1978年以来,以北海道南部为中心,室内培育中的促长海带幼苗种绳出现赤斑,赤斑部掉苗现象屡屡发生,严重影响苗种供给。日本学者绘面良男等(1988)研究了函馆近郊2处海带育苗场种绳赤变原因,并分离出病原菌。研究内容包括病原菌分离、分离株性状检查,分离菌株溶菌性调查、聚乙烯醇纤维绳分离菌株着色与赤斑再现试验。研究结果表明,赤变因一种 Since 1978, with the southern part of Hokkaido as the center, the emergence of erythema on the seedling ropes of the kelp cultivars in nursery schools has occurred frequently, and the phenomenon of dropping seedlings in the erythema often occurs, which seriously affects the supply of seedlings. Japanese scholar Yasumasa Noboru et al. (1988) studied the reasons for the species redox change in two kelp nurseries on the outskirts of Hakodate and isolated pathogens. The research contents include the isolation of pathogenic bacteria, the examination of the traits of the isolates, the investigation of the bacteriolytic activity of the isolated strains, the stain of the strain of polyvinyl alcohol fiber cord and the red-spot reproduction test. The results show that a kind of red change