小麦散黑穗病,俗称黑疽、灰包等,在小麦产区普遍发生,一般田块发病率在1%~10%,严重田块发病率可达20%以上。一、发病症状主要为害穗部,病穗比健穗较早抽出。最初病小穗外面包一层灰色薄膜,成熟后破裂,散出黑粉(厚垣孢子),黑粉吹散后,只残留裸露的穗轴。病穗上的小穗全部被 Wheat scattered smut, commonly known as black gangrene, gray packets, etc., occur in the wheat producing areas, the general field incidence of 1% to 10%, severe field incidence of up to 20%. First, the incidence of symptoms of the main damage to the ear, sick ear ear earlier than Jian Sui out. The earliest spikelets covered with a gray film, ruptured after maturity, black powder (chlamydospore) was emitted, black powder blown away, leaving only bare cob. Spikelets on sick panicles are all