论文部分内容阅读
今年小麦叶枯病在山东省阳谷县大流行,病株率100%,病叶率高达95%。病株严重叶枯,影响灌浆,造成减产1—2成。成为生产上的重要问题。小麦叶枯病主要危害叶片和叶鞘。小麦自第一真叶至旗叶都可发病。在叶片上生成分散的病斑或造成大片斑块,使叶片由叶尖向下枯萎死亡,抽穗以前下层叶片发病较多,病斑呈圆形或梭形,淡绿色或黄白色并渐扩大成不规则淡褐色斑块,散生黑色小颗粒,严重时全叶黄褐枯死。小麦叶枯病病菌(Septoria tritici Rob.etDesm.)。当秋季病菌侵入麦苗后,以菌丝体
This year, wheat leaf blight is a pandemic in Yanggu County of Shandong Province. The rate of diseased plants is 100% and the incidence of diseased leaves is as high as 95%. Severe leaf blight disease, affecting grouting, resulting in cut 1-2 into. Become an important issue in production. Wheat leaf blight is a major hazard to leaves and leaf sheaths. Wheat from the first true leaf to the flag leaves can be disease. Spread on the leaves to generate scattered spots or cause large patches, the leaves withered down from the tip death, less incidence of lower leaves before heading, lesions were round or fusiform, pale green or yellow-white and gradually expanded into Irregular light brown patches, loose black small particles, severe yellowish brown dead leaves. Wheat leaf blight (Septoria tritici Rob. Et Desm.). When autumn germs invade wheat seedlings to mycelium