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"This grass is called ragweed.

It is an invasive alien species.

Its harm to human health and the ecological environment

They are all very large.

It must be eradicated completely..."

On July 8, the "law enforcement blue" members of the Gardening and Greening Department of the Shenyang Municipal Urban Management Comprehensive Administrative Law Enforcement Bureau held up the ragweed that had just been pulled out and introduced to reporters the harmfulness of the invasive alien species ragweed.

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According to experts, ragweed is a malignant weed belonging to the Asteraceae family and the genus Ambrosia. It is native to North America and is one of the world's recognized harmful plants. It is known as the "plant killer" and is now widely distributed in Northeast China, North China, Central China and East China.

This weed reproduces very quickly and can be spread by people, livestock, birds, wind, water, etc. It grows mostly on roadsides, fields, riversides, and wetlands. Once it invades, it will quickly occupy the living space of other plants.

There are two main aspects of the harm caused by ragweed: first, it grows fast, competing with other plants for fertilizer, water, and light, dominating the land, and its water consumption is two to three times that of ordinary plants, seriously affecting the healthy growth of surrounding plants;

On the other hand, its pollen can cause coughing, asthma, nasal congestion, sneezing, and even urticaria, chest tightness, and emphysema in people with allergic constitutions, and in the most severe cases, it can lead to death.

There have been reports from many places. In July last year, Ms. Zhang, who lives in Chengzitan Town, Pulandian District, discovered that a plant called three-leaved ragweed appeared in the center of the town, some of which grew in patches in front of and behind houses.

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Mr. Peng, who lives in Xingtai Town, Pulandian District, said that this grass grows very fast and has a strong ability to occupy land. Taking the vacant land around his house as an example, he found that local weeds such as Artemisia sphaerocephala were growing there two years ago, but since the year before last, these vacant lands have been occupied by Ambrosia trilobata. "Local weeds can't beat it at all, and it can't be eliminated without human intervention," Mr. Peng said.

In addition, Mr. Peng said that he once used a sickle to cut some of this grass, and soon he developed chest tightness, shortness of breath, and swelling of the eyes and throat. The symptoms were relieved after he went to the doctor. "Then I learned that this grass is 'toxic' and can easily cause allergic reactions," he said.

Netizen "Guandong Youxue" is a fan of the rural areas. In recent years, he has been paying attention to the development of three-leaf ragweed. He said that the distribution of three-leaf ragweed in the rural areas of Chengzitan is more serious.

In June last year, "There is Snow in Guandong" set out from Jinshan Village, passing through Miaotun, Yongli River, Yuanfa and other places, to investigate the growth of three-leaf ragweed around the farmlands from Yongli River to Diaoqiao River. Judging from the pictures he took at that time, it could even be described as "flooding".

There are generally four methods for controlling ragweed:

Physical method: manual removal.

Chemical method: Spray chemical herbicides, but long-term use will cause ragweed to develop resistance.

Biological method: Use natural enemy insects or pathogens of ragweed plants to control the spread of trifoliate ragweed.

Plant substitution method: artificially cultivate plants with strong competitiveness to compete with ragweed, thereby inhibiting its growth.

I hope that the general public will pay attention to the harm caused by ragweed, and take action together to eradicate ragweed and protect our beautiful home.

Source: Science Popularization China WeChat Official Account

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