moncler outlet Cucumber downy mildew suitable mete

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Cucumber downy mildew suitable meteorological conditions occur and control

2, the characteristics of downy mildew is caused by the Cuban leave the fungal disease downy mildew. Every year, cucumber downy mildew,[link widoczny dla zalogowanych], it disease quickly spread fast, heavy damage, the general incidence of the year can make cucumber cut 10% to 20%, 50% popular year to 70%, severe yellowing of the year led to cucumber plants withered crops . Downy mildew in cucumber seedling and adult stage can occur, the main body of the incidence in the leaves of cucumber plants. Suitable weather conditions, the bacteria can within the sporangium germination in 1.5h, 2h after the invasion of leaf surface to the formation of lesions. More appropriate for weather conditions, the bacteria can invade the leaf stomata, from the onset to spread as long as 5 to 7 days. When the disease, mostly chlorotic leaf lesions began to appear center, formed to extend around the irregular brown spots,[link widoczny dla zalogowanych], withered leaves gradually turn yellow, when the humidity produced in the dark gray surface of leaf mold layer, commonly known as Incidence of downy mildew suitable temperature range is 15-22oC, 28 �� when the disease is not conducive; air humidity> 85% favor the disease, rainy, foggy, and more exposed, the lack of sunlight during the rainy help disease, can take the wind and rain spread to the surrounding. Biological Control of Downy Mildew 3.1 3 regulate greenhouse temperature and humidity, changes in greenhouse microclimate conditions, can prevent and control the intrusion of cucumber downy mildew, the incidence and spread. Received :2004 -06-18 Meteorology 4, 2004 Lo, high Xueqin, Zhen-liter 463 400; 3. Henan Institute of Meteorological Sciences,[link widoczny dla zalogowanych], Zhengzhou 450003, China), therefore, adjust the temperature and humidity in greenhouse conditions, changes in local micro-climate inside the greenhouse Article ID :1004 -6372 (2004) 04-0031-0207-13, the greenhouse temperature control at 28 32 ��, high temperature and nausea shed inhibition of bacteria, when the temperature> 30 �� when the gradually leaked, so that the indoor humidity drops 6o% ~ 70%, using high-temperature, low humidity double factor inhibiting the germination and invasion of bacteria,[link widoczny dla zalogowanych], and then the greenhouse microclimate conditions isolates of cucumber body is very beneficial for photosynthesis. 13 ~ 18, the greenhouse temperature control at 20-25 ��, humidity control at 60%, although the temperature suitable for downy mildew in greenhouse germination and invasion, but the low humidity can inhibit the bacteria, but also help the body to carry out photosynthesis in cucumber plants. Greenhouse temperature dropped to 20 ��, time off to put the greenhouse temperature and indoor humidity will therefore gradually increased, to open the greenhouse vents air at lower humidity behind in order to prevent water droplets or water film on leaves prevail, then closed greenhouse. 18 ~ 00, the first use of humidity control bacteria, when the humidity rises to 80% ~ 9o%, the temperature should be controlled at l3 a l5 ��, with a low temperature inhibition of bacteria. 00 ~ 07, the temperature control at 12 ~ 13 ��, using low-temperature inhibition of bacteria. Lowest at night when the outside temperature 10 ��, ventilation 1h, after the outside temperature is increased by 1oC, extending ventilation 1h, reached 13 �� night when ventilation. Control of microclimate conditions at night, is conducive to the transport of photosynthetic products to reduce the consumption of respiration, the accumulation of nutrients and promote plant growth and fruit body. When the cucumber downy mildew serious pesticide control fails, the greenhouse temperature raised to 44 ~ 46 ��, stuffy studio 2h, except downy mildew can kill, and then gradually increase the leaked ports, returned to normal room temperature. Stuffy studio is the key to high-temperature strictly controlled temperature and time, can not burn plants and pouring enough water in the first day, so the greenhouse humidity is strengthen field management. 3.2 Chemical Control of cucumber downy mildew onset, it is necessary and timely removal of diseased leaves, get rid of sick plants to dry out outdoor burning, source reduction, and immediately surrounding the chemical control. Note watch the weather forecast, depending on the weather situation, the continuous rain, fog, and more intrusive for downy mildew, the incidence and spread of the weather conditions, timely application of effective chemical agents, preventive and control.4 Conclusion In order to prevent or mitigate the harm of cucumber downy mildew, in addition to timely and scientific control, but also a strong ability to select disease-resistant varieties, such as Jinyou II, III, etc. Jinchun to improve resistance to downy mildew ; the same time, to change the traditional farming methods, will be built in the high altitude greenhouse selection, easy drainage, lighting and a good location, using Takakuro planting, mulching, film Dark irrigation, drip irrigation, surface irrigation abolition of the traditional way; Furthermore, it should strengthen field management and nurturing seedlings, rational fertilization, and promote plant vegetative and reproductive growth of co-ordination and enhance plant disease resistance. * 31 *
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