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[special note] bacteria is a relatively special kind of fungus, called oomycete, considered relatively low-level fungi. The first is that it needs more water. Its spores (a kind of transmission body) depend on the air flow, but the germination and infection all require condensation conditions, usually only 3 hours. Therefore, the humidity in the greenhouse is an important factor affecting the occurrence of the disease. The second is the rapid rate of disease epidemics, which is almost the fastest among the bacteria. Cucumber downy mildew, commonly known as "running horse dry," is a lap of the horse, and the good end of the melon won't dry. This brought difficulties to the prevention and control. After a slight delay, it became a "cannon behind the gun." The third point is that there is a clear difference between the agents that can be used and other fungi. Some fungicides are effective against many fungi but have no effect on oomycetes such as carbendazim, thiophanate-methyl (thiophanate-methyl), thiabendazole, propiconazole, etc., while others are effective against oomycetes The effect of other pathogens is very poor, such as cymoxanil, dimethomorph, metalaxyl, and oxazazone. The last point is that the germs must survive on live cucumbers. In the past, only a few greenhouse cucumbers were used, and the amount of bacteria was limited. Now, in areas where greenhouses, greenhouses and other facilities are developed in agriculture, there are bacterial sources on almost the anniversary of the disease, which brings down the occurrence of downy mildew , The number of drug control should also increase.
[Control technology] The first choice of prevention and control measures is still planting disease-resistant varieties, followed by reasonable cultivation and management, through ventilation, ground film, drip irrigation and other water-saving measures to reduce the humidity within the greenhouse, especially to reduce condensation at night; after the disease can be The implementation of "high temperature stuffy shed", that is watered at 10 o'clock in the morning, no ventilation at noon, so that the temperature inside the shed was maintained at 42 °C ~ 44 °C, 2 hours after the gradual cooling ventilation. Can effectively suppress the disease. Emergency control measures are sprayed with medicines. Because the medicaments mainly play a protective role, they need to be used in advance. Can be 7 ~ 10 days after transplanting seedlings, prevent the first time, after the first time to see the spot after the second prevention, after 7 to 10 days after a control.
The agents that can be used are: Proplocarb (Proclamation), Fluorampethenedan, Cypermethrin (Kelu), Dimethomorph (Anker), Metalaxyl Manganese (10% Metalaxyl, 48%) Mancozeb), Caustic Manganese Zinc (8% Hoacin, 56% Mancozeb), Dimethomorph Morphozide, Triethylphosphonate (Phytophthoraine, Ethylphosphonium), Chlorpyrifos Clear and so on.
Before spraying, we can remove the diseased leaves, especially the old leaves of the lower part. Pay attention to the back of the spray blade. The finer the fog droplets, the better the effect. The liquid per mu can not be less than 60 pounds.
How to prevent cucumber downy mildew
Disease Introduction Cucumber downy mildew is a highly endemic fungal disease that mainly damages the leaves. In the early stage of the disease, water-soaked spots appear on the back of the leaves. The spread of the lesions is limited by the veins and is polygonal and yellow. When the air humidity is high, sparse gray-black mold layer can be produced, which is the transmission body of the bacteria. At the initial stage, the leaves bleed green, the boundary is blurred, and then there are yellow or brown necrotic spots. The diseased leaves conjointly make the diseased leaves wither, and the diseased plants pull out early and the loss is very serious.
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