摘要
为明确核桃叶斑病的发生动态及病情扩展进程,于2017年4—10月在洛浦县3个乡镇的观测园内,对核桃叶斑病病情以及病斑产生时间、扩散规律进行系统调查。结果表明:核桃一次枝发病始于4月中下旬,5月下旬和7月中旬为发病盛期,9月中旬后病害发展缓慢或停滞。二次枝于6月上中旬发病,6月下旬为第1个发病高峰,8月下旬为第2个发病高峰,病害末期同一次枝。病原菌首先侵染复叶基部的小叶,逐渐向上部叶片扩展蔓延,36～45 d后整个复叶感病。单叶病斑扩展速度越快,病情发展越快。5月中旬病斑扩展最快,单病斑从开始产生到连片需要约50 d。
In order to clarify occurrence dynamics of walnut leaf spot and extension process of pathogenic condition,state of illness,produce time and diffusion rule of disease spot were systematic investigated in observation gardens in three villages and towns of Luopu County during April to October,2017.The result showed that primary branches began to be infected in mid-late April,and the peak period of the disease were in late May and mid July.Disease developed slowly,even stopped after mid September.Secondary branches were infected in early to mid June.The first peak period of disease was in late June,and the second one was in late August.The end period of disease was the same as that of primary branches.The pathogen infected base leaves on compound leaves at first,and gradually extended to upper leaves.The whole compound leaves were infected after 36~45 d.The faster the expansion rate went,the faster the disease developed.The extension speed of disease spots reached the highest in mid May.It took about 50 days from the appearance of a single disease spot to the forming of continuous pieces.
出处
《中国森林病虫》
2019年第1期19-22,共4页
Forest Pest and Disease
基金
国家自然科学基金项目(31560210)
国家大学生创新项目(201610758061)
关键词
核桃叶斑病
发生动态
扩展进程
病斑
扩展速率
walnut leaf spot
occurrence dynamic
diffusion process
disease spot
extension rate
