A pest control system, comprising: a detection beam emitter for emitting a detection beam for detecting said pests; a reflected signal receptor for receiving a reflected signal reflected from an object irradiated with said detection beam; a destruction beam emitter for emitting said destruction beam to said pests upon detecting said pests; a targeting means for aiming a destruction beam from destruction beam emitter at said pests for destroying said pests upon detecting said pests; a control device having a storage unit comprising a pest control program storage means and signature data storage means which stores signature data including a signature of target pests and one or more signature data of useful organisms, crops, damaged pests by said destruction beam and symptoms of infestation, and an arithmetic processing unit comprising a pest detecting means for detecting said pests by comparing a reflected data obtained from said reflected signal with the signature data stored in the signature data storage means; characterized in that said pest control system comprises a patrol device mounted on a self-propelled robot for patrolling areas of crop plants to be controlling pests and controlled by the arithmetic processing unit of the control device, said patrol device comprises said detection beam emitter, said reflected signal receptor and said destruction beam emitter, in that said reflected signal receptor is a full/multispectral imaging camera that films the plant and the ground, and in that said pest control system further comprises a low intensity guiding laser, in that the targeting means is configured to move the focus of the low intensity guiding laser filmed by the full/multispectral imaging camera from the current focus of the guiding laser up to coincide with the target pest filmed by the camera. a detection beam emitter for emitting a detection beam for detecting said pests; a reflected signal receptor for receiving a reflected signal reflected from an object irradiated with said detection beam; a destruction beam emitter for emitting said destruction beam to said pests upon detecting said pests; a targeting means for aiming a destruction beam from destruction beam emitter at said pests for destroying said pests upon detecting said pests; a control device having a storage unit comprising a pest control program storage means and signature data storage means which stores signature data including a signature of target pests and one or more signature data of useful organisms, crops, damaged pests by said destruction beam and symptoms of infestation, and an arithmetic processing unit comprising a pest detecting means for detecting said pests by comparing a reflected data obtained from said reflected signal with the signature data stored in the signature data storage means; a storage unit comprising a pest control program storage means and signature data storage means which stores signature data including a signature of target pests and one or more signature data of useful organisms, crops, damaged pests by said destruction beam and symptoms of infestation, and an arithmetic processing unit comprising a pest detecting means for detecting said pests by comparing a reflected data obtained from said reflected signal with the signature data stored in the signature data storage means; characterized in that said pest control system comprises a patrol device mounted on a self-propelled robot for patrolling areas of crop plants to be controlling pests and controlled by the arithmetic processing unit of the control device, said patrol device comprises said detection beam emitter, said reflected signal receptor and said destruction beam emitter, in that said reflected signal receptor is a full/multispectral imaging camera that films the plant and the ground, and in that said pest control system further comprises a low intensity guiding laser, in that the targeting means is configured to move the focus of the low intensity guiding laser filmed by the full/multispectral imaging camera from the current focus of the guiding laser up to coincide with the target pest filmed by the camera.