Cucumber downy mildew prevention and error
Downy mildew is one of the major diseases on cucumbers, but some vegetable farmers do not know enough about cucumber downy mildew, and often cause serious reduction in production. To prevent cucumber downy mildew, we must avoid going into two major misunderstandings. Misunderstanding 1: Careful attention to the management of contempt of cucumber The downy mildew of cucumber is fastest at 20-25 °C and 85% relative humidity. In the management process, strict control of temperature and humidity is very important for the prevention and control of downy mildew. Some farmers vacate water according to their own schedule, which is more arbitrary. Reasonable watering time should be selected before sunrise in the sunny morning to avoid lowering the temperature. After watering, raise the temperature of the shed to 35°C at noon and maintain ventilation for 50 minutes to quickly reduce the humidity in the shed. When plants absorb nitrogen more often, they are vulnerable to downy mildew. In the early stage of cucumber growth, appropriate measures such as temperature control and water control are used to plant seedlings and enhance plant resistance. Misunderstanding 2: The use of no-primary and secondary leaves of the plant to pick up a few brucella spots, then they were used to "blown" them. The spraying of highly effective therapeutic drugs after the occurrence of diseases can achieve a good control effect, but it will also make the bacteria resistant in a short period of time, laying a hidden danger for the next round of infection. The use of drugs to prevent downy mildew can be divided into 3 stages. Before the occurrence of the disease, sprays of protective agents such as chlorothalonil, thiophanate-methyl, oxazolyl-sensenol, etc. can be used. At the beginning of the disease, protection and therapeutic agents such as urea manganese zinc and metalaxyl manganese zinc can be used. In the severe stage of disease, 10% suspension of cyclosulfazide (500-fold solution) and 69% of zinc dimethoate wettable powder (500-fold solution) can be mixed and sprayed to improve the control effect. Before treatment, it is necessary to distinguish between the central disease strains that infect downy mildew and the primary infection source, and carry out key prevention and control. This is not only solved by blind spraying. The sheds in the front of the greenhouse are seriously dripping and have high humidity. Generally, they are the “hard-hit areas†for downy mildew. In addition to the timely spraying of pesticides, the plants can also be used to administer roots from the roots by means of systemic medicaments to prevent the humidity in the greenhouses. Too large, such as 80% triethylphosphonate wettable powder 500 times Irrigation roots, per bottle irrigation 150 ml liquid, can play a better control effect. When the cucumber downy mildew and other diseases such as anthrax, bacterial angular leaf spot, bacterial leaf blight and other mixed hair, the prevention and treatment process should pay attention to distinguish the key, not a variety of diseases together medication, otherwise it will not only not achieve good The effect of prevention and control will also cause phytotoxicity which is not worth the candle. When a variety of diseases are mixed, priority should be given to the prevention and control of diseases based on weather conditions, temperature and humidity in the shed, and other environmental conditions. When cucumber mixed with downy mildew and anthrax occurs, it can be used together; if bacterial disease is associated with it, it can be treated with downy mildew and anthrax first, followed by bacterial disease.
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