Ecological agriculture disease and pest prevention and control device and prevention and control method

The invention discloses an ecological agriculture disease and pest prevention and control device and prevention and control method, and belongs to the technical field of agricultural disease and pest prevention and control. The ecological agriculture disease and pest prevention and control device comprises a support part, a pesticide spraying irrigation part, light insect trapping devices and a root pesticide injection device, wherein the support part comprises a plurality of stand columns, cross rods are movably arranged between the stand columns, and the light insect trapping devices are arranged on the upper parts of the stand columns; the pesticide spraying irrigation part comprises an irrigation spraying head, the irrigation spraying head is connected with a main pipeline, the main pipeline communicates with a liquid storage tank, the liquid storage tank is connected with a pesticide mixing device, the pesticide mixing device comprises a water tank and a pesticide tank, and the capacity of the water tank