Provided is a control device that can surely control pests in a cultivation room. A spray means provided with a nozzle for spraying a chemical solution containing a pest control agent into a plant cultivation room is provided, and the nozzle has a droplet being sprayed of 100 μm or less and an average particle size of 10 μm or more and 30 μm or less, and sprayed from the nozzle Is arranged such that the nozzle is evenly filled in the entire area of the plant cultivation chamber, and spraying from the nozzle is performed so that the humidity in the plant cultivation chamber is 90% or more and 100% or less It has.栽培室の病害虫を確実に駆除できる防除装置を提供する。病害虫防除剤を含む薬液を植物栽培室内に噴霧するノズルを付設した噴霧手段を備え、前記ノズルは噴霧中の液滴が１００μｍ以下且つ平均粒径が１０μｍ以上３０μｍ以下であり、該ノズルからの噴霧が該植物栽培室内の全域に均等に充満されるように前記ノズルを配置し、かつ、該植物栽培室内部の湿度が９０％以上１００％以下になるように前記ノズルからの噴霧を行う制御装置を備えている。
