NO.1 The difference between pesticides
There are many types of pesticides, which can be mainly divided into insecticides, acaricides, rodenticides, nematodes, molluscicides, fungicides, herbicides, plant growth regulators, etc. according to their uses;
According to the source of raw materials, pesticides can be divided into mineral pesticides (inorganic pesticides), biogenic pesticides (natural organic compounds, microorganisms, antibiotics, etc.), and chemically synthesized pesticides;
According to their chemical structures, there are mainly organochlorine, organophosphorus, organonitrogen, organosulfur, carbamate, pyrethroid, amide compounds, urea compounds, ether compounds, phenolic compounds, phenoxycarboxylic acids, amidines, triazoles, heterocycles, benzoic acids, organometallic compounds, etc. They are all organic synthetic pesticides;
According to the processing dosage form, it can be divided into powder, wettable powder, emulsion, lotion, cream, paste, colloid, fumigant, smoke agent, smoke agent, granule, particle agent and oil agent.
NO.2 How to use pesticides
If pests are causing trouble in the field, targeted insecticides and acaricides can be selected according to the corresponding situation
Insecticides and acaricides are also classified into the following types based on their insecticidal methods
① Gastric toxin: The drug enters the body through the insect's mouth and works through the digestive system to cause the insect to be poisoned and die. For example, dichlorvos is a typical stomach poison, and its liquid is sprayed onto vegetable leaves. The larvae of cabbage caterpillars and diamondback moths chew on the leaves and ingest the drug, which can cause poisoning and death.
② Contact killing agent: The agent enters the body through the insect's epidermis and exerts its effect, causing the insect to be poisoned and die. Most pyrethroid insecticides, as well as many organophosphate and carbamate insecticides, have strong contact killing effects, which can be achieved by spraying the insecticide onto the insect body.
③ Fumigant: Some chemicals can vaporize into toxic gases or produce toxic gases through chemical reactions, which enter the insect's body through its valves and respiratory system to exert their effects and cause the insect's body to be poisoned and die. The fumigation effect of organophosphate insecticide dichlorvos is very strong, which can form a certain concentration in a closed space and kill insects in that space.
④ Inhalation agent: After application, the drug is absorbed by the plant through the leaves, roots, and stems, and then transported to other parts of the plant, such as through transpiration flow from bottom to top, to exert its effects through the active ingredients themselves or through metabolism in the plant as more biologically active substances. Internal suction agents are mainly used to prevent and control piercing sucking mouthparts pests, such as oxyfruit, which can control aphids.
These can all be selected according to the form of damage caused by insects in the field.
The pesticide is applied to plants or soil, absorbed by the roots, stems, and leaves of the plant, and transmitted within the plant, ultimately killing weed plants. Glyphosate has a strong internal absorption and conduction effect, which can conduct both apical and basal directions. When applied to weed plants, it can kill their aboveground parts as well as their underground roots, stems, and other underground parts. Therefore, it can prevent and control perennial perennial perennial perennial weeds.
For other issues, targeted purchases can be made based on the type of pesticide after examining the specific problem.
NO.3 The role of pesticides
The occurrence of pests, diseases, weeds, and rodents in crops is a natural phenomenon. When the degree of occurrence of pests, diseases, and weeds exceeds the economic threshold, intervention and prevention must be carried out, otherwise it will cause loss of crop yield or even complete crop failure.
Integrated prevention and control is an effective and sustainable approach to managing pests, diseases, weeds, and rodents. However, in practical production, pesticides are still one of the most important prevention and control measures. Therefore, pesticides are an important means and tool to protect crops and reduce yield losses.
Currently, there are 790 million people worldwide who suffer from chronic hunger, including 160 million children under the age of 5, and over a billion people suffering from various forms of malnutrition. Addressing food security remains an important issue for humanity.
To this end, the Food and Agriculture Organization of the United Nations (FAO) has developed five major strategies to address hunger, poverty, and sustainable agricultural development issues, with the first strategy being "eradicating hunger", in which pesticides will also play an important role.
The role of pesticides is not only to reduce yield losses, but the use of herbicides greatly improves weed control efficiency and effectively liberates agricultural productivity; The use of plant growth regulators can promote the improvement of horticultural characteristics and commercial value of agricultural products, as well as the development of agricultural mechanization, such as mechanized cotton harvesting.
