Method for protecting big greening tree against coptotermes formosanus

The invention relates to a method for protecting a big greening tree against coptotermes formosanus. The method for protecting the big greening tree against the coptotermes formosanus comprises the steps that a hole is drilled in the trunk of the big greening tree by means of a drill bit with the length ranging from 30 cm to 50 cm and the diameter being 8.0 mm, the position where the hole is drilled is below an eclosion hole and is 15 cm-20 cm away from the ground, and the drill bit drills in the pith at the inclination angle of 35 degrees, wherein the depth of the drilled hole is larger than the radius of the trunk of the big greening tree; wood chips are removed after the hole is drilled, insecticide is sprayed into the drilled hole by means of a capsule duster, and the orifice of the drilled hole is blocked with waste paper or soil for three to seven days after the insecticide is sprayed into the drilled hole. The method for protecting the big greening tree against the coptotermes formosanus is simple, easy to implement, remarkable in control effect, low in cost and high in benefit, and the coptotermes formosanus control effect can reach over 95%; however, the coptotermes formosanus control effect of a traditional control method can only reach about 80%.