低濃度的2,4-D对柑桔有良好的增产效果,四川、江西、福建、湖南等省用20—60 ppm的2,4-D对柑桔品种“甜橙”、“雪柑”、“福桔”、“温州蜜柑”等在幼果期进行噴射,对提高座果率都有良好的表現。浙江省黄岩柑桔試驗站于1957—1959年用2,4-D的20—50 ppm在柑桔品种“本地早”、“早桔”和“温州蜜 Low concentrations of 2,4-D had a good effect on citrus production. Citrus cultivars “Sweet Orange” and “Xuegan” were harvested with 20-60 ppm 2,4-D in Sichuan, Jiangxi, Fujian and Hunan provinces, , “Fukui”, “Satsuma mandarin” and other spray in the young fruit stage, to improve the fruit rate have a good performance. Huangyan Citrus Experimental Station in Zhejiang Province from 1957 to 1959 with 2,4-D of 20-50 ppm in citrus varieties “local early”, “early orange” and "Wenzhou honey