Study on biological characteristics of Sclerotinia sclerotiorum in cauliflower in dry and hot area of Yunnan.

Sclerotinia is one of the main diseases of cauliflower in dry and hot area of Yunnan. In order to provide a scientific basis for the prevention and control of this disease,we studied the biological characteristics of Sclerotinia sclerotiorum in cauliflower collected from dry and hot area of Yunnan. The results showed that S. sclerotiorum could inordinately use various carbon sources and nitrogen sources,and glucose and peptone were the best carbon source and the best nitrogen source respectively. The mycelia of this pathogen could grow under the conditions of 12 ~ 36 ℃ and pH 3 ~ 11,and the optimum temperature and pH-value for mycelial growth were 28 ℃ and 5.5 respectively. The 24-h illumination was beneficial to the growth of vegetative body of this pathogen. The10-min lethal temperature for the mycelia and sclerotium of S. sclerotiorum was 55 ℃ and 70 ℃,separately.