On September 27, on the east side of Building 7 in the south district of Yixin Homestead
Crawling with caterpillars, residents can only go around
On the afternoon of September 27, the property staff of Yixin Homestead South District sprayed control agents on the trees.
scene
Caterpillars appear in dense numbers
It makes the scalp tingle
"I was playing with my grandson, and suddenly I found that something had turned on my head, and it was actually a caterpillar!" According to the addresses provided by many readers, the reporter visited Dingshun Jiayuan West District, Shijingyuan, Yixin Homestead South District, Yulong Third District, Jixiang Garden and other places to investigate the specific situation. The reporter observed that the problem of the surge in the number of caterpillars has appeared in many communities in Shunyi. Some of the trees' leaves are eaten from the inside out by caterpillars, and the parts that are eaten have dried up and turned yellow. At the forks of some tree branches, there are nets of caterpillars, and many larvae are squirming on the nets, making people's scalps tingle. Although some trees look lush from a distance, standing under the tree and looking up, you can see dense caterpillars squirming and eating leaves. Caterpillars are so dense that residents are afraid to walk or stay under the trees.
The trunk is covered with caterpillars and their nets
"I don't dare to stay under the tree." Subsequently, the reporter saw that many convenience facilities and sidewalks in the community were attached to a layer of black secretions of caterpillars, affecting the use of residents. There are even hundreds of caterpillars crawling on a car in a certain neighborhood, making people dare not get close. When residents walk on the sidewalk, they must also avoid stepping on secretions, and individual residents simply walk on the motorway. In addition, the reporter noticed that on many trees on the streets of Shunyi, a large number of caterpillars also appeared, which nibbled the leaves. However, the reporter's investigation found that the surge of caterpillars is not unique to Shunyi, and a large number of caterpillars have also appeared intensively in other areas such as Wangjing and Fengtai.
Not only on the tree, Dingshun Jiayuan West District residential building
There are also many caterpillars lying on the wall
The caterpillar crawled into the houses of the residents
Some residents said the caterpillar also "threatened" the environment in their homes. "This caterpillar has crawled into the house through the doors and windows." Ms. Wang, a resident of Hong Kongxin East District, told reporters that once she saw the staff spraying medicine on the tree, spraying some caterpillars on their own balcony, thinking that they had died, they did not care, did not expect that in just a few days of effort, the flowers and grass they planted were about to be eaten up. "Hurry up and govern, our living space is 'squeezed' by caterpillars, bad heart!" Resident Mr. Lee also said.
On September 26, a car in the community
Hundreds of caterpillars crawl, making people's scalps tingle
Insect-infested trees in the community
Probe for causes
This year, Beijing has received frequent rainfall, high temperatures and high humidity
The environment is conducive to the breeding of American white moths
So the question is, what kind of bugs are these, and why are there so many bugs this year?
Yang Zhongqi, chief expert of the Chinese Academy of Forestry, introduced that this caterpillar is actually the larvae of the American white moth. The reason why it has appeared in Beijing in large numbers recently is because the high temperature and humidity in Beijing this year are conducive to the growth of American white moths. At present, there are two main ways to cure the American white moth, one is to prune the branches and leaves, and the other is to spray drugs. However, after entering the flood season this year, Beijing has frequent rainfall, continuous high temperature and high humidity, and climatic factors such as cloudy days are conducive to the growth and reproduction of american white moths. As a result, the number of white moths in the United States has grown significantly more this year than in previous years. Yang Zhongqi said that at present, the temperature in Beijing is still relatively high, and the climatic conditions are suitable for the survival of the American white moth, so the American white moth has appeared three times in Beijing this year.
The above-mentioned caterpillar is actually the larvae of the American white moth, which has the characteristics of fast reproduction, great harm and wide spread.
In addition, the staff of the Beijing Municipal Landscaping Bureau introduced that the impact of frequent rainfall on spraying insects is also very large, "sometimes even several times a day, the medicine has been washed away, the effect is discounted." To this end, the staff can only grasp the "window period" to continue to spray drugs, but the effect of drug prevention and control is still under the action of rainwater, which has weakened.
The webs formed on these trees are not spider webs, but are derived from an invasive pest: the American white moth.
The larvae of the American white moth will gather hundreds of fish together to spit out a silk knotted net and tie the leaves together to feed on it. They "report to the group for heating", and the net is many and dense, so the resistance is very strong.
countermeasure
Spraying, insect control, disconnection
Full -- "sniping" the American White Moth
In view of the above situation, Shunyi District continued to actively "snipe" the American white moth through a series of measures such as spraying, insect prevention, and disconnection of the net. This reporter saw in Dasun Gezhuang Town, Yixin Homestead South District and other places that the staff of the property and village committees and other departments sprayed prevention and control agents on the trees. On a number of trees in Places such as Yongjun Road, the reporter also saw the silkworm pupae-shaped Zhou's small bee, which is the natural enemy of the American white moth.
On September 23, the staff of the Shunyi District Garden and Greenland Management and Protection Center sprayed medicine on the sidewalk tree opposite the Dongfeng Primary School on Yongjun Road.
The staff of the Shunyi District Garden and GreenLand Management and Conservation Center released the Zhou's little wasp to biologically control the American white moth.
The reporter learned that as of September 24, the Shunyi District Garden Greenland Management and Protection Center has sprayed about 140 tons of diluted medicinal solution on the sidewalk trees on both sides of 10 roads, such as Yongjun Road, Shunbai Road and Right Causeway Road. At the same time, in the area where trees are concentrated near the urban area (Qianliang Road, Jianxin East Street, etc.), more than 1,200 Zhou's small peaks are released. The staff also used the method of manually cutting the mesh screen, cutting the larval wire mesh to block its transmission.
At Meilan Homestead, China Overseas Property staff
Spray insect repellents on the walls
Sprayed and killed by property work
Dense caterpillars fall to the ground
In addition, the District Landscaping Bureau has set up a special class for the prevention and control of american white moths at the district level headed by the director of the bureau, and on-site inspection and guidance of the prevention and control work of each town street. It is reported that as of September 26, the whole region has dispatched more than 40 aircraft to prevent and control more than 40 times, more than 3,000 various types of prevention and control vehicles, nearly 10,000 personnel, the use of various drugs nearly 15 tons, the release of the United States white moth natural enemy insect - Zhou's small bee 100 million heads, prevention and control area of 370,000 mu. Staff said that if residents find American white moths or their larvae in the community, they can report it to the property or landscaping department.
The town streets are under the guidance of the District Landscaping Bureau
Carry out the control of the American white moth
Staff manually cut the mesh screen of american white moth larvae
Yulong District 4 Neighborhood Committee, Property
Staff work together to control pests
News memory
The reporter's inquiry found that the American white moth is distributed in Many places such as Tianjin, Hebei Province, and Liaoning Province, but it has now crossed the Yangtze River and is distributed in Hubei Province, Anhui Province and Jiangsu Province. According to the survey, the American white moth can harm more than 80 species of trees, fruit trees, flowers and crops such as tung, white wax, ailanthus and mulberry trees. The U.S. white moth has been included by the State Environmental Protection Administration in China's first list of 16 invasive alien species.
Wen and photo/Beiqing Community Daily reporter group