小麦秆黑粉病,曾在我县发生较重,解放后经大力防治,已消灭了黑粉病的危害。但是近几年由于私自引种、串种,播期常常遇到干旱,致使小麦秆黑粉病又有回升,已使部分麦田受到危害。威胁着小麦生产。 一、发生及症状 小麦黑粉病是由真菌侵染引起的。其发病症状可发生于茎、叶、穗各部分。在小麦分蘖拔节到抽穗期均可发病,以小麦拔节后症状表现明显。发病植株呈矮小,分蘖增多,叶片畸形或卷缩;在叶、叶鞘 Wheat stalk powdery mildew, occurred in my county heavier, after the liberation by vigorous prevention and control, has eliminated the hazards of smut. However, in recent years due to the introduction of private, string, sowing often encounter drought, resulting in the recovery of wheat stalk powdery mildew has made some of the wheat fields harmed. Threatening wheat production. First, the occurrence and symptoms of wheat powdery mildew is caused by fungal infection. The incidence of symptoms can occur in the stem, leaf, ear various parts. In tillering and tillering to heading stage can be disease, the symptoms of wheat after jointing obvious. Diseased plants were dwarfed, tillering increased, leaf deformity or curling; in the leaves, sheaths