Cucumber downy mildew prevention
Cucumber downy mildew has the fastest incidence at 20°C-25°C and 85% relative humidity. Cucumber downy mildew mainly damages the leaves, and it can develop in the whole growth period of cucumbers, especially after the cucumbers have blossomed and squashed. Here, we remind farmers to strengthen the control of cucumber downy mildew. The method is as follows:
1. In the early stage, watering should be properly controlled and intensive cultivation should be strengthened. Care should be taken to prevent waterlogging in the fields after fruiting and avoid flooding. In the management process, strict control of temperature and humidity is very important for the prevention and control of downy mildew. The watering time should be selected in the morning of sunny days and watered before sunrise to avoid the decrease of the ground temperature and the temperature management after watering.
2. Protecting the cultivation of greenhouses, greenhouses, etc. should pay attention to ventilation and light, cooling and humidity; deep land, full base fertilizer, increased phosphorus and potassium fertilizer. In the late growth stage, the growth of the plants was significantly weakened, and the nitrogen sugar content in the plants was reduced. In this case, downy mildew was most likely to occur, and the nitrogen sugar liquid could be sprayed on the leaves to supplement the nutrients. The nitrogen sugar solution can be prepared with white sugar, urea and water in a ratio of 1:0.5:l00, sprayed once every 5 days, and sprayed 5 times; clean the garden, completely remove the field sickness and burn after harvest, during the growing season If you find a diseased leaf, remove it immediately and focus on it.
3. Spray control. Before the occurrence of the disease, protective agents such as chlorothalonil, thiophanate-methyl, etc. can be selected. In the early stage of the disease, protective and therapeutic agents can be selected, such as 72% of cymoxanil zinc, 64% Metalaxyl manganese zinc spray. Severe disease occurs, you can choose to mix two agents, can enhance the control effect. In particular, when cucumber downy mildew and other diseases such as anthrax or bacterial angular spot, bacterial leaf blight, etc. mixed, the prevention and treatment process should pay attention to distinguish, not a variety of diseases together medication. On the contrary, not only does it fail to produce good results, but it also causes damage to the invisible leaves. When multiple diseases occur mixed, the main diseases should be selected for priority prevention and control according to the weather, temperature and humidity in the shed. The commonly used agents are 69% ank manganese zinc 1000 times, 72% gel 600 times, 72.2% prick 600 times, 25% thiram 800 times, 80% aluminum phosphate 500 times, 70 % Mancozeb 500 times and so on.
4. Pay attention to the plants located in the front part of the greenhouse. Because the front part is seriously dripping and has high humidity, it is generally a severely affected area for downy mildew. For these plants, it is necessary to spray pesticides in time. Second, it can be used to administer the use of systemic drugs. Root method, from the root of medication, up and down the conduction of treatment, such as 80% of aluminum phosphate aluminum wettable powder 500 times IRRIGATING, each plant irrigation 150 grams of liquid, can play a better control effect.
5. Smoke prevention and control. Smoke is also an effective method to prevent downy mildew. After protecting cucumbers in the ground, the plants are tall and the spraying is more laborious. Especially in the rainy days, downy mildew has already occurred. Spray control will increase the air humidity in the protected area. Less effective. It is a simple and effective method to control cucumber downy mildew with chlorothalonil. Under normal circumstances, when a diseased plant was found in the greenhouse, use 45% chlorothalonil smoke agent, 200-250 grams per acre of greenhouse medication, divided into 5, evenly distributed to 5, with the dark fire lit from the inside out , Close the doors and windows. It is advisable to administer the medicine in the evening and the next morning, it should be smoked every 7-10 days. This method is effective not only for downy mildew but also powdery mildew and gray mold.
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