关键词: 柑橘黑点病, 症状, 发病因素, 防治技术

Abstract: Melanose, caused by Diaporthe citri, has become a serious disease on citrus fruits in citrusgrowing region of Zhejiang, Jiangxi provinces etc. It deteriorates exterior quality and brings down sale price of citrus fruits for fresh marketing. We have been involved in the investigation of the symptoms, prevalence and control methods of this disease since 2008. It was demonstrated that citrus fruits are susceptible to this disease in whole developmental stage, and especially susceptible during the enlarging stage. The order of melanose severity was closely associated with citrus age, times of fertilization and fungicide application. The best control efficiency could be obtained by application of protective fungicides such as mancozeb (followed the instruction of manufactory) 20 days interval after fruitsetting. Superior efficiency would be even achieved when 0.25% to 0.5% mineral oil (SK spray oil) was mixed with mancozeb. Inter and intranational information regarding the symptoms, characteristics of pathogen, epidemic factors and disease control of melanose was elaborately integrated in this paper.

Key words: citrus melanose, symptoms, epidemic factors, disease control