Polyoxin B ——Broad spectrum antibiotic bactericides have the function of internal absorption and conduction.

Polyoxin B is a low toxicity fungicide. It is a metabolite produced by Streptomyces aureus. It is a safe pesticide with high efficiency, low toxicity and no environmental pollution. Therefore, it is widely used in crops. Characteristics of pesticide bactericide Polyoxin B is a broad-spectrum antibiotic bactericide with good internal absorption and conduction. Its mechanism is to interfere with chitin biosynthesis in bacterial cell wall. After the germ tube and mycelium contact with the drug, they expand, rupture and overflow the cell contents locally, but can not develop normally, resulting in death. It also has the effect of inhibiting spore production and disease spot expansion. Polyoxin B is a mixture containing 14 different homologues from a to N14. It is a peptide pyrimidine nucleotide antibiotic. Polyoxin B is easily soluble in water and insoluble in organic solvents such as methanol and acetone. It is stable to ultraviolet and in acidic and neutral solutions, unstable in alkaline solutions and stable in storage at room temperature. Low toxicity to higher animals, fish and bees.

Polyoxin B is a broad-spectrum antibiotic bactericide, which has the function of internal absorption and conduction. Its mechanism is to interfere with the biosynthesis of cell wall chitosan. Some fungi of Ascomycetes, basidiomycetes and hemimycetes, which use chitosan as the matrix to form the cell wall, will locally expand, rupture and overflow the cell contents after contacting the germ tube and mycelium with the drug, resulting in death. It is mainly used to control wheat powdery mildew, ginseng black spot, tobacco scab, cucumber downy mildew, Melon Fusarium wilt, rice sheath blight, apple spot defoliation, strawberry and grape gray mold, forest sheath blight and other fungal diseases.

It has a good control effect on many fungal diseases, such as wheat powdery mildew, tobacco scab, cucumber downy mildew, Melon Wilt, ginseng leaf black spot, sugar beet brown spot, rice sheath blight, early apple defoliation, tree shoot blight, pear black spot and so on. It can not only cure diseases, but also stimulate plant growth. For example, the control effect of rice sheath blight can reach 80%, the rice grows vigorously, the seed setting rate increases by about 6% compared with the control, and the average yield per mu increases by about 10%.