关键词: 微米氧化亚铜, 微米氧化亚铜, 光催化, 降解率

Abstract: An investigation was carried out in 25 orchards in order to determine the occurrence and damage degree of apple canker in different regions of Henan province. These orchards were clustered into 4 categories based on apple canker disease incidence and disease index differences by the method of cluster analysis. The morbidity of the 4 groups was 90.4%, 77.0%, 26.0% and 18.7%, respectively, and disease index was 61.8, 31.0, 11.5 and 5.3, respectively. Meanwhile, analysis of 1758 disease spots in different regions showed that the healing spots were the main disease spots (49.8%), followed by the new infected spots (35.1%), and the least was recurrent spots (15.1% ). The spots of the disease were mainly distributed in main branches, lateral branches and bearing branches, and less in trunk and the central trunk. Disease scars were generally in the dayside, and those in the nightside were relatively less. Pruning wound was one of the major causes of disease occurrence, accounted for 57.5% .The results showed that apple canker universally occurred in Henan province, the disease was diversified among different regions or orchards in the same area. Snip injury had important effects on the disease.