainly winter in greenhouse crops in winter and can occur in the protected areas for an anniversary. The suitable temperature for onset is 15°C～22°C, and the relative humidity is higher than 83%. When the leaves have water droplets, it is easy to develop.
Control methods: In addition to the selection of disease-resistant varieties, the pastoral cleanliness, rational dense planting, high-ridge cultivation, and humidity control should be maintained. Under the film dark irrigation or drip irrigation, water-saving insulation, in order to help reduce the humidity inside the greenhouse. As soon as possible in the early morning to ventilate moisture, pay attention to the balanced application of nitrogen, phosphorus and potassium fertilizers. Chemical control can be used to prevent disease prevention and control "fool prescription." Prevention can be used 70% of Dakkoning 600 times wettable powder, 25% Amistar suspension 1500 times, 80% of large wettable powder 500 times, 56% acetochlor chlorothalonil 800 times and other spray. Immediately after the discovery of the central disease strain, a full-scale spraying was performed and the diseased leaves were promptly removed and burned out of the shed. Treatment can be selected 68% Jinlei water dispersible granules 500 to 600 times, 40% Ferguson suspension 500 times, 25% Ruifan suspension 1500 times, 68.75% silver hair suspension 800 times, 72% grams 600 times anti-lingual liquid, 64% vanadium WP 500 times, 69% Anke wettable powder 600 times, 72.2% Prokary water 800 times liquid spray control. A simultaneous addition of 25% amidica suspension can also be added to 68% Jinlei water dispersible granules for simultaneous prevention and treatment.
2. Powdery mildew. The disease is also one of the diseases that cucumbers are easy to obtain in the autumn season and can be susceptible to disease in the whole growing period. The main infection leaves. At the beginning of the disease, sparse white mold layer grows on the leaf surface, and the thick layer of the mold grows gradually to form a dense white round spot. Severe disease when infected with stems, stem vines, yellow leaves after the onset of necrosis.
The powdery mildew bacteria overwinters in the soil with the diseased debris in the closed cyst shell, and can also overwinter on greenhouse vegetables. Spread by air currents, rain, and watering, the warm, humid, rainy, and densely populated environment is susceptible to epidemics, flooding, flooding, high humidity, and lack of fertility.
Control methods: Appropriate application of biological bacterial fertilizer, phosphorus and potassium fertilizer, strengthen field management, reduce humidity, enhance ventilation and light transmission. Chemical control can take 25% of Ami-Site suspension 1500 times, 75% of Dakkon wettable powder 600 times, 10% of World High water dispersible granules 2500-3000 times, 32.5% of Difenoconazole Emulsion suspension agent 1500 times, 80% WP 600 times, 43% baclofen suspension 3000 times, 2% ADD water 400 times liquid, 40% Fuxing EC 4000 times spray.
Overwintering and picking cucumbers to prevent "two diseases" after colonization
In late autumn, winter cucumbers are planted in the sheds. The temperature difference between late autumn and late night is relatively large, and the dew is heavy. With the declining temperature, the shed film is released during the day to cool and cool, and the sealing insulation needs to be closed at night. This growth environment is very suitable for the occurrence of downy mildew and powdery mildew, and farmers should pay attention to prevention and control.