An object of the present invention is to provide a method for controlling marching insects that can securely and easily obtain a sufficient control effect. A method for controlling marching insects, wherein nano-bubble water is applied to a plant body.本發明的課題在於提供一種可安全且簡易地獲得充分的防治效果的行軍蟲的防治方法。一種行軍蟲的防治方法,其中將奈米氣泡水施用於植物體。