Insect attraction and trapping efficiency is increased in an insect trap that uses an opaque cylinder, and fluctuation in and interruption of the rotation of the opaque cylinder, which causes a decreased or hindered trapping function, are resolved. The trap is provided with an opaque cylinder that rotates around a shaft, blades that stand upright from the outer circumferential surface of said opaque cylinder, flanges at both ends of the opaque cylinder, and a curved surface, which is equipped with an insect killing or immobilizing means and is disposed at the outer margin of said opaque cylinder a specified distance from the rotational path of the leading edges of the blades. The outer circumferential surface of the opaque cylinder, the blades, the flanges, and the curved surface are configured to form a closed insect trap space when the opaque cylinder is rotated. A light source is provided inside the opaque cylinder and the opaque cylinder is configured to include at least one transparent area for light to attract insects. Also provided are an electric motor that turns the opaque cylinder, a shaft position sensor, a means to reverse the direction of rotation of the electric motor if a shift is detected in the shaft position, a means to return the rotation to the specified direction, and a component to detach from the opaque cylinder any insects or debris exceeding a specified size that would cause a shift in the position of the shaft of said electric motor.本發明可提高使用遮光性筒體之捕蟲機之蟲子誘捕效率,以消除因遮光性筒體之旋轉變動或停止而導致捕蟲功能降低或故障。本發明之補蟲機設置有:繞軸旋轉之遮光性筒體;自該遮光性筒體外周面豎立之擋板;設置於遮光性筒體兩端之凸緣;與以既定間隔隔開擋板前端之旋轉軌跡之遮光性筒體外緣區域,具備殺蟲或困蟲裝置之彎曲面,藉此若遮光性筒體旋轉,則可藉由該遮光性筒體外周面、擋板、凸緣及彎曲面而形成捕蟲閉鎖空間。於遮光性筒體內設置光源,且遮光性筒體上包含至少1個誘蟲光透過區域。其構造為設有:使遮光性筒體旋轉之電動機;軸位置感測器;若檢測出軸位置之偏移則使電動機逆向旋轉之手段;使其恢復成既定旋轉之手段;及使該電動機之軸位置產生偏移以使超過既定尺寸的蟲子或異物離開遮光性筒體之構件。1‧‧‧捕蟲機10b‧‧‧旋轉軸13‧‧‧誘蟲光源18‧‧‧包覆體20‧‧‧彎曲面21‧‧‧遠紅外線照射構件22‧‧‧更換用蓋23‧‧‧電動機24‧‧‧支架25‧‧‧收容箱28‧‧‧軸位置感測器29‧‧‧異物去除構件30‧‧‧誘導斜面
