Wheat seed dressing agent for preventing and treating wheat basal stem rot

The invention belongs to the technical field of pesticides, and particularly relates to a wheat seed dressing agent for preventing and treating wheat basal stem rot. The effective components of the bactericidal composition are formed by compounding the physcion and the fludioxonil or the tebuconazole. The physcion and fludioxonil or tebuconazole are combined and compounded, the compounded composition has a synergistic effect on pathogenic bacteria of the wheat stem rot within a certain mass ratio range, the prevention and treatment effect on the wheat stem rot can be improved, the application dosage of a pesticide is reduced, and the prevention and treatment cost of the wheat stem rot is reduced. The control cost, environmental pollution, pesticide residues and the like are reduced. Besides, after the physcion and fludioxonil or tebuconazole are combined and compounded, components such as compound sodium nitrophenolate, a surfactant, a coloring agent and filler are added to prepare the seed-dressing agent, so