答:通常说的“乌米”,是由真菌中的黑粉菌寄生产生的丝黑穗病.春天,当高粱种子发芽时,土壤、粪肥及种子上残存的丝黑穗病黑粉孢子也随之发芽,并在高粱幼芽出土前侵入芽鞘.经一段生长,在作物生长点附近形成许多菌丝体,菌丝随作物的生长而上升,到幼穗形成时,病菌就占据和破坏了整个穗部,形成了“乌米”. A: The commonly known “Wumei” is a head smut that is parasitic by the fungus spores of the powdery mildew in the fungus. In spring, when the sorghum seed is sprouted, the soil, the manure and the remaining stem smut spore Germinate and invade the bud sheath before the emergence of sorghum shoots.After a period of growth, many mycelium forms near the growing point of the crop, mycelium increases with the growth of the crop, when the panicle is formed, the bacteria occupy and destroy The whole ear, forming a “Umi.”