Recently, with the large-scale use of chemical pesticides, the problem of pesticide residues has attracted people's attention. People's voices on pollution-free vegetables are getting higher and higher. In order to solve the problem of excessive pesticide residues in vegetables from the source, non-chemicals are used to control pests and diseases. At the same time, how to scientifically and rationally select chemical pesticides, control pesticide residues below the allowable level, and develop green agriculture has become an inevitable trend.
I. Requirements for the production of pollution-free vegetables for pesticides
Combined with the characteristics of vegetable cultivation and pest occurrence, the requirements for the use of pesticides in the production of pollution-free vegetables are:
1. Efficient and quick-acting.
2. safety. Including low toxicity, low residue, the agent can be quickly digested in nature (such as hydrolysis, photolysis or microbial decomposition), does not pollute the environment, and also includes less damage to natural enemies, pollinating insects, etc., and does not cause phytotoxicity to vegetables.
3. Widely popular. It is not only effective for many types of pests, but also effective for pests.
4. Selective. That is, an agent that has high selectivity for certain (type) pests, such as anti-Polygon.
5. Not resistant to resistance or cross-resistance.
6. The structure is novel and the mechanism of action is unique.
The medicament having the above-mentioned superiority can fully exert the function of the medicament in the comprehensive treatment of vegetable pests, and can also ensure that the vegetables produced meet the requirements of "no pollution".
2. Pesticide categories applicable to the production of pollution-free vegetables
1. Biological pesticides. Biological pesticides have special effects on pests and are highly safe. They are highly effective, low-toxic, non-residue and slow in drug resistance. Such as bacterial insecticide Bt (Bacillus thuringiensis microbial insecticide), avermectin, smoke. Alkali plant insecticides; fungal insecticides (B. albicans); insect virus insecticides and insect pheromones (such as sex attractants).
2. Modern concept of plant source pesticides. That is, plant extracts (such as azadirachtin and chuanxiong) that have anti-feeding, repelling, hindering development, and disturbing reproductive effects.
3. Insect growth regulators can play a controlling role by hindering the peeling of pests and disturbing development. They are harmless to humans and higher animals, have little impact on natural enemies, and are safe for the environment, such as yinbao, diflubenzuron, and chlorpyrifos. New varieties such as chlortetracycline and rice are also being promoted.
4. Efficient and fast. Low-residue agents such as pyrethroids, especially some new varieties, such as tetrabromo-ester, can reduce the concentration of vegetable pests by 8000-10000 times, with low residue and short safety interval.
5. New insecticides. The insecticide has a unique structure and mechanism of action, and is highly effective against resistant pests, such as imidacloprid. Another example is Akthai, a new generation of strong systemic, low-toxic, high-efficiency insecticides. It has special effects in controlling whitefly, and the dilution concentration is increased by 5000 times.
6. New antibiotic preparations. For example, spinosad-resistant vegetable pests are highly efficient and quick-acting, but they are safe for humans and higher animals, and have a short safety interval, which is very suitable for use in vegetable fields.
7. Efficient, fast-acting, highly selective agent. For example, carbamate anti-Polygon is only highly effective against aphids (with triple action of contact, stomach poisoning, and fumigation), and has no harm to other organisms, and has a short residual period. It is safe for crops and natural enemies, and produces pollution-free vegetables. The ideal agent for maintaining the ecological balance of vegetable fields.
I. Requirements for the production of pollution-free vegetables for pesticides
Combined with the characteristics of vegetable cultivation and pest occurrence, the requirements for the use of pesticides in the production of pollution-free vegetables are:
1. Efficient and quick-acting.
2. safety. Including low toxicity, low residue, the agent can be quickly digested in nature (such as hydrolysis, photolysis or microbial decomposition), does not pollute the environment, and also includes less damage to natural enemies, pollinating insects, etc., and does not cause phytotoxicity to vegetables.
3. Widely popular. It is not only effective for many types of pests, but also effective for pests.
4. Selective. That is, an agent that has high selectivity for certain (type) pests, such as anti-Polygon.
5. Not resistant to resistance or cross-resistance.
6. The structure is novel and the mechanism of action is unique.
The medicament having the above-mentioned superiority can fully exert the function of the medicament in the comprehensive treatment of vegetable pests, and can also ensure that the vegetables produced meet the requirements of "no pollution".
2. Pesticide categories applicable to the production of pollution-free vegetables
1. Biological pesticides. Biological pesticides have special effects on pests and are highly safe. They are highly effective, low-toxic, non-residue and slow in drug resistance. Such as bacterial insecticide Bt (Bacillus thuringiensis microbial insecticide), avermectin, smoke. Alkali plant insecticides; fungal insecticides (B. albicans); insect virus insecticides and insect pheromones (such as sex attractants).
2. Modern concept of plant source pesticides. That is, plant extracts (such as azadirachtin and chuanxiong) that have anti-feeding, repelling, hindering development, and disturbing reproductive effects.
3. Insect growth regulators can play a controlling role by hindering the peeling of pests and disturbing development. They are harmless to humans and higher animals, have little impact on natural enemies, and are safe for the environment, such as yinbao, diflubenzuron, and chlorpyrifos. New varieties such as chlortetracycline and rice are also being promoted.
4. Efficient and fast. Low-residue agents such as pyrethroids, especially some new varieties, such as tetrabromo-ester, can reduce the concentration of vegetable pests by 8000-10000 times, with low residue and short safety interval.
5. New insecticides. The insecticide has a unique structure and mechanism of action, and is highly effective against resistant pests, such as imidacloprid. Another example is Akthai, a new generation of strong systemic, low-toxic, high-efficiency insecticides. It has special effects in controlling whitefly, and the dilution concentration is increased by 5000 times.
6. New antibiotic preparations. For example, spinosad-resistant vegetable pests are highly efficient and quick-acting, but they are safe for humans and higher animals, and have a short safety interval, which is very suitable for use in vegetable fields.
7. Efficient, fast-acting, highly selective agent. For example, carbamate anti-Polygon is only highly effective against aphids (with triple action of contact, stomach poisoning, and fumigation), and has no harm to other organisms, and has a short residual period. It is safe for crops and natural enemies, and produces pollution-free vegetables. The ideal agent for maintaining the ecological balance of vegetable fields.
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The male and female Screws are mainly used in computer, circuit board and other industries. When one end is screwed into the locked object, the hexagonal column is exposed, which can fix or isolate other objects. The male and female screws are assembled on the computer host. The external thread connects the main board inside the host. The internal thread separates the main board from the sheet metal shell. The terminal line to be connected is connected with a screw from the internal thread of the sheet metal shell and the male and female copper column.
Main specifications
The main specifications of male and female screws are m3, M4, M5, M6, M8, m10and so on. Their hexagonal columns are 5, 6, 8, 10, 12, 15mm and so on, among which m3 series is the most suitable. In addition to copper, there are stainless steel, fast cutting steel and so on.
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