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从我国新疆、内蒙、西藏、北京和山东等省区的小麦、大麦、野黑麦、冰草、偃麦草和雀麦上分离到13个黑颖病菌株,在苗期、分蘖期和孕穗期,喷雾接种16属27种禾本科植物,对其中感病的6属15种植物和燕麦又做注射接种。根据各个菌株对小麦、大麦、黑麦、冰草、偃麦草和雀麦的致病性差异,初步将其划分三个致病变种:1.禾谷类致病变种]X.campestris pv.cerealis(Hagborg)Dye.]:包括7个菌株,自然条件下发生在冰草、雀麦和偃麦草上;人工接种还可侵染小麦、大麦和黑麦。2.小麦致病变种(X.campestris pv.undulosa):包括4个菌株,自然条件下发生在小麦上,人工接种可侵染大麦和黑麦,但有一个菌株注射接种能轻度侵染雀麦。3.大麦致病变种(X.campestris pv.hordei):包括2个菌株,自然条件下发生在大麦上,注射接种能轻度侵染偃麦草。13个菌株喷雾接种猫尾草、早熟禾、画眉草、马唐、狗尾草、稗草、披碱草、羊茅草和水稻、均不侵染。
Thirteen strains of S.japonicum were isolated from wheat, barley, wild rye, Agropyron sp., And wheat germplasm from Xinjiang, Inner Mongolia, Tibet, Beijing and Shandong Provinces at the seedling, tillering and booting stages , 27 kinds of gramineous plants of 16 genera were inoculated, and inoculation was inoculated again on the 15 genera of 6 genera and 6 genera of susceptible plants. According to the pathogenicities of each strain to wheat, barley, ryegrass, Agropyron chinense, Agropyron chinense and Capsicum, three disease-causing strains were preliminarily divided into three groups: 1.Campestris pv.cerealis Hagborg) Dye.]: Includes 7 strains that occur naturally on icy grass, brome and Agropyron ; artificial inoculation can also infect wheat, barley and rye. 2. X. campestris pv. Dundosa: Including four strains, occurring naturally on wheat, and artificial inoculation can infect barley and rye, but one strain is inoculated with a species that can infect mildly wheat. 3. Barley-producing disease (X. campestris pv. Hordei): Including two strains, occurs naturally under barley, inoculation can invade slightly with the thin-layer. Thirteen strains were inoculated with Timothy grass, Bluegrass, Thrush, Crabgrass, Setaria, Echinochloa, Elymus, Fescue and rice without infestation.