To provide a method for controlling pests by natural enemy organisms in greenhouse culture which exhibits superior control effects, with respect to pest organisms.

The method for controlling pests by natural enemy organisms in greenhouse culture comprises (1) a first process for controlling the density of pests living in a greenhouse by an adhesive trap material during a period, in which the temperature in the greenhouse is a temperature at which the natural enemy organisms are hard to breed, and (2) a second process for controlling the density of pests living in the greenhouse by freely keeping natural enemy organisms, in the absence of the adhesive trap material during a period in which the temperature in the greenhouse is a temperature at which the natural enemy organisms are easy to breed.