棉花早衰、红叶茎枯病与棉花轮纹斑病间关系辨析

 系统分析了棉花早衰、红叶茎枯病与棉花轮纹斑病间的关系。棉花早衰依据其成因差异可划分为3种类型，分别为生理性早衰、病理性早衰及生理病理复合性早衰。近些年来生理病理复合性早衰在我国发生最为普遍，危害最为严重。系统分析了生理病理复合性早衰的成因及有关研究进展，在此基础上，提出适宜我国棉花生产、以“选种、壮苗、补钾、抗逆、防病”等技术为核心的棉花早衰控制技术体系。

Discrimination on the Relationship among Cotton Premature Senescence, Red Leaf Disease and Alternaria Leaf Spot Disease

Relationships among cotton premature senescence, cotton red leaf disease and Alternaria leaf spot disease were comprehensively analyzed. Based on the different causes, cotton premature senescence could be divided into three types, which were physiological, pathological premature senescence and compound premature senescence mixed with physiological and pathological factors. Among them，the often appearance of compound premature senescence always caused serious harm for cotton production in recent years. The causes of compound premature senescence often happened at mid to late cotton growth period was particularly explained as that cotton leaves enter into aging process, when cotton encounter adverse environmental conditions which can cause physiological impairment and decrease in disease resistance to cotton leaves, and make the cotton leaves being infected by Alternaria leaf spot pathogens Alternaria alternata. In addition, a comprehensive prevention technology for cotton premature senescence was put forward on the basis of our investigation results in recent years.