What is the trouble of bidding farewell to flying sheep for three years in Beijing?

Du Jianjun, deputy director of the Science and Technology Department of the Beijing Municipal Bureau of Landscaping and Greening, said that Beijing has made up its mind to "control" birds during the "Thirteenth Five-Year Plan" period, and by 2020, the built-up area should achieve the goal of "birds will not cause disasters".

There are 2 million female willows in the built-up area of Beijing, accounting for 5.4% of the total number of landscaping trees. These willows have entered a mature stage, and there are a lot of flying catkins. This year, the city will comprehensively manage 400,000 female willows in key areas by means of tree regeneration, thinning, pruning and chemical flower suppression. By 2020, the city's catkins will be significantly improved, and catkins will no longer be a disaster.

Although willow has so many advantages, the appearance of catkins will still bring you "trouble" for about a month every spring. Willow is a dioecious plant. The flying catkins you see are actually derivatives of female willow seeds, which are scattered with the wind. It is a natural evolutionary way of willow reproduction, which has obvious seasonality and periodicity. It is a harmless natural phenomenon in itself, and more can be enjoyable. Excessive flying flocs will not only affect the urban landscape, but also affect traffic safety. Pollen wrapped in flying catkins will have a certain impact on allergic people, which is also not conducive to urban sanitation and cleanliness.