Greenhouse cucumber downy mildew damage peak into

Greenhouse is liangzhou competitive industries, the larger dam, water, distribution, Qingyuan, four dams and other towns of greenhouse winter vegetable crop cucumber cultivation mainly based. Late October, cucumber epidemic, fulminant or severe disease --- cucumber downy mildew began to enter damage peak. In particular, some newly planted greenhouse farmers, because the greenhouse temperature and humidity control measures are not in place, resulting in greenhouse nighttime humidity is too high, leaf dew serious, resulting in the occurrence of cucumber downy mildew. Cucumber disease control for the current existence of the outstanding problems, Agricultural Technology Promotion Center researcher Gan Guofu remind farmers should take pharmaceutical prevention and treatment techniques. Greenhouse cucumber downy mildew has not occurred, should be prepared to pharmaceutical prevention. The specific method is: per spray water (15 kg) was added 70% Antai Sheng WP 1 bag (25 g), 68.75% silver Farley suspending 12.5 ml (a pesticide bottle), spray evenly cucumber leaves back of the front ; spray once every 7 days after 70% of Antai Sheng wettable powder (25 g per spray water treatment), continuous spray 4 to 5 times, can prevent disease, zinc, retaining leaves. Fast development of cucumber downy mildew, once found diseased or ward center, should be promptly remove diseased leaves, and quickly spray 68.75% silver Farley suspending drug treatment. The specific method is: per spray water (15 kg) was added 68.75% silver Farley suspension 25 ml (2 pesticide bottle), 70% Antai Sheng WP 1 bag (25 g), uniform spray cucumber leaves back of the front . After spraying mold layer from the lesion and to judge the effect spraying (rear leaf lesion was brown, neat edge, dry, surrounded by bright green leaf, indicating that prevention works well). If there is mold layer on the surface of leaf lesion, the lesion continued to show a yellow-green surrounding, the lesion is not under control, will continue to disease, visual condition within 5 to 7 days after treatment and then spray the medicine. Control greenhouse humidity. Cucumber downy mildew in high humidity, low temperature, poor ventilation are prone. Average nighttime temperature from 20 ℃ down to 12 ℃, leaf water film maintained for 6 hours to complete germination and bacteria invade, if the leaf surface is no water, what kind of temperatures can not develop the disease, when the relative humidity reaches 83 % or more, that is when the leaves are water film, to disease. A dry pond to reclosable plastic film, plastic film to protect the ditch to increase temperature, reduce soil moisture evaporation, reduce air humidity; two films in the sunny morning shallow irrigation ditch next single, non-rain (snow) days of irrigation and flood strings irrigation, irrigation, after irrigation and remove moisture, to prevent excessive humidity, leaf dew; Third, we must advocate for a short time early in the morning promptly leaked exhaust moisture and humidity in order to facilitate replacement, rapid increase in temperature. Improve spray quality. First, greenhouse Sprayers must be dedicated, especially the best selection of copper nozzle, spray holes to choose the smallest such fine droplet spray nozzle can improve adhesion rate of droplets. Secondly, when the spray pressure should be sufficient, the pressure was fine enough droplets, the droplets can fine droplets evenly distributed in the leaves. In addition, the nozzle to be tilted upward, spray shall be detailed, backs of the leaves, the front should be sprayed.