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马唐是农田旱地夏秋发生型一年生杂草,云南常见的有9种:危害玉米、花生、豆类、烤烟、园林等60多种旱地作物;发生频率50—98％,危害指数9.8—35.2。 1984年在本院前作为小麦的玉米试验田中发现马唐(D.samguinalis)黑粉病,经连续几年的定点观察,马唐上的发病率达98％,穗部感病,不侵染玉米、小麦、大麦等作物。1988年在光明园艺场苹果园的马唐上也发现了该病。病原经云南农大植保系罗文富副教授鉴定,为黑粉菌科,黑粉菌属拉宾黑粉菌(Ustilago robenhorstiana)。
Crabgrass is a summer weed-type annual weed in dry farmland. Nine species are common in Yunnan: over 60 kinds of dryland crops such as corn, peanut, beans, flue-cured tobacco and garden. The frequency of occurrence is 50-98% and the hazard index is 9.8-35.2. In 1984, we found D.samguinalis powdery mildew in maize field before this hospital. After several years of fixed-point observation, the incidence of crabgrass was 98%, the panicle was infected and noninfected Corn, wheat, barley and other crops. The disease was also found on the crab in the apple garden at Bright Horticultural Field in 1988. The pathogen was appraised by Associate Professor Luo Wenfu, Department of Plant Protection and Conservation, Yunnan Agricultural University. It is a member of Ustilago robenhorstiana.