Pymetrozine belongs to the pyridine class of insecticides and is a new non-biocidal insecticide. Developed by Ciba-Geigy of Switzerland (the predecessor of Syngenta, the world's largest plant protection company), it is widely used in the control of aphids and planthoppers in vegetables, wheat, rice, cotton, fruit trees, potatoes and other crops. The toxicity of rat oral LD50 5820mg/kg, compared with sodium chloride LD50 3000mg/kg, is close to half of the toxicity of salt, slightly higher than white sugar LD50 5000-8000mg/kg. The Ministry of Agriculture of China has listed pymetrozine as "the key to promote pollution-free pesticides".
Studies using electro-penetration mapping (EPG) technology have shown that no matter it is drip, feeding or injection test, as soon as aphids or planthoppers come into contact with pymetrozine, they will immediately produce a needle blocking effect, stop feeding immediately, and eventually starve to death , and this process is irreversible. Pyridone has no knockdown activity and does not produce direct toxicity to insects. Therefore, pymetrozine has an excellent function of blocking insect transmission. Pymetrozine has a contact killing effect on pests, and also has systemic activity. In plants, it can be transported both in the xylem and in the phloem, so it can be used as foliar spray and soil treatment. Due to its good conduction properties, the newly grown branches and leaves can also be effectively protected after the stem and leaves are sprayed.
Pymetrozine as an insecticide has the following properties:
Strong selectivity - This product has excellent selectivity, and is almost harmless to some important natural enemies or beneficial insects, such as the natural enemy of cotton bollworm, Ladybug, common lacewing, leafhopper and natural enemy spider of the planthopper family.
        Excellent systemic activity - Foliar tests show that its systemic activity (LC50) is 2-3 times that of pirimicarb and more than 140 times that of cypermethrin.
It can control the resistant strains of pests such as the green peach aphid that are resistant to organophosphorus and carbamate insecticides.
        Scope of application of pymetrozine as a pesticide: vegetables, wheat, rice, cotton, fruit trees. Control range: Aphididae, planthoppers, whiteflies, leafhoppers and other pests, such as cabbage aphid, cotton aphid, wheat aphid, green peach aphid, small green leafhopper, brown planthopper, white-backed planthopper Lice, sweet potato whitefly and greenhouse whitefly, etc.
Therefore, pymetrozine is an environmentally friendly insecticide. Toxicological data show that pymetrozine has very low toxicity to mammals and is safe for most non-target arthropods, birds, fish, and predatory mites. And its metabolites have very little pollution to groundwater, and have excellent performance in integrated prevention and control (IPM). Since the monitoring of rice planthopper's serious resistance to imidacloprid in 2005, many experts have successively put forward suggestions to stop imidacloprid in the control of rice planthopper. In the specific prevention and control work, the provincial plant protection departments are paying attention to controlling the use of imidacloprid to prevent the further development of resistance. At the same time, a number of new varieties of high-efficiency, low-toxicity and low-residue pesticides were screened for demonstration and promotion. Among them, the Jiangsu Provincial Plant Protection Station screened the new pesticide pymetrozine with special effects in 2006. The annual promotion area is more than 400,000 mu. From 2007 to the present, the promotion area has reached 5 million mu. At present, pyridine has been used in a large area in the country and has a tendency to replace imidacloprid.
The production technology of pyranone has been monopolized by large foreign companies for a long time, and China has long relied on imports and the price is high. In order to break the monopoly of large foreign companies, it is imperative to develop the production technology of pyrazolone with independent intellectual property rights.

Pymetrozine is a highly selective contact insecticide with good systemic activity. In plants, it can be transported in both the xylem and the phloem; therefore, it can be used as a foliar spray or soil treatment. Due to its good transport characteristics, the newly grown branches and leaves can also be effectively protected after the stems and leaves are sprayed.

Uses: Pymetrozine is a non-killing new high-efficiency low-toxic insecticide. Its preparation can be used to control most of the homopteran pests, especially the Aphididae, Whiteflies, Leafhoppers and Planthoppers. It is suitable for vegetables. , Ornamental plants, hops, deciduous fruit trees, citrus, rice, wheat, cotton and a variety of field crops.

Pymetrozine belongs to the pyridine or triazone type insecticides, and is a brand new non-biocidal insecticide. The product has excellent control effect on piercing and sucking mouthparts pests of various crops. As soon as aphids or planthoppers come into contact with pymetrozine, the needle blocking effect will occur immediately, and the feeding will be stopped immediately, and eventually starvation will die. This process is irreversible. Pymetrozine has no knockdown activity and does not produce direct toxicity to insects. Therefore, pymetrozine has an excellent function of blocking insect transmission. Pymetrozine is also an environmentally friendly insecticide. Toxicological data shows that pymetrozine is very toxic to mammals and is safe for most non-target arthropods, birds, fish, and natural enemies of predatory mites.

As a new type of insecticide, pymetrozine has many advantages, such as low toxicity, environmental protection, greenness, unique mechanism of action, and long lasting effect, making it one of the plant protection experts. Pymetrozine can be used to control most homopteran pests. Especially the Aphididae, Whiteflies, Leafhoppers and Planthoppers have an effective period of more than 20 days. The mechanism of action of the drug is the adult. After the nymphs come into contact with the drug, they will have a stylus blocking effect, stop feeding and become hungry. And die instead of touching the stomach poison. The mortality rate is not high 1-2 days after the drug, and it takes 2 days to gradually reach the peak of death, and some individuals even die in 5-7 days.

Recently, the occurrence of rice planthoppers in some villages and towns in our county has been serious. As one of the pesticides, pymetrozine has a gradual increase in the prevention and control of planthoppers, but some people do not understand the mechanism of action. The mortality rate is not high, I mistakenly believe that the drug is ineffective, and eager to switch to other drugs for blind retreatment, which increases costs and takes man-hours and causes unnecessary losses. Therefore, when using pymetrozine to control rice planthoppers, it is recommended to use 24 Grams (3 packs) 25% pymetrozine suspension + 25% MTMC EC 150g or +25% Fenobucarb EC 150g and other good medicaments. The amount of water should not be less than 50 kg, and spray evenly during the peak period of nymphs o achieve long-term effect and reduce the cost of medication.