陕西关中落叶松杨栅锈菌夏孢子流行规律分析

Analysis on Urediniospore Spreading Law of Melampsora larici-populina in Guanzhong Area of Shaanxi Province

利用夏孢子捕捉技术和灰色预测理论,对青杨叶锈病病原菌落叶松杨栅锈菌夏孢子在陕西关中地区的流行规律进行初步研究,结果显示:该菌夏孢子8月左右开始传播,山间9月中旬达到最大传播程度,平原10月中旬达到最大传播程度,11月上旬末夏孢子传播结束;STC样地夏孢子流行规律的数学模型为:Xt=81.08×e-0.49 t;由该病原菌引起的青杨叶锈病发病于关中西部,并逐渐由西向东,由低纬度向高纬度,由高海拔向低海拔地区蔓延,山间发病早于平原。

The spreading rule of urediniospores of Melampsora larici-populina,which is the pathogen of Populus cathayana leaf rust disease,in Guanzhong Region of Shaanxi Province was primarily studied by means of urediniospores grab technique and Gray Theory.The results showed that urediniospores were start to be spread around August and to be ended in early November each year,the maximum spread in the mountainous and plain areas was in mid-September and mid-October respectively.The mathematical model of the urediniospore spreading rule was Xt=81.08×e-0.49t in STC plot.This study revealed that Populus cathayana leaf rust disease caused by Melampsora larici-populina occurred in the west of Guanzhong,and then spread from west to east,from low latitude to high latitude,from high altitude to low altitude and from the mountainous area to the plain area.