Is Chengdu's "mosquito -free park", is it a gimmick or pioneering?

Author:China Flower News Time:2022.07.27

Author: Li Xin;

Edit, production: Li Zhanyi

Recently, Chengdu is about to launch the first "mosquito -free park" news on the Internet. Whether it is a garden practitioner or ordinary citizen, it is full of expectations for this initiative. Because for thousands of years, mosquitoes have been the biggest enemy of summer parks and courtyards: as long as there are 3 cm deep water, mosquito can breed a generation in about 7 days; after a bite, itching feels difficult to dispel.

Can "mosquito -free park" really achieve?

How to destroy mosquitoes "mosquito -free parks"

It is understood that the "Mosquito -free Park" that will appear in the Jinjiang River in Chengdu is a living water park with 25 years of age, and the effect of mosquito -free effects mainly relies on 50 square boxes -the world's first air catcher system.

Chengdu Live Water Park

The working principle of this mosquito catcher is to simulate human breathing. By collecting carbon dioxide in the air, the carbon dioxide concentration can reach the level of human body, so that mosquitoes mistakenly think that people are breathing, thereby achieving the purpose of healthy and efficient mosquitoes. The entire mosquito extinguishing process does not produce any chemical pollution, optical pollution, and noise pollution.

The staff said that after the installation of the 50 mosquito -catching machine system was completed, a 21 -day mosquito density monitoring was carried out. A total of 1,1650 mosquitoes were captured, mainly due to tired warehouse mosquitoes (often appeared in sewage areas) and white -wicing mosquito ( It is what everyone calls black flowers).

50 mosquito catcher distribution maps in the live water park

The monitoring results show that after the mosquito catcher is enabled, the mosquito density of the park has dropped from the initial 3.46/[Taiwan · hour] to 0.18/[Taiwan · hour], which basically achieves the mosquito -free environment in the park.

In order to experience the effect of mosquito -free, local reporters reported on the matter in the park either walking, or sitting and chatting, and also drilled into the dense plants to take pictures. Essence

But can this practice really allow the park to achieve "mosquito -free" effect? Some internal industry experts raised objections.

It's not enough to kill adults

"I think this mosquito -catching system can only solve the surface problems, but it does not change the living environment of mosquitoes, such as breeding land, food source, place of rest, etc., especially the breeding ground." Dr. Zhou Jizhong, the person in charge, told the reporter of the China Flower News that according to the consensus of anti -mosquito and mosquito -controlling mosquitoes at home and abroad, it is necessary to first solve the problem of mosquito breeding places. It is impossible to truly achieve mosquito -free effects without controlling larvae.

"The latest article published on Nature shows that the role of carbon dioxide is to attract mosquitoes from long -distance. But whether mosquitoes are dingling, which is related to the smell of human skin, which is also related to the efficiency of mosquito catcher." He said.

Zhou Jizhong said that mosquito breeding ability is extremely strong. In the case of appropriate temperature, it usually breeds once every 7 days, 200 to 400 spawning each time, and it takes about 10 days from egg to bite people. If you only kill adults and do not control the larvae, then "mosquito -free park" is just a gimmick.

"In the report, 50 mosquito catcher caught more than 10,000 mosquitoes in 21 days, and the number is not enough. Because if there are dozens of mosquitoes in the park, with their reproductive ability, the speed of mosquito catching will be far from far away. Slowness than the natural growth of mosquitoes, "Zhou Jizhong said.

If you think about it, the 50 mosquito catcher is like 50 people who take off their clothes. They stand still and recruit mosquitoes and come to shoot one by one. Unlike tourists, they can work 24 hours ahead, constantly attract and kill mosquitoes. However, if there are new mosquitoes hatching and "mosquito density" cannot continue to decrease, tourists may still be bitten.

In addition, Zhou Jizhong mentioned that although the experience reporters were not bitten in the park for an hour and a half, it was likely to be related to the speed, time, and wind of the walking speed, the time and the wind at that time. "During the day, strong wind and people walking quickly, it is difficult for mosquitoes to bite you," he said.

Another thing is cost. It is understood that the price of imported products for air cash with air is more than 10,000 yuan, and domestic goods cost thousands of yuan, and its effect is directly related to the number and density of use. Therefore, if you want to get a good mosquito -extinguishing effect, the cost will not be too low.

Hayani Bio is a professional mosquito repellent brand under Noripin, which has rich experience in eliminating mosquitoes. Its "two dragon -ups" brand focuses on spatial mosquito technology and product research and development, while compatible with disinfection, sterilization, cooling and dust removal, and has been put into application in many parks, courtyards, and private gardens, and outstanding results.

However, Zhou Jizhong said that to achieve a "mosquito-free park", there is a product called S-olexyl essence to mention, which is one of the directions of their company's research and development.

Larvae no longer grow up

In 2021, the 10th China Flower Expo was held in Chongming Island, Shanghai. The hot and humid summer is the season when mosquitoes are frequent, but they have a 370,000 -square -meter ecological water system and 1.37 million square meters of green landscape, but there are few mosquitoes. The secret is S-oxyl ester.

As a kind of insect growth regulator, the biochemical structure and mechanism of S-hyperthyl ester "natural". It can selectively affect mosquitoes. Through the adjustment of the level of young hormones, it interferes with its growth and development cycle, so that the larvae (scientific name) of mosquitoes will no longer grow growing into adults. In the end, it was swallowed by natural enemies such as fishes or gradually became ill.

The staff is using S-oxone.

"Unlike other insecticides '" one pot', the insecticidal solution of S-hydroxyne can also be "different". "Zhao Changqing, deputy dean of the Chongming Ecological Research Institute, said that during the launch, the staff will have the water body. The concentration of the S-olexyl ester is strictly controlled at 5 to 10 PPB units. This concentration is enough to take effect on mosquitoes, but it is harmless to other insects such as dragonflies and butterflies, and fish, shrimp, crab and other water are not affected. "When S-olene is put, people can't smell its smell. Only in high concentrations can we smell slight fruit aroma. At the same time, it can metabolize, degrade into water and degradation into water and in the environment of mammals. Carbon dioxide is an environmentally friendly pesticide, "he said.

As one of the world's most successful biochemical pesticides, S-olene is widely used in the United States, Japan, Australia, New Zealand and other countries. However, due to the classification of biochemistry pesticides in my country, its approval in China is still in its infancy. In 2018, with the demonstration of Academician Qian Xuhong, president of East China Normal University, chemical and pesticide experts, the China Pesticide Involutionary Institute evaluated and determined that S-oxyl ester was biochemical pesticide. Subsequently, for the first time in 2019, the Ministry of Agriculture and Rural Division clarified that biochemical pesticides belonged to biological pesticides.

The ecological mosquito control scheme used at the Chongming Island Flower Expo is tailor-made by the East China Normal University team with S-hydroxyne as the material.

It can be seen that nothing is impossible in front of strong humans. With the development of technology, the real "mosquito -free park" may soon appear. But there is a problem in the reporter's heart. Do we really have to do so well?