1.日烧的症状和发生原因日烧又称日灼,是由太阳照射而引起的生理病害。在我国各地均有发生,尤以北方干寒地带果园在干旱的年份发生更多。桃树的日烧因发生时期不同,有冬春日烧和夏秋季日烧两种。(1)夏秋日烧与干旱和高温有关。由于温度高,水分不足,蒸腾作用减弱,致使树体温度难以调节,造成枝干的皮层或果实的表面局部温度过高而灼伤 1. Symptoms and causes of burning Japanese burn, also known as sunburn, is caused by the sun’s physiological damage. Occurred in all parts of our country, especially in the dry and cold northern orchards occur more in the dry years. Peach trees due to different occurrences of the burning period, there are winter and spring burning on the burning of two kinds of summer and autumn. (1) summer and autumn burning and drought and high temperature. Due to high temperature, lack of water, transpiration weakened, resulting in difficult to regulate the temperature of the tree, causing the surface of the branches of the cortex or fruit surface temperature is too high and burns