柑橘潜叶蛾与柑橘溃疡病的关系研究

Relationship between Phyllocnistis citrella and citrus canker disease

为研究柑橘潜叶蛾与柑橘溃疡病的关联性,于2017年4月-2018年10月,在湖北省秭归县郭家坝镇柑橘溃疡病发生区域进行了相关研究。通过田间和显微观察发现,柑橘潜叶蛾与柑橘溃疡病之间存在危害部位的同步性,并观察到溃疡病菌沿潜叶蛾虫道延伸传播的现象;同时发现柑橘溃疡病症状随柑橘潜叶蛾的为害而发生改变,即在病虫高发期,溃疡病病斑常以粉末状出现。通过对秭归县20 a的潜叶蛾百叶虫量、溃疡病发生面积及病情指数等数据分析发现,柑橘潜叶蛾与柑橘溃疡病在消长动态上存在年度间和年度内的同步性;对潜叶蛾虫道内的病原菌进行鉴定,证明潜叶蛾虫道内病原菌即为溃疡病病原菌。柑橘潜叶蛾与柑橘溃疡病的田间交互症状和消长动态上的同步性,揭示了柑橘潜叶蛾对柑橘溃疡病的影响途径,表明柑橘潜叶蛾是柑橘溃疡病快速扩散、加重发生的重要因子,预示了控制潜叶蛾发生对防治柑橘溃疡病的重要作用。

The relationship between Phyllocnistis citrella and citrus canker,was investigated at Guojiaba town in Zigui County,Hubei Province from April,2017 to October,2018.The results showed that P.citrella and citrus Canker occurred at the same Position based on the field observation and symptom comparison.Citrus canker diseases spread along with paths on leaves caused by P.citrella.The disease symptoms were varied as powdery during the high-incidence period of P.citrella.The 20 years data of P.citrella quantity of 100 leaves,occurrence area of citrus canker and disease index of citrus canker from Plant Protection Station of Zigui County showed that there was inter-annual and annual synchrony of increase and decline dynamic in incidence of P.citrella and citrus canker disease.Pathogens from the paths caused by P.citrella were molecularly identified as casual pathogen of citrus canker.It is indicated that P.citrella is an important factor for spreading citrus canker disease and increasing its severity.Preventing the incidence of P.citrella will be effective for controlling citrus canker disease.