聚合草(Symphtum officinale L.)是我国广泛推广的一种高产优质牧草。1979年在新疆引种试种过程中,发现一种矮缩病,症状与吉林地区发现的一种“花叶型毒素病”相似,病株矮小,叶片萎缩发黄。经抗菌素处理及超薄切片电镜观察,证实该病系一种类菌原体浸染所致。为查明该病对生产的影响,1979～1981年进行了病害对聚合草生长影响的研究。田间定株系统观察表明,病害蔓延迅速,1979年全田发病率为5.6％,1980年达34％,寄 Symphtum officinale L. is a kind of high-yield and high-quality grass widely popularized in our country. In 1979, when introduced and planted in Xinjiang, a dwarf disease was found with symptoms similar to those found in Jilin Province. The diseased plants were short and the leaves shrank yellow. Antibiotic treatment and ultra-thin section electron microscopy, confirmed that the disease caused by a class of mycoplasma dip. In order to find out the influence of the disease on the production, from 1979 to 1981, the influence of the disease on the growth of the polymerized grass was studied. Strain plant system observations show that the rapid spread of disease in 1979, the field incidence was 5.6% in 1980 up to 34%, send