Comparison of cultural characteristics and pathogenicity between Sclerotinia scleriotorum and a sclerotia-forming fungus causing stem rot of welsh onion
Sclerotinia sclerotiorum was collected from rapeseed in 12 different regions of China and a sclerotia-forming fungus causing stem rot of welsh onion was colleted from Dali County of Shaanxi Province. According to the mycelial growth rate and the colony morphological characteristics, sclerotial yield ard formation pattern on colony, and the pathogenicity on rapeseed, the strains were divided into three types: A, B and C. Types A and B were from rapeseed, whereas the type C was from welsh onion.The pathogenicity sequence of the three types was A＞B＞C. The three type strains were incubated at 16℃, 20℃, 24℃, 28℃ and 32℃. Under each temperature, mycelial growth of the type A strains was quicker than the type B strains, and the growth of type A and B were quicker than the type C strains. The optimum temperature for growth and sclerotial production of the three types of strains was 24℃. The result of investigation in the field indicated pathogenic fungi of stem rot of welsh onion (Type C strains) did not infect rapeseed, so rapeseed may be grown with welsh onion for crop rotation.
Sclerotinia. sclerotiorum stem rot of welsh onion temperature pathogenicity
LI Jianchang LI Yonghong LI Dianrong TIAN Jianhua
Shaanxi Rapeseed Branch of National Centre for Oil Crops Genetic Improvement, Dali 715105, China
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1380-1382
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）