在小麦抽穗期,常有麦穗抽出的较早,刚露出苞叶一点就可以看到穗的外面包有一层灰白色薄膜,内部完全变成黑粉,薄膜破裂,黑粉随风吹散;穗子抽出后,经风吹雨淋只剩下穗轴。一株小麦只要有一个病穗出现,往往所有的穗也都会出现,但也有一株小麦上有一部分穗生病,另一部分正常结实;或一个穗子下半部生病,上半部小穗健全。这些症状就叫小麦散黑穗病,群众叫乌米。农颜“黄疸收、黑疸丢”中的黑疸,指的就 In the heading stage of wheat, the ears are usually picked out earlier, just showing the husk leaves can be seen outside the spike covered with a layer of gray film, the internal completely into black powder, the film rupture, black powder wind blows; After the extraction, the wind and rain only cob. Whenever a panicle emerges from a wheat panicle, all the panicles will usually appear. However, some of the wheat panicles are sick and some are normal and strong; or the lower panicle of a panicle is sick and the upper panicle is healthy. These symptoms are called wheat scattered smut, the crowd called Wu Mi. Agricultural Yan “jaundice received, jaundice lost” in the jaundice, refers to the