At present, with the use of chemical pesticides, the problem of pesticide residues has increasingly attracted people's attention, and people's voices for pollution-free vegetables are getting higher and higher. Growing green agriculture has become an inevitable trend.
The pesticides that can be used in the production of pollution-free vegetables have the following categories: biological pesticides . Biological pesticides have special effects on pests and are highly safe pesticides. They are characterized by high efficiency, low toxicity, no residue and slow resistance. Such as bacterial insecticides BT, avermectin, etc.; fungal insecticides; insect virus insecticides and insect pheromones. Modern concept of plant source pesticides. That is, the pest extract has plant extracts that refuse to eat, repel, hinder development, and interfere with specific infestation such as reproduction.
Insect development regulator. It can hinder pests from peeling, interfere with development and control, and is harmless to humans and high-grade animals. It has little impact on natural enemies and is safe for the situation. For example, it is widely used, such as Taibao, diflubenzuron, and chlorpyrifos. Such as chlortetracycline, rice full has also begun to promote.
Efficient, fast-acting, low-residue agent. For example, pyrethroids, especially new varieties of pesticides, such as tetrabromoester to control vegetable pests, the dilution concentration can reach 8000 ~ 10000 times, and low residue, short distance of safe distance.
New insecticides. The structure and dyeing mechanism of these insecticides are weird, and the comparative pests are highly efficient, such as imidacloprid, which has been widely used. 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.
New antibiotic preparations. For example, the multi-sporin-resistant vegetable pests are highly efficient and quick-acting, but they are safe for humans and high-grade animals, and have a short safe distance, which is suitable for use in vegetable fields.
Efficient, fast-acting, highly selective agent. For example, carbamate anti-Polygon is only effective for mites, but it is not dangerous to other organisms, and has a short residual period. It is safe for crops and natural enemies. It is an ideal agent for producing pollution-free vegetables and maintaining the ecological balance of vegetable fields.
In the application of pesticides produced from pollution-free vegetables, it is necessary to be targeted. In the full function and use of pesticides appreciate style essentially according to the kind of pest, the appropriate choice of the type or pesticide formulations.
It is necessary to use the medicine at an appropriate time. In accordance with the discipline of pests and diseases, we must strictly grasp the era of optimal prevention and control, and do so when ordered. It is necessary to prevent and cure diseases in the early stage of the disease, to control the center of the disease, to prevent its growth and growth, and to prevent and control the occurrence of disease and disease. It is difficult to prevent and cure the disease; for pests, it is required to “treat early, cure small, cure” and pests. There is a lot of difference in reaching the end of the old age. Different pesticides have different functions, and the control period is also different. Biological pesticides are slower to infiltrate and should be used 2 to 3 days earlier than chemical pesticides.
Use medicine scientifically. Pay attention to the alternate rotation of pesticides using divergent digestive mechanism, which can not be permanently singularized, prevent the occurrence of resistance of pathogenic bacteria or pests, and facilitate the prevention and treatment of the linked agents and the service life. In the early stage of vegetable development, high-efficiency and low-toxic chemical pesticides and biological pesticides were mainly mixed or alternately used, and bio-pesticides were mainly used in the later stage of development. The use of pesticides should promote low-volume spray methods.
Select the correct spray point or location. At the time of application, according to the occurrence characteristics of different pests and diseases in different times, the divergent parts of the plants were determined as targets, and targeted application was carried out. Reduce the use of drugs by real-time control of the occurrence of pests and diseases, reducing the number of pathogens and reducing the number of insects. For example, the occurrence of downy mildew is caused by the growth of the lower leaves. The early prevention of downy mildew is not the focus of the leaves, which can alleviate the upper leaves. Insects, whitefly and other pests inhabit the back of young leaves, which must be averaged when spraying, with the spray head up and the focus on the back of the spray.

Reasonably compound the agent. The use of assimilation drug regimen achieves the goal of administering a variety of pests and diseases at one time. However, the pesticide compounding should be based on the connection of the original ingredients or synergistic effects, without adding toxicity to humans and animals and having excellent physical properties. Generally, neutral pesticides can be mixed; neutral pesticides and acidic pesticides can be mixed; acidic pesticides can be mixed; alkaline pesticides cannot be mixed with other pesticides; microbial pesticides cannot be combined with fungicides and systemic pesticides. Mixed.
It is necessary to carry out the safe distance of pesticides according to the exact day. The safe distance of pyrethroid pesticides is 5-7 days, the organophosphorus pesticides are 7~14 days, the fungicides are chlorothalonil, daisen zinc and carbendazim for more than 14 days, and the rest are 7-10 days. The pesticide compounding agent performs the safe distance of the most useful component in the residue.

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