Recently, CCTV broadcast a message: guangdong province such as Huizhou, Shenzhen appeared in this kind of creature, and there are signs of flooding, the program experts warned the public not to touch, let alone eat, what is the matter?
01. 5.4 million mu of farmland was killed
As May approaches, the temperature in the south rises, and the creatures in the farmland begin to come alive, and things like fushou snails also appear in fish ponds, lakes, ditches and other places. On some stones, you can also see the eggs produced by the Fushou snail, which are brightly colored, and the child wants to touch it with his hand after seeing it.
However, they do not know that the harm of Fushou snails to agriculture is huge, they are competing with humans for rations, and once they spread, it will lead to a reduction in vegetable and rice yields.
Recently, the reporter came to the Shaoshan Irrigation District in Hunan Province for an interview, and found a large number of traces of the breeding of Fushou snails along the way, and saw a large and clump of eggs on the side of the reservoir and pond, and even "stained red" a certain water training base.
However, many local people do not know that Fushou snail is a harmful substance, in this regard, Dai Qingming, Xie Nianbao experts for the public to popularize the harm of Fushou snail to agricultural production:
1. Affect the growth of vegetables
Fushou snail is extremely easy to feed, it grows the fastest in the environment of 25-32 degrees Celsius, likes to eat plant leaves, so it is very harmful to the cultivation of aquatic crops such as lotus root and zibai in the south.
Once the fushou snail appears in the water body, these aquatic crops will face the disaster of yield reduction, and the production will be reduced by about 50% if it is seriously damaged.
2. Grain production has decreased
Rice is mainly cultivated in the south, and rice is also the staple food of the mainland. In the early stage of rice growth, Fushou snail is easy to nibble on seedlings, so that the seedlings are fewer plants and the rice growth is thin, which in turn reduces the yield of rice.
Judging from the relevant data of the Hunan Department of Agriculture, some areas are affected by Fushou snails, the rice field shortage rate is 20%, the rice yield is greatly affected, the yield per mu is reduced by 5-10%, and the serious damage is reduced by 30-50%, which not only aggravates the economic losses of farmers, but also endangers the food security of the mainland.
3. Deteriorate the environment
Over the years, in order to sanitize Fushou snail, drugs have also been used to kill, but its resistance is relatively strong, and the reproductive speed is too fast, a female snail can produce 300,000 eggs a year, and as long as 15 days can hatch into a juvenile snail, 2 months can enter the sexual maturity period, breeding again.
Therefore, once the Fushou snail is widely bred, it will seriously damage the ecological environment of the water body, compete with other organisms for sunlight and water, and damage the local ecological chain. Allowing it to multiply will also make the eutrophication of the water body increase, and the water quality become worse.
It is reported that in 2021, 95 counties and cities in Hunan will suffer from fushou snail erosion, and its occurrence area will reach 5.4 million mu. For example, in Hanshou County, high-incidence areas, the density of Fushou snail larvae in the rice field reached 100,000 / mu, and Lao Liu, a large grain grower, said: "Last year, more than 200 mu of land was contracted, of which 170 mu of land was plagued by Fushou snail, and there were 20 Fushou snails per square meter. ”
Now that the Snail has entered the peak period of spawning, if it is not killed at this time, more farmland will be endangered.
02, why can't I touch it, can't I eat it?
Nowadays, Fushou snails have been flooded in Hunan, Guangdong and other places, and many experts have given warnings, do not touch, let alone eat.
After many people see Fushou snail, they think it is a field snail at the first glance, and then think that it can be eaten. After all, the alien species of crayfish is due to the contribution of foodies, so that it can only rely on farming to meet domestic demand.
The meat of the field snail is delicious, and the larger Fushou snail can also be made into a delicacy?
In fact, the reason why Fushou snail spread in the mainland was originally introduced because of "eating".
As early as 1979, the Argentine overseas Chinese introduced Fushou snails to Taiwan, which was discarded because the meat quality was not too good.
2 years later, the Brazilian Chinese saw that Chinese mainland there was no Fushou snail, and believed that the Fushou snail was rich in nutrition, easy to breed, and there must be a market in the mainland, and then introduced into Zhongshan City for trial breeding.
Due to the suitable climate and abundant water bodies, Fushou snails were soon successfully farmed and then promoted to the whole province of Guangdong. Subsequently, Guangxi, Fujian, Sichuan, Hunan, Yunnan and other places have also introduced aquaculture.
Because Fushou snail is easy to breed, many people follow the trend of breeding, coupled with the low market price of Fushou snail, more meat, but also attracted a lot of foodies, two-pronged approach, Fushou snail in more than 10 provinces in the south of the breeding, but just more than ten years later, an "ecological defense war" began.
It has been found that in places where Fushou snails are dense, agriculture is a huge hazard, especially adverse effects on rice. For example, in the first seven years of farming, 130,000 hectares of rice fields in 37 counties in Guangdong were invaded by Fushou snails.
In 2003, the Fushou snail was listed as one of the first major invasive alien species, and then the "human snail war" that lasted for more than ten years began and has continued to this day.
In addition to its impact on the environment, it is also a huge hazard to human health. For example, in 2006, the Beijing cold snail incident caused an uproar, and diners soon had symptoms such as headaches, itching, and facial paralysis after eating, and the victim group reached more than 160 people.
In 2017, a woman couldn't help but eat Fushou snail, but then she was tortured for half a year, and the physical examination found that the parasite had entered her brain, and when she was treated, she took too many hormone drugs, causing huge damage to her body.
So, why does Fushou snail cause harm to the human body? The study found that there are more than 6,000 parasites in a Fushou snail, including Guangzhou tube roundworm and curling spiny mouth fluke. These parasites are resistant to high temperatures, and it is difficult to kill them by normal cooking, and once the human body eats them by mistake, it will become sick.
Therefore, experts suggest that you must not eat it or touch it at will, otherwise there is also a risk of parasite infection.
In order to control the Fushou snail, various places have launched an eradication war, and now it is mainly based on agricultural control, chemical control and biological control, of which chemical control has the best effect, but the spraying of insecticides will also affect farmland and ecology.
Biological control is to feed ducks in farmland and let ducks eliminate Fushou snails, but the actual operation is not feasible, and we must also be vigilant against the risk of parasites transmitting parasites to humans after eating Fushou snails.
Killing Fushou snail is a long-term sustainable process, it is not easy to completely kill, but as long as it is controlled from the source, strengthen quarantine, strengthen prevention and control means, and increase technical research, I believe that a suitable killing method will be found.