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对十字花科蔬菜根瘤病菌的休眠孢子生存期进行三种试验: 1.探讨土壤中休眠孢子的生存期:把根瘤病菌的土壤装入8目(筛孔)的50毫升容器内,用报纸覆盖,瓶口稍挪开,在玻璃温室中保存50个月,把已风干的土壤,分散在花盆中。播种大白菜,试验分过湿区和半干燥区,50天后调查株发病率和为害程度,过湿区的平均株发病率是100％,病情指数是20～30;半干燥区的株发病率为80％,病情指数是9。 2.对于感病根部冷冻保藏的休眠孢子生存期本病在冷冻保藏条件下,分别保存17个月和82个月,用激发本病的火山灰土的黑土和发病较少的冲积砂层土进行比较,结果株发病率均为100％,病情
Three tests were conducted on resting spore survival of cruciferous root nodules: 1. Survival of resting spores in soil: The soil of Rhizobium was placed in a 50 ml container of 8 mesh (mesh) and covered with newspaper , The bottle mouth slightly away, kept in a glasshouse for 50 months, the air dried soil, scattered in the pots. After sowing Chinese cabbage, the wet and semi-dry areas were divided and the morbidity and degree of damage were investigated after 50 days. The average incidence of the strain in the wet area was 100%, and the disease index was 20-30. The incidence of strains in the semi-drying area 80%, the disease index is 9. 2. Survival of dormant sporozoites frozen and preserved at the root of susceptible disease The disease was stored for 17 and 82 months under the conditions of cryopreservation, respectively, with black soil of volcanic ash soil and less alluvial sand soil Comparison, the results of the incidence of strains were 100%, the disease