Preventing Cucumber Downy Mildew from Avoiding Two Mistakes

Misunderstanding 1: Focus on chemical control, contempt management. From the perspective of the three necessary conditions for the occurrence of the disease (host-plant itself, environmental conditions, pathogens), the three are indispensable, reasonable plant management and the control of environmental conditions such as temperature and humidity are also crucial for the onset. How to strengthen management, improve the resistance of cucumber plants and create an environment suitable for cucumber growth and reduce the risk of downy mildew, must understand the conditions of cucumber downy mildew, cucumber downy mild disease suitable at about 20-25 degrees Celsius, air relative Humidity 85%, the fastest incidence. Therefore, the management of temperature and humidity is very important. In the management process, strict control of temperature and humidity is very important for the prevention and control of downy mildew, such as the choice of watering time, the average farmer according to their own time, taking the time to water, more random, reasonable watering time should be selected Watering in the morning on a sunny day and before sunrise, avoiding a decrease in the ground temperature and temperature management after watering. At noon on the day after watering, the temperature in the shed was raised to 35 degrees Celsius for 50 minutes, and then ventilation was started. The rapid reduction of air humidity in the shed was also conducive to temperature control. As the base fertilizer in the early shed is adequate, when the plants absorb nitrogen more often, it is easy to cause the internal carbon and nitrogen ratio of the plant to be out of balance, and the susceptibility to downy mildew is very vulnerable to downy mildew. Therefore, in the early stage of plant growth, suitable seedlings should be controlled through temperature-control and water-control measures to cultivate strong, prosperous but not overly long plants, so that the leaves will accumulate more nutrients and increase the thickness of the leaves, thereby increasing the resistance of the leaves and plants. Illness. This is why the sugar is added to the control agent. Misunderstanding 2: The use of pharmaceuticals has no choice but to use chaos. This is an error that is easy to make for a shed newcomer. There are a few brucellous spots on the leaves and they are madly bombed with pharmacists. After the occurrence of the disease, it is required to immediately see the effect and directly spray high-efficiency therapeutic agents. Although the immediate effect can be achieved, it will also make the germs resistant in a short time, and it will cause hidden dangers in the next round of infection. The so-called "prevention in advance", the prevention and treatment of diseases is also the reason. When selecting and controlling chemicals, they can be simply divided into three prevention and control phases (disease-free phase, disease-initiation phase, and disease-causing phase), and pesticides can be sprayed with protective agents according to the drug cycle before the disease occurs. In the early stages of disease development, bactericidal agents, thiophanate-methyl, thiophene, etc. can be selected as protective and therapeutic agents, such as 72% cymoxanil zinc manganese and 64% metalaxyl manganese zinc. Severe disease period, you can choose to mix two agents, such as can choose 40% of the Cyazofamid Suspension 500 times +69% of dimethomorph manganese zinc 500 times mixed spraying, will 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. In particular, in recent years, the downy mildew of cucumber in the Shouguang shed is generally mixed with anthrax, so when it comes to prevention and treatment, it can be used together. If it is also doped with bacterial diseases, it can be the first to control downy mildew and anthrax. , After treatment of keratinella and leaves withered." Moreover, medication is often used together, regardless of the primary and secondary. Before treatment, it is necessary to distinguish between the central disease strains that infect downy mildew and the primary infection source of the disease, and carry out key prevention and control. This is not only solved by blind spraying. For example, plants located on the front face, which are severely affected by downy mildew due to severe dripping in the front and high humidity, must be sprayed with medicaments in time for these plants. Second, they can be used to irrigate the roots with a systemic medicament. Methods, from the root of the drug, the upper and lower conduction for treatment, such as 80% of aluminum phosphate aluminum wettable powder 500 times IRRIGATING, each irrigation 3 Potion, can play an excellent control effect.

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