渭北西部苹果白粉病发病特点研究初报  

Preliminary Studies on Characters of Powdery Mildew of Apple in the West of Weibei-dryland of Shaanxi Province

作　　者：李随院[1] 高立强[1] 杨家荣[1] 胡小平[1] 苟建军[1] 俞征[1] 樊雅琴[2] 

机构地区：[1]西北农林科技大学植保资源与病虫害治理教育部重点实验室,陕西杨凌712100 [2]杨凌职业技术学院林学系,陕西杨凌712100

出　　处：《西北农业学报》2004年第4期37-40,共4页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：欧盟科技项目(ICA4-IC-2001-10001)。

摘　　要：陕西渭北西部春季苹果白粉病发病始期为4月中旬,5月下旬达到发病高峰期,6月上旬逐渐下降,而后维持低水平延续,田间病情消长与温度密切相关,湿度次之。病害流行适宜温度在日平均12℃左右,比前人报道低6～8℃,日均温度21℃以上则对病害流行有抑制;同一棵树不同方位病情严重程度差异明显,树冠中间发病最轻,南部较重,东、西、北方位最重。不同叶龄(日龄)的叶片抗病性差异显著,30日龄叶片抗性较强,3～9日龄叶片抗性较差。The first appearance of powdery mildew of apple in the west of north dryland of Weibe river of Shaanxi province was in the middle ten days of April and it reached the peak in the last ten days of May and it decreased to low level in the first ten days of June. Regression analysis of disease incidence showed that the temperature was first factor and the moisture was second factor. The optimum temperature of the disease epidemic was 12℃ in daily mean, and it is lower 6～8℃than other records. The trend of the disease was inhibited while daily mean temperature was over 20℃. The severity of disease in different leaf positions of the tree was significantly different and it was lighter in inner crown of the tree, but heavy in the south and heavier in the east ,west and north parts of a tree. The susceptibility of different leaves age to disease was variable, the susceptibility of leaves age 3 d to 9 d to disease was higher than that of over 30d leaves.

关 键 词：渭北西部地区 苹果 白粉病 发病特点 

分 类 号：S436.611.14[农业科学—农业昆虫与害虫防治]