室或露地番茄栽培，如果在开花期遇到15℃下的低温，就会导致番茄大量的落花落果现象，使番茄严重减产，降低品质和经济效益。目前，预防番茄低温落花落果，多采用如下的激素处理措施。其具体的防御措施如下。2，4——D抹花在番茄花期，用毛笔蘸15—20ppm的2，4-D逐花涂抹整个 Room or open-field tomato cultivation, if encountered in the flowering of 15 ℃ under the low temperature, it will lead to a large number of flowers fall and fall tomato, so that a serious cut in tomato production, reducing quality and economic benefits. At present, the prevention of low temperature drop flowers tomato, use the following hormone treatment. The specific defensive measures are as follows. 2,4 - D wipe flower Tomato florescence, with a brush dipped in 15-20ppm 2,4-D flower by the entire smear