An object of the present invention is to provide a method for controlling whiteflies which can obtain a high control effect without using a chemical agent. A method for controlling whiteflies, wherein nano-bubble water is applied to plants.本發明的課題在於提供一種即便不使用化學藥劑亦可獲得高防治效果的粉蝨類的防治方法。一種粉蝨類的防治方法,其中將奈米氣泡水施用於植物體。