温度是果树生存的重要条件之一。在最适温度条件下，果树生长发育良好；在最高和最低温度条件下，果树开始或停止生长发育，再低或高到一定程度时，引起果树受害甚至死亡。因低温受害或坏死有冷害和冻害两种情况，因高温引起的受古为热害，也就是“‘R烧”。就冻害程度而言，它 Temperature is one of the important conditions for the survival of fruit trees. Under optimum temperature conditions, fruit trees grow and develop well; under the highest and lowest temperature conditions, the fruit trees start or stop their growth and development, and then cause the fruit trees to suffer or even death when they are low or high. Cold damage or necrosis due to cold and cold injury have two cases, due to the heat caused by the ancient heat, that is, “R burn.” In terms of degree of frost damage, it