What are the advantages and disadvantages of insects?

Insects can cure diseases and save lives;

Insects can add wealth to mankind;

They can not only maintain ecological balance, but also predict climate change or disaster;

Insect hazards:

Insects feed on flowers, stems, leaves, roots, fruits and juices of plants, thus causing damage to plants;

Many stored foods, especially meat, cheese, dairy products, flour, etc. , the most vulnerable to insects;

Most human diseases are spread by insects;

Biting causes serious injury or death;

The benefits of insects:

Insects can cure diseases and save lives: There are 365 kinds of drugs in Shennong Materia Medica, and there are 29 kinds of "insects" recorded as drugs, of which 2 1 belongs to insects. Li Shizhen's Compendium of Materia Medica expanded the broad sense of "insect drugs" to 106, of which 73 were insect drugs, which were divided into three categories: oviparous, metaplastic and moist. In the Qing Dynasty, Zhao Xuemin added 32 kinds of animal medicines to Compendium of Materia Medica, including insects 1 1 species. In recent years, it has been found that mylabris, dung beetles, cordyceps sinensis, ants, bees, wasps, cockroaches and some butterflies contain anticancer active substances; Cockroach extract AF2 can treat primary liver cancer; It is found that insect allergy hormone is beneficial to restore liver function and lower blood pressure. For example, silkworm chrysalis powder can treat chronic hepatitis and promote the recovery of liver function.

Insects can increase human wealth: take bees as an example. Bee is one of the most precious insects raised by human beings, and its communication with human beings has a long history. Bees pollinate crops and fruit trees, increase yield, improve seeds and update varieties, promote the development of agriculture and make great contributions to mankind. Bees' own products, such as honey, royal jelly, beeswax and bee venom, have a considerable annual output, which not only meets the domestic market demand, but also exports abroad, increasing the country's foreign exchange income.

They can not only maintain ecological balance, but also predict climate change or disaster: our ancestors linked insect activities with seasons and months, thus summing up the law of insect recording time and recording it in books. For example, in the Book of Songs, in July, there are: "In May, owls move, in June, sand chickens vibrate their feathers, in July, in the wild, in August, and in September, crickets enter my bed." It means: In May, owls began to walk on their legs; In June, the wings of "Sand Chicken" (Weaver Girl) make noise and can fly at the same time; August came under the eaves of residents; I entered the house in September; In October, crickets will drill under the hot kang. Experienced people can predict short-term weather changes in time according to the activities or calls of some insects. For example, many dragonflies fly very low to hunt, which indicates that there will be heavy rain or rainstorm in a few hours. The reason is that the air pressure is low before it rains, some insects fly low, and dragonflies fly low to prey on insects. Ants are also particularly sensitive to climate change. They can predict the weather changes in the next few days. It is said that the meteorological department divides the weather into several different types according to the activities of different ants to predict the weather in the next few days. Sunny day type: Little black ants go out for food, and the nest door is not sealed, which indicates that the weather will be fine within 24 hours. Cloudy day type: (April-June) At 5 o'clock in the afternoon, all kinds of ants still don't return to their nests. Yellow ants built a dam with mud and surrounded the door of the nest. It is estimated that there will be more than four consecutive days of rain after four or five days. Cold air type: big black ants build dams, move houses and seal nests; The little black ant dammed for four days in a row, which indicates that there will be a cold air coming in the future. Heavy rain storm type: (April-September) Big black ants build dams intermittently for more than three days, climbing trees and bamboo; Yellow ants use soil to build dams. The weather forecast shows that there will be temperature rise, humidity rise and air pressure drop, and there will be a rainstorm or heavy rain in the next 48 hours. Drought type: the big black ants move from trees to wet places, transferring the unhatched eggs together, which indicates a long-term drought in the future. Of course, using ants to predict the weather still needs to refer to local meteorological data in order to achieve an accurate degree.

Description of insect hazards:

Insects feed on flowers, stems, leaves, roots, fruits and juices of plants, and plants are harmed: this kind of harm is well known. For example, when we went to the market to buy fruit, we found a small hole in it, which was a masterpiece of insects. Not only destroyed the nutrition of the fruit, but also polluted the fruit. Another example is the melon thrips that harm the flower organs of melons.

Many stored foods, especially meat, cheese, dairy products, flour, etc. , the most vulnerable to insects: insects destroy human crops, often causing crops such as rice, corn, wheat, cotton, rape, sugar cane, potatoes and so on. , known as "smokeless fire", resulting in large areas of forests, orchards and other economic trees dying or seriously reducing production; It destroys building timber and causes serious damage to dams, sleepers, furniture and clothes.

Most of human diseases are spread by insects: pests parasitize the human body, and vector sources, such as trypanosomiasis and anthrax, appear, which can cause livestock to produce vectors. Most human diseases are transmitted by insects, such as cholera transmitted by houseflies, malaria transmitted by Anopheles mosquitoes, dengue fever transmitted by Aedes aegypti or Aedes albopictus, etc.

Biting causes serious injury or death: some insects directly harm human beings, but do not transmit diseases, such as fire ants: when they bite, they cut their powerful jaws into the victim's flesh, uncover the flesh, and then introduce acupuncture. Others, such as adult ants, are another kind of ants that can bite people. Sydney's funnel spider, the most poisonous spider, is violent and quick-witted If bitten, you will die within 15-60 minutes. There is an ant in South America called "devil ant", which mainly kills people with venom. This venom is more poisonous than cobra venom, and people and animals die when bitten. In China, wasps and grubs can also cause allergies, shock or death.