柑橘类果树幼果发育期(膨大期)需要有大量水分,且最适温度为25℃~30℃。若进入8月温度高达35℃以上,会加剧水分蒸发,使呼吸强度增大,蒸腾量就会大于根系水分吸收量,致使叶片连续向幼果吸夺水分,使幼果失水而大量落果;同时因温度骤升,会影响光合效能导致碳水化合物不足,引起树体激素缺乏,便会加剧果梗离层形成而落果,若高温持续时间长,必然造成柑橘出现减产,其防止措施是: Citrus fruit tree juvenile development period (swollen period) requires a lot of water, and the optimum temperature is 25 ℃ ~ 30 ℃. If the temperature reaches as high as 35 ° C in August, it will exacerbate the evaporation of water and increase the respiration intensity, and the transpiration amount will be greater than that of the root water absorption, causing the leaves to suck water continuously to the young fruit, At the same time due to temperature rises, will affect the photosynthetic efficiency lead to carbohydrate shortage, causing the body hormone deficiency, it will exacerbate the formation of fruiting pedicel from the formation of fruit drop, if the long duration of high temperature, will inevitably lead to the reduction of citrus, the prevention measures are: