"Affected by the epidemic in the early stage, the maintenance force was insufficient, and recently we are carrying out centralized rectification actions." In a woodland in Chongmingmiao Town, conservators are using machinery to cut off a Canadian yellow flower. The reporter saw that this invasive alien species has grown wildly here, and some of them are already more than one person tall. Not only Chongming, but also many woodlands, wastelands, stoppage sites, and even the green belt of the central urban area can see the crazy growth of a Canadian yellow flower, and the relevant departments are gradually cleaning up. According to statistics, as of now, Chongming alone has removed more than 230,000 acres of Canadian yellow flowers.
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In the spring, no one cares, and a yellow flower in Canada grows wildly
Spring is the season when a yellow-flowered seedling in Canada begins to grow. However, this year, affected by the epidemic and unmanaged, a yellow flower in Canada began to grow wildly. Yesterday, the reporter saw in a woodland in Chongmingmiao Town that a yellow flower in Canada has grown a large piece of wild, and some plants are already more than one person tall.
A yellow flower in Canada that does not bloom may not be recognized by ordinary citizens.
A new kindergarten site in Baoshan has been shut down for nearly 3 months, and all kinds of weeds, including a yellow flower in Canada, have grown wildly, and before the shutdown, there were almost no weeds at this site. "In the past 3 months, I have seen the weeds on this site grow up little by little, growing taller and taller, and many of them should be a Canadian yellow flower." Mr. Cao, who lives near the construction site, said.
At the construction site of Baoshan, a weed such as a yellow flower in Canada grew barbarically.
"There are a lot of yellow flowers in Canada here." Mr. Gu, who lives in Songjiang, said that probably because there was no one to maintain it in the early stage, a Canadian yellow flower in the woodland grew out, more and more, these two days have seen forestry maintenance workers cleaning, but the number is too much, it is estimated to clean up for a while, "In addition to a Canadian yellow flower, this year's Peng and other weeds are also very much, a while ago I saw a number of roads on the sidewalks are." ”
"I saw a Canadian yellow flower on the wasteland and on the side of the road here." Mr. Wu, who lives in Qingpu, also said that he saw more Canadian yellow flowers.
Not only woodland, wasteland, and work stoppage sites, the reporter also found a yellow flower in Canada in the green belt of the central urban area. "Originally, there were green maintenance workers in the community, and there was no one to maintain it in the early stage, so this year there were also a lot of weeds in the community, and recently it was slowly weeding." Ms. Yang, a resident of a residential area in Baoshan, said.
A Canadian yellow flower in the green belt of a community in Baoshan
Carrying out rectification actions, Chongming alone has cleared more than 230,000 mu
In the face of the spread of a yellow flower in Canada, an invasive alien species caused by the impact of the epidemic, the relevant departments in the relevant areas are gradually removing it. In Chongming, in view of the current situation of a large number of yellow flowers in Canada in woodland and green areas, in order to effectively curb its spread and spread, and build a solid ecological safety barrier, Chongming townships and relevant departments have carried out special rectification actions under the premise of strictly implementing epidemic prevention policies. Up to now, more than 230,000 acres of yellow flowers in Canada have been removed.
In the temple town roundabout canal landscape corridor, forestry maintenance workers use a cutting rod machine to cut off a Canadian yellow flower to prevent it from flowering. Workers say that because a yellow flower in Canada has now grown up, it is not easy to cut even with a machine, unlike when it is tender and easy to cut in the spring seedlings. "The reason why a yellow flower in Canada can flood in a very short period of time is because after flowering, the seeds spread with the wind and take root everywhere. Therefore, it must not be allowed to spread its seeds. An expert from the Municipal Forestry Station said.
In accordance with the principle of focusing first and then general, Chongming took the lead in removing a Canadian yellow flower on both sides of the main roads such as Chenhai Highway, North Coast Highway, and Ecological Avenue. Up to now, more than 230,000 acres of yellow flowers in Canada have been removed. Just last November, during the flowering period of a yellow flower in Canada, Chongming also carried out a centralized rectification action for a yellow flower in Canada.
In the next step, the relevant departments will carry out daily inspections of forest land according to their growth characteristics, and at the same time further increase the scientific publicity for removing a branch of yellow flowers in Canada, and mobilize the people to participate in prevention and control.
"A yellow flower in Canada must mobilize the whole society and the people will come together to remove it." According to the relevant person in charge of the Songjiang Forestry Station, the removal of a Canadian yellow flower has been included in the daily work content of Songjiang forestry conservation, but in other areas such as the front and back of the house, on the vacant land and other areas of the Canadian yellow flower to rely on everyone to act together.
Experts said that for the plot after the removal of a Canadian yellow flower, it should be replanted in time to allow native plants to quickly compress the ecological niche of foreign plants and prevent the "comeback" of a yellow flower in Canada.
Woodland conservation workers have removed a large patch of Canadian yellow flowers.
Each individual plant produces more than 20,000 seeds a year
According to the data, a Canadian yellow flower was introduced to Shanghai, Nanjing and other places as an ornamental plant in the mid-1930s, initially planted in the garden, and then "escaped" to the wild to become a vicious weed, posing a huge threat to China's socio-economic, natural ecosystem and biodiversity, and was included in the "Second Batch of Invasive Alien Species in China" in 2010.
Yan Jing, an engineer at Chenshan Botanical Garden, introduced that "a yellow flower in Canada" first appeared in Mr. Chen Fenghuai's "Handbook of Cultivated Plants in Lushan Botanical Garden" (1958), which was introduced and cultivated in Lushan Botanical Garden in 1936, and Mr. Xu Bingsheng's "Shanghai Botanical List" (1959) first reported that this species was naturalized in Shanghai, until the 1980s began to spread into malignant weeds.
Its fecundity is extremely strong, each independent plant can produce more than 20,000 seeds a year, seeds can spread by wind, occupy the ecological niche of native species through strong competitiveness, make local species lose living space, and release allelopathic substances to inhibit the growth of other plants, form a large area of single-excellent community, and reduce species diversity.
Some Shanghai plant experts have done statistics, for decades, a yellow flower in Canada has led to the demise of dozens of indigenous plants. Therefore, a canadian yellow flower is also known as "overlord grass" and "poisonous grass", the so-called "yellow flower blooms where a hundred flowers kill".
Every autumn, a yellow flower blooms in Canada, after which the fruit spreads with the wind (data map).
Over the years, Shanghai has strictly prevented and controlled a yellow flower in Canada, and has carried out many large-scale clearance operations, which has led to a large-scale reduction of a yellow flower in Canada, and only sporadic discoveries. However, in the past two years, some experts have proposed that this invasive species seems to have a comeback trend in Shanghai and the surrounding areas of the Yangtze River Delta, and suggested that special prevention and control be carried out. On December 24, 2020, the Municipal Greening and City Appearance Administration issued the Notice on Strengthening the Eradication of "Canada's Yellow Flower", requiring the strengthening of joint prevention and control and the establishment of a cross-departmental eradication and coordination mechanism. At the same time, it is necessary to make comprehensive use of various propaganda means to strengthen the popularization of science on their characteristics, hazards, and prevention knowledge, improve the public's awareness and participation, and jointly prevent and control them.
Searching the Internet can find that every November, a yellow flower in Canada is in full bloom, and there are many relevant reports, because it is easy to identify and find them during this period, and a yellow flower is seen at a glance. In November last year, a yellow flower in Canada was also on Weibo's hot search.
Reports of a yellow flower in Canada are most concentrated in November.
However, some experts said that they should not "kill" Canadian yellow flowers with a stick, because they can grow in harsh environments such as construction sites and open spaces, which maintain the water and soil in these places to a certain extent and play a role in curbing dust. In this sense, it is obviously impractical to plant trees in urban construction vacant land that has been shelved for a while, because construction sites may have to start before the saplings grow into forests.
In addition, experts also said that any plant has its living environment, and a yellow flower in Canada likes the sun, and it is rare to survive in the shade.
A Canadian yellow flower also appears in the flower market, called "yellow warbler flower". According to the research of relevant researchers, more rigorously, the "yellow warbler flower" in the flower market and the Canadian yellow branch in the wasteland belong to the genus Asteraceae, which has about 100 species.
Experts believe that although the probability of a yellow flower in the flower market causing invasion harm is small, but due to the market demand for cut flowers and the risk of invasion caused by the large number of planting of this species, therefore, for the "yellow warbler" to sell in large quantities, it should be paid attention to, at least not discarded.
The "Yellow Warbler" in the Flower Market