聊城市城区大叶黄杨白粉病消长规律及病情相关性分析

Analysis on the Growth and Decline Law and Disease Correlation of Powdery Mildew on Euonymus japonicus in Liaocheng City

[目的]了解大叶黄杨白粉病的消长动态。[方法]于2006年调查聊城市城区大叶黄杨白粉病的发生规律,同时对大叶黄杨叶片正反面病情的相关性进行分析。[结果]大叶黄杨白粉病的发生在聊城市城区有明显的季节性,每年有两个发病高峰,即4月中旬至5月中旬和9月上旬至10月上旬。大叶黄杨叶片正反面的病情指数呈极显著正相关,感病叶片背面的病情随正面病情的加重而加重。防治大叶黄杨白粉病的关键是抓住关键时期,统一行动,综合防治。[结果]该研究为聊城市城区综合防治大叶黄杨白粉病提供了理论依据。

[Objective]The study aimed to know about the growth and decline dynamic of powdery mildew on Euonymus japonicus. [ Method] The occurrence law of powdery mildew on E. japonicus in Liaocheng city was investigated and the disease correlation between the front and back side of E. japonicus leaves was analyzed in 2006. [ Result] The occurrence of powdery mildew on E. japonicus in Liaocheng city had obvious seasonality. It had 2 peak periods of disease, i.e. from middle Apr. to middle May and from early Sep. to early Oct, The disease indices in front and back surfaces of E. japonicus leaves showed extremely significantly positive correlation and the disease in the back side of infected leaves aggravated along with the aggravation of that in the front side of leaf.Seizing crucial period, unifying action and integrated control were the key to control powdery mildew on E. japonicus. [ Conclusion]The study supplied theoretical basis for the integrated control on powdery mildew on E. japonicus in Liaocheng city.