柑桔上应用2,4-D保花保果有良好效果,但也存在不少问题。若使用不当,则往往造成药害,反而加剧落花落果,导致减产。近年来,赤霉素供应紧张,且价格昂贵,而2,4-D价廉易得。因此笔者认为,2,4-D只要使用得当,仍不失为一种经济有效的保果剂。根据多年实践,特提出应用2,4-D的以下注意事项: Citrus application of 2,4-D flower Paul fruit has a good effect, but there are also many problems. If used improperly, they often cause injury, but aggravate disastrous consequences, resulting in reduced production. In recent years, gibberellic acid supply is tight and expensive, while 2,4-D is cheap and readily available. Therefore, I believe that, 2,4-D, as long as properly used, is still a cost-effective insurance agent. Based on years of practice, the following considerations for applying 2,4-D are proposed: