陕西关中地区小麦白粉菌越夏问题的再探讨

Analysis of Summer Wheat Powdery Mildew in the Central Shaanxi Plain

入夏期在陕西杨凌室外小气候环境下设置小麦白粉菌越夏试验 ,人工夏播感白粉病小麦品种 7期 .结果表明 ,每播期麦苗均能以病菌无性世代分生孢子形态感染罹病 ,使白粉病菌顺利越夏 .越夏期最热 ,旬平均气温为 31℃、平均湿度为 6 2 .5 5 % .从关中秦岭北麓和渭北旱塬麦区病菌越夏带调查分析表明 ,小麦白粉病菌可以分生孢子形态越夏存活 ;病菌越夏存活数量的多寡与当地越冬前菌源基础量的关系不大 .

In the open air inYangling, Shaanxi, an experiment was made on the summer wheat powdery mildew. The result showed that the conidiospores of pathogen oversummered successfully on wheat seedlings compatible with fungus cultivated in 7 different sowing periods, during which the average temperature of the hottest ten day period was 31℃, the average relative humidity was 62.5%. At the northern foot of Qinling mountain and dry land in the north of the Weihe River, the survey showed that the wheat powdery mildew of conidiospores can survive in summer, its amount has no much connection with pathogen in overwinter.