Pyraclostrobin, azoxystrobin, and oxystrobin are all methoxy acrylates, and methoxy acrylate fungicides are a new type of methoxy acrylate antibiotics. Biocides, 6 varieties have been commercialized so far, and at least 7 compounds are under development. They all contain a methoxy acrylate group or are derived from methoxy acrylate.
There are many common features in agricultural applications:
1. Unique mechanism of action. They are all mitochondrial respiratory inhibitors of pathogenic fungi, ie through the cytochromes b and c. Inter-electron transfer inhibits mitochondrial respiration, interferes with cellular energy supply, and causes cells to die, thereby exerting a bactericidal effect. There are many fungicides acting on mitochondrial respiration, but the site of phenoxy acrylate fungicide (cytochrome b) is different from all previous fungicides, so it has been used for sterol inhibitors (such as triazoles) and benzene. Strains which are resistant to amides, dicarboxamides, and benzimidazoles are effective.
2, a broad spectrum of sterilization. It shows excellent activity against almost all fungi (Ascomycetes, Basidiomycetes, Oomycetes and Deuteromycetes), such as powdery mildew, leaf blight, red spot, and net blotchosis in wheat. , black shank, rice blast, sheath blight, as well as downy mildew, blight and other activities have a very good activity, the prevention and control of disease is even more important.
3, has a protective and therapeutic effect, and has a good penetration and systemic effects, can be used in stem and leaf spray, water surface application, treatment of seeds and other means.
4. It is highly selective and safe for crops, people, livestock and beneficial organisms, and has no pollution to the environment.
5. In addition to inhibiting pathogenic bacteria, this class of compounds also has electron transport inhibition effects on certain insects and plants. Therefore, it is possible to develop insecticides and herbicides from phenoxy acrylates. The patent has been made.
Common dosage forms of pyraclostrobin, azoxystrobin and ether oxystrobin:
The trade name of pyraclostrobin is called Kairun, and the name of the ether fungus ester is called Tsuibei, which is all from BASF, Germany.
The azoxystrobin product name is Amisida, and the other is azoxystrobin + difenoconazole, and the product is called Ami, which is Syngenta.
After several years of extensive use worldwide, this kind of fungicide is not only an excellent disease control product, but also can significantly improve fruit quality and increase yield.
Pyraclostrobin and azoxystrobin are effective against most fungal-causing diseases, and the scope of control is broader. Epoxystrobin has a better effect on the disease caused by ascomycetes and basidiomycetes.
For downy mildew, it is recommended to use Plex (made in China), Kelu (cream urea manganese zinc) or Anke (enoylmorpholine) and pyraclostrobin. It can be combined with various diseases. If pyraclostrobin is used for the downy mildew, it may be prevented or the early stage of the disease, and it may not be controlled in the later stage.
At present, pyraclostrobin is used for protection and pre-treatment, and it is really a disease. It is recommended to use silver-Fly (Flavulina + Fluoride).
Kairun has protection and preventive health care. It should be used with caution on any crops under the crop leaves and below the temperature of 15 Â°C.
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