How to manage scientifically when many places in the north enter the high-incidence period of willow catkins？

　　Spring is full of flowers and vitality, but it also brings some troubles. From yesterday (12th), Beijing entered the first high-incidence period of willow catkins, which mainly affected the inner city of the Fifth Ring Road. Populus tomentosa was the main species of catkins. The Beijing Municipal Bureau of Landscaping and Greening and the Beijing Meteorological Bureau jointly issued a forecast for the beginning of willow catkins.

　　Beijing: willow catkins enter the first high-incidence period.

　　From April 7th, the catkins of willows began to float in Beijing, and the whole process is expected to last until the end of May, totaling about 50 days.

　　Jaco, Deputy Director of Science and Technology Department of Beijing Municipal Bureau of Landscaping and Greening.In the season of flying flocks, we strengthen joint defense and linkage with urban management departments, health and health departments and meteorological departments, and bring the prevention and control of flying flocks into the scope of fine management of the whole city to improve the monitoring of flying flocks. Let the public know when there are flying flocks and which key areas are flying flocks, increase cleaning and humidification, and suppress flying flocks in time.

　　It is estimated that there will be three rounds of high incidence of floc in spring and summer.

　　According to the forecast of Beijing Garden Department, this kind of flying catkins will occur three times in spring and summer. From late April to early May, flying catkins mainly affect the main city and plain areas, and in mid-May, it mainly affects the mountainous areas. Each round of high-incidence period is generally about one week, and the high-incidence period is from 10 am to 4 pm every day.

　　So, where did these flying flocs come from? Poke the video ↓ Look at the self-report of a poplar.

　　I am a poplar, and my friend Liu Shu and I are native trees in Beijing, and have settled in Beijing since the 1960s and 1970s. Every spring, after pollination, our female plants will produce small capsules, which are wrapped in white flocculent hairs, and some seeds the size of sesame seeds are hidden in the hairs. When the mature capsule splits, the fuzz will fly with our seeds in the wind, which is what you can see.

　　Therefore, the flying floc itself has obvious seasonality and periodicity, and it is a harmless natural phenomenon. However, when it comes to weather with rising temperature, sufficient sunshine and low air humidity, "children" will have fun and fly all over the sky, which will have an impact on everyone’s life.

　　Physical prevention and control, scientific and technological means, multi-measures to control flying flocs

　　Willow spreads seeds by wind, and breeds offspring, which makes people hard to prevent. At present, Beijing is taking comprehensive prevention and control measures for flying flocks in many parks and streets in the main city to minimize the interference of flying flocks on people’s lives.

　　General Desk reporter Gao XueToday, the weather in Beijing is sunny and dry, and the wind force reaches level 4. We can see some flying flocs flying in the air. At present, the main source of flying flocs at this stage is poplar.

　　There are some willow tidbits falling down on the ground, which are wet. There are many tidbits like this on the nearby lawn, and the damp white flying tidbits are directly attached to the lawn, so they can’t dance with the wind.

　　In the period of high incidence of flying flocks, like the Beijing Olympic Forest Park where we are located, the key areas will be humidified and cleaned twice a day, and the tidbits will be knocked down with high-pressure water guns, which will increase the surface humidity and greatly reduce the flying flocks.

　　In addition to the wetting operation, it is also a means to control the total amount of flying flocs by pruning some branches in advance before the willow capsules crack and produce flying flocs.

　　In addition to physical prevention and control, according to the principle of combining the length with the length and treating both the symptoms and the root causes, the landscaping department of Beijing has also adopted scientific and technological means such as grafting male plants, raising seedlings through science and technology and improving tree species.

　　The seedling in this small flowerpot, which is in the hardening stage, is the artificially selected male non-flocculent Populus tomentosa-"Jingxiong No.1". In about two years, this seedling can grow to a height of about 5 meters, and it will be used as an urban landscape tree.

　　Some viewers may also ask, since female willow trees will produce flying flocs, why not just cut them down? In an interview, the staff of Beijing Bureau of Landscaping and Greening told us that willow trees have settled in Beijing for decades, such as this piece of Yang Shulin, with an average age of nearly 20 years.

　　The highest in the center of this picture is poplar, with an average height of about 25 meters. In front of the red building is Liriodendron, with an average height of 12 to 15 meters. In addition, there are Magnolia grandiflora and Pinus tabulaeformis commonly seen in Beijing, which are much shorter than poplar trees in height. Therefore, poplars have always been called the green skyline of Beijing. Without poplars, it means that the green skyline of Beijing will drop by about 10 meters, which will do great harm to the landscape and ecology of the whole city.

　　At present, the volume of willow trees in Beijing accounts for about 40% of all trees, and about 5.7 million trees can be accurately located and monitored in the main city. Last year, Beijing has gradually replaced about 20,000 "old, weak, sick and disabled" poplars with cultivated male non-flocculent Populus tomentosa, and the number of seedlings has reached 50,000.

　　It is a long-term process to control flying flocks. Through continuous scientific prevention and control, I believe that the impact of flying flocks on our lives will gradually decrease in the future.

　　Shandong: The combination of physical and chemical means to control the "disturbing people" caused by flying flocs

　　As the temperature rises, not only in Beijing, but also in many places in the north every April and May, there will be fluttering willow catkins. How to reduce the trouble of "disturbing the people" by flying catkins? Let’s see what measures Shandong has taken.

　　There are many Populus tomentosa in this residential area in Zhangdian District, Zibo City, and the local area has adopted the method of combining physical control with chemical control to control flying flocs.

　　Li Tiandong, Deputy Section Chief, Maintenance Department, Zhangdian District Comprehensive Administrative Law Enforcement Bureau, Zibo City, Shandong ProvincePhysical prevention is to use high-pressure waterwheel spraying and fog gun truck to accelerate settlement, and then to combine mechanical sweeping with manual cleaning in time. In chemical control, female plant flower bud inhibitor is mainly used to reduce flower bud differentiation.

　　In Dezhou City, the urban management department is comprehensively counting the male and female willow trees within its jurisdiction and carrying out targeted treatment such as drug control. Up to now, 112,400 poplar trees have been identified and marked in urban areas, including 59,600 female trees and 52,800 male trees.

　　Gao Na, Senior Engineer, Landscaping Service Center, Dezhou City Administration Bureau, Shandong ProvinceAccording to the previous general survey, we managed the willows in the jurisdiction by setting points, routes and personnel. The introduced "Beilin No.1" poplar male plant variety has been successfully cultivated, and the next step can be to replace and update the female willow plant in the green space.

　　Small coup of life: flying floc protection and cleaning have doorways

　　Flocculation is flying all over the sky, and sometimes it is easy to fly into people’s eyes and nostrils, causing discomfort. So in the period of high incidence of flying floc, what aspects should we pay attention to when traveling and exercising, and look at the small coup ↓

　　Jaco, Deputy Director of Science and Technology Department of Beijing Municipal Bureau of Landscaping and Greening.The high incidence period of flying flocs in each area is very short, only 3 to 5 days. In these three to five days, I suggest that one of the citizens who travel is able to wear a mask in time; Second, exercise can be carried out in the morning or evening, when flying catkins are not high every day. At home, for example, flying floc can be suppressed by watering can or vacuum cleaner, because flying floc has good hydrophilicity, and it will not fly as long as it touches water.

　　Experts remind that people with allergic skin should try to avoid skin contact with flying flocs. If allergic symptoms appear, they should go to the hospital in time and use antiallergic drugs to relieve symptoms under the guidance of doctors. Do not take medicine by yourself or ignore symptoms, so as not to aggravate the condition.

　　Fire warning: flying flocs are flammable and must be guarded against.

　　During the flying season, in addition to preventing allergies, we should also raise awareness of fire prevention. The main component of flying floc is fiber, and it contains a lot of vegetable oil, which is easy to burn when it meets a fire source, causing a fire. Look at the tips given by the fire department.

　　Catkin is extremely flammable, burning fast and dangerous. Don’t light catkins at will. After landing, catkins can be cleaned in time by splashing water, sweeping and burying, so as not to leave a fire hazard. Don’t put combustible materials such as cartons, branches and woodpiles around buildings, and pay more attention to cleaning combustible materials in time to eliminate hidden dangers; Poplar catkins attached to combustible materials should be cleaned up in time to prevent them from igniting combustible materials.

　　Wang Peng, a fireman of Daxing District Fire Brigade.Whether indoors or outdoors, you must take good care of the fire and don’t throw cigarette butts around to avoid fire. Schools and parents should strengthen the education of children, and it is forbidden for children to play with fire, let alone light catkins for fun and curiosity.