Discussion on some issues concerning frost freezing damage during pear blooming period in northern China

Abstract：The frost freezing damage during pear blooming period occurs frequently in same years in northern China, it can cause huge negative impact on the pear industry.Due to the complexity of frost injury onset and lack of solid studies in this field, growers sometimes adopt preventive measures aimlessly in fight against the frost freezing damage, resulting in less success or even just waste of money and manpower.For sake of the attitude toward to the management after frost damage takes place, a significant divergence exists among the growers.Therefore, it is a new challenge for us to realize the essence of frost occurrence and the emphasis on research and development.Based on the literature and practice in recent years, some issues concerning frost freezing damage during pear blooming period are discussed, so as to provide new train of thought for technical development in the future.