Prevention and treatment agent for hylocereus undatus canker

The invention relates to the technical field of prevention and treatment of hylocereus undatus canker, in particular to a prevention and treatment agent for hylocereus undatus canker. The prevention and treatment agent is prepared by the following method: (1) cultivating a canker bacteria liquid: soaking hylocereus undatus branches suffering from the canker into the canker bacteria culture liquid,and performing cultivation at the temperature of 30-35 DEG C; (2) cultivating anti-canker bacteria: adding a beneficial bacteria solution with the mass of 0.5-1.0 time that of the branches into a product obtained in the step (1), and performing cultivation at the temperature of 25-35 DEG C; (3) performing killing treatment on harmful bacteria: respectively irradiating the substances obtained in the step (2) by using blue light and green light for 25 min in sequence; and (4) adding soapberry powder and shiitake mushroom powder into a product obtained in the step (2), and carrying out ultrasonic treatment. The preventi