Infestation of pests affects an important factor in the agricultural production process. A large number of pests not only reduce food production, but also use a large amount of pesticides, which has a great impact on soil and ecological environment. Safe and effective pest control is a subject that scientists have been researching in recent years. . Today we talk about several physical methods for pest control.
Using insect traps to trap and kill pests is an effective method of extermination because all insects will respond to certain light waves. This is the application of insect phototaxis. Insects also have chemotaxis, and some insects are rushing to some chemical substances. For example, some larvae like to be sweet and sweet, some have larvae, and all insects respond to sex hormones emitted by the opposite sex.
The use of sex attractants to treat pests is another direction for high-tech pest control. In this regard, progress at home and abroad is fast. In addition, it is also a good idea to treat males with rays to cause infertility and release them to mate with females. China once released 150,000 heads of sterile mandarin orange males in a 30-hectare orange orchard in a certain place in Guizhou, which reduced the hazard rate of the fruit fly from 7.5% to 0.005%. Although there are many kinds of insect pests, insects have fatal weaknesses. If the chitinous exoskeleton is slightly damaged, body fluids will quickly evaporate, and water loss will be up to 10%. Scientists in the United States studied the diatomite in the formation and discovered that the Cretaceous unicellular algae fossils are all empty shells. The hard cell wall protrudes like a microscopic blade, and when they are applied to the insect's body wall, they will A trace of the naked eye was not visible, and the insect died without losing water. Scientists also found that when diatom particles enter the body, they not only absorb water 3 times their own weight, but also cause scratches in various organ systems, all of which are fatal for insects. Therefore, insects swallowing diatomaceous earth powder will cause metabolic disorders, eventually leading to the death of insects. Based on the above research, a pesticide company in the United States has made diatomite a physical pesticide called PG.
Trial data show that diatom fossil pesticides have a wide spectrum, high efficiency, non-toxic, labor-saving advantages. It has a killing effect on pests in all environments, such as farmland, gardens, nurseries, corrals, granaries, warehouses, offices, and houses. Because it is a physical killer, the resistance of pests does not exist. In the granary, 3.2 to 4.5 kilograms of diatom powder per ton of grain is mixed. After a year, there are only 15 grain pests in the warehouse, and there are 16944 pests in the comparison bin; 10 grams of diatoms per square meter are used to kill insects. The agent was sprayed on the back of the crop after the rain and the dew. After a few days, most of the pest's adults and larvae died.
Diatom powder is very safe for humans and animals, and contains 14 trace elements, some trace elements such as titanium, vanadium is not in the food, such as 2% of the mix of feed, can make livestock fur bright, strong bones, but also reduce Fecal odor. China's Yunnan, Sichuan and other provinces have a large amount of diatomaceous earth stored. The introduction of this technology to produce a large number of such diatom pesticides in China is of great significance to changing the structure of pesticides in China and reducing pesticide pollution.
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