The present invention relates to a compound derived from a rice straw extract and use thereof for inhibiting growth of blue-green algae. The compound has an excellent effect of inhibiting growth of blue-green algae and thus can be advantageously used for inhibiting growth of blue-green algae, which inhibit the growth of rice. The compound is represented by Chemical formula 1 wherein R1, R2, and R3 are independently hydrogen, hydroxy, C1-C6 akly, or C1-C6 alkoxy.COPYRIGHT KIPO 2015본 발명은 신규한 볏짚 추출물 유래 화합물, 이의 남조류 생장 억제 용도에 관한 것으로, 본 발명의 화합물은 남조류 생장 억제 효과가 우수하여, 벼의 생육을 저해하는 남조류의 생장 저해 용도로 유용하게 사용될 수 있다.