Onion downy mildew is the main disease of onion. It has occurred in the past ten years in seven years. Among them, there are two years of epidemic. In general, the onion can reduce production by 20% to 50%, which has become an important factor restricting the production of onion. Symptoms: Onion and downy mildew mainly damages the leaves. The lesions are pale green and oval in shape at the beginning, and there are obvious expansion ring patterns, leading to dry and dead in later stages. When the humidity is high, the diseased department produces a pale gray black moldy layer, namely the spores and sporangia of the pathogen. The pathogen is the onion downy mildew, which belongs to the flagellin subphylum, the downy mildew, the onion downy mildew. Second, the incidence of law: Onion can be onset in the fall of the seedling stage, the bacteria can be hyphae over the sick plants overwintering, you can also oocyte spores in the soil overwintering. From March to March, with the temperature rising, years ago, the diseased plants began to develop slowly. A large number of pathogens formed on the diseased plants. The overwintering oospores in the soil also began to infect and become the primary infestation source of the disease. Wind, rain, and irrigation spread. In general years, the disease entered the peak period around mid-April, and peaked from late April to early May. With the further rise of temperature after mid-May, the disease was suppressed and the development basically stopped. The prevalence of the disease is closely related to temperature and humidity. Both are indispensable. Generally, the daily average temperature is below 15°C, or the daily minimum temperature is below 10°C. Downy mildew is not prevalent, and the daily average temperature exceeds 19°C or more. Natural control. At a temperature of 15 to 20°C, humidity is a major factor affecting the degree of severity of the disease. Only when the relative humidity of the air is more than 80%, a large amount of pathogenic spores are produced. The germination and invasiveness must also be found on the onion leaves. Under the conditions of water droplets or water film, the occurrence and prevalence of onion downy mildew is always accompanied by weather such as rain, fog and dew, especially during the middle to late April to early May. More than three days of foggy weather is the most likely to trigger outbreaks of the disease. Third, control technology: As soon as the onion downy mildew occurs, its prevalence is very fast, so it should be prevention-based, comprehensive prevention and control. 1, the implementation of rotation down. It is necessary to implement a rotation of 2 to 3 years or more on crops other than onions. 2. Dispose of the sick body in time. At the time of harvest, the diseased body was brought out of the field and deeply buried. 3. Pre-planting seedbed protection. With 72% cream urea manganese zinc wettable powder (Kelu) 500 ~ 600 times on the seedlings onion seedlings sprayed 2 to 3 times for protection, reduce the strain rate. 4, spray protection before the onset of the field. Can be used in the first half of April, with 70% kill dry suspension 600 times, spray every 7 days, and even spray twice. 5, the incidence of prevention and treatment. At the beginning of the disease, 72% of cream urea Mn-Zn wettable powder (Kelu) was sprayed at 600 times. There is a popular trend in the disease or early stage of epidemics. 52.5% of fast dispersible granules are sprayed at 1500-2000 times. Every 7 to 10 days spray again, even spray 2 to 3 times. Note that in the onset of illness, such as in the event of rain or heavy fog, heavy dew weather, and watering, it should be sprayed once in a timely manner to prevent the disease from worsening.
Introduction of Milking Parlor/ Automatic Milking Parlor
Milking Parlor is the best choice for large-scale farm equipment, milkers can work in place, reduce labor intensity, from the inlet to the cow cattle exports generally set to 8 minutes or so, It can milk many cows at a time. Meanwhile, the fresh milk more clean than manual milking.
Excellent performance and high efficiency milking, milking parlor making it the world`s benchmark products.
Milking Parlor Milking Parlour,Automatic Milking Machine Parlor,Dairy Farm Milking Parlor,Automatic Rotating Milking Parlor Henan Leo Husbandry Equipment Science and Technology Co.ltd , https://www.chinaleodairy.com
