笔者经多年实践,采果前后在柑桔树冠上喷布一次1％淀粉加50ppm2,4-D液,可保护叶片安全越冬。喷后叶片象覆上了一层薄膜,既可抑制叶片蒸腾作用,又有一定的保温效果。据田间观察,凡喷了淀粉液的树,叶色青绿,落叶少,冻害轻,着果率明显高 The author after many years of practice, before and after picking fruit in the citrus canopy spray 1% starch plus 50ppm2,4-D liquid, can protect the safety of the wintering. After spraying like a leaf covered with a thin film, can inhibit the transpiration of leaves, but also a certain degree of thermal insulation effect. According to field observations, where sprayed starch solution of trees, leaf color green, less leaves, frost damage, the fruit was significantly higher