Common diseases and control methods of cucumber in cold shed

Downy mildew: it can be sprayed with 800 times of 25% pyrethromycin, once every 7-10 days, for about 3-6 days. Fusarium wilt: 50% thiophanate methyl 400-fold solution, or 50% carbendazim 500-fold solution can be used to irrigate the root. Powdery mildew: 2000 times of DuPont Fuxing can be sprayed. Bacterial angular spot: 47% Jiarenong 600-800 times solution can be sprayed. Blight: it can be sprayed with 800 times of 25% liquids.

Downy mildew

1. In the peak period of plant growth, it is easy to cause downy mildew when the temperature in the greenhouse is too low, too much watering, the field is closed or rainy, the temperature is 15-18 ℃ and the air humidity is more than 80%.

2. At the initial stage of the disease, 64% disinfectant alum 400 times solution or 25% Ruidu 800 times solution or 72.2% Prik 800 times solution can be sprayed every 7-10 days or so for about 3-6 days.

3. If the disease breaks out and can not be controlled, the high temperature greenhouse method can be used in the case of strong plants.

4. Watering is selected on a sunny morning, so as to improve indoor humidity and enhance the high temperature tolerance of the plant. Keep the greenhouse airtight and raise the room temperature to about 45 ℃, starting at 43 ℃. Keep it for 1.5-2 hours and then start to cool down.

5. The greenhouse will affect the growth of plants and young melons, at this time, quick-acting fertilizers or nitrogen solution can be applied to supplement the nutrients needed by the plants, so that they can return to normal growth as soon as possible.

2. Fusarium wilt

The main results are as follows: 1. The conditions that are more prone to diseases are: soil viscous weight, excessive watering, poor drainage and irrigation conditions, more underground pests, more root loss and so on. The disease spreads quickly when the temperature is about 24-30 ℃.

2. At the initial stage of the disease, 50% thiophanate methyl 400 times solution or 50% carbendazim 500 times solution can be used for root irrigation, and each plant can use about 250 grams of medicine solution, once every 10 days, about 2-3 times in a row.

3. The seriously ill plants should be pulled out immediately. In order to prevent the disease from spreading by running water and ploughing, chemicals should be applied in the acupoints of the diseased plants.

4. In order to prevent the pathogen from infecting the plant through the wound, the root system and stem must not be damaged during the pesticide operations such as pruning, ploughing, melon picking and spraying.

Third, powdery mildew

Under the condition of overgrown plants and closed fields, diseases are more likely to occur. At the initial stage of the disease, agricultural resistance can be sprayed with 2000 times of du Pont Fuxing, and it can be sprayed every 7-10 days, about 3-4 times continuously.

4. Bacterial angular spot

Prone to disease conditions: more rainfall, poor ventilation, high humidity in the field and so on. At the initial stage of the disease, you can spray DT fungicide 500x or 47% plus Renong 600,800x, every 5-7 days, about 3-4 times in a row.

5. Epidemic diseases

Prone to disease conditions: high temperature and rain, high humidity in the field, and so on. At the initial stage of the disease, you can spray 25% Trichoderma 800 times or 72.2% Prik 400-600 times, every 5-7 days or so, continuously spraying about 3-4 times.