PROBLEM TO BE SOLVED: To provide an insect pest control apparatus that suppresses coming flying insect pests and surely reduces plant damages by nocturnally active insect pests even in a time zone when activity of nocturnal insect pest is active.SOLUTION: The insect pest control apparatus 15 is equipped with a light source 11 for irradiation with a light of at least a part of wavelengths of approximately 470-580 nm wavelengths and controls output of light irradiated from the light source 11 on the base of infestation degree of insect pests 3 or activity degree of insect pests 3.COPYRIGHT: (C)2011,JPO&INPIT【課題】夜行性害虫の活動が活発な時間帯においても、飛来する害虫を抑制して、夜行性害虫による植物の被害を確実に低減することができる害虫防除装置を提供する。【解決手段】略470~580nmの波長域の少なくとも一部の波長域の光を照射する光源11を備え、制御装置15が、害虫3の発生度合い、または害虫3の活動度合いに基づいて、光源11から照射される光の出力を制御する。【選択図】図1