Provided is a composition for preventing pollen diffusion and promoting early fallage of roadside trees which is directly injected into the trees or rhizosphere soil of the roadside trees, and contains 3-indolylacetic acid, quercetin, abscisic acid, 2-chloroethyl phosphonic acid, and gibberellin as active ingredients for promoting early fallage. Also provided are a supply device, and a method for preventing pollen diffusion and promoting early fallage of roadside trees using the same.COPYRIGHT KIPO 2017본 발명은 가로수의 근권토양 또는 수목에 직접 주입되며, 조기낙과를 촉진하기 위한 3-인돌아세트산, 퀘르세틴, 아브시스산, 2-클로로에틸포스포린산, 및 지베렐린을 활성성분으로 함유하는 가로수의 조기낙과촉진 및 화분날림방지용 조성물, 공급장치 및 이를 이용한 조기낙과촉진 및 화분날림방지방법을 제공한다.
