Abstract

The aim of this work is to discuss the effect of climate change on citrus trees, particularly temperature as important factors affecting citrus growth and productivity, the optimum temperature for citrus growth is 25-30^oC, while the highest level of photosynthesis occurring at 30^oC. The fluctuation in temperature during growth season effect on vegetative growth and productivity of citrus trees, there are various negative effects of low temperature on citrus tree including dropping flowers and fruitlets, disorder in mature fruit, also, new flushes and main branches are deleterious under cold weather, also, freezing and cold temperatures are the determining factor for citrus cultivation. High-temperature has adverse effect of on different growth stages and citrus fruit particularly when reaching 40^oC or above, also, warming weather delays flowering and reduce crop yield, also, there are negative effects of temperature on fruit quality and harvesting.