Abstract:

When moved under protected cultivation, the herbaceous peony often suffers from a leaf and branch wilt, causing serious damage. In order to clarify the causes and understand the occurrence regularity of the disease, the author regularly observed the occurrence of the disease. According to its symptom, pathogenic fungi isolation, pathogenic fungi morphologic characters and host range, it was identified that the wilt was caused by gray mould. The pathogen was Botrytis cinerea Pers. Research shows that the temperature for this pathogen growth and sporulation was from 4-28℃ with the optimum from 16-24℃, pH from 2-11 with the optimum from 3-5. The light influenced mycelial growth and sporulation, illumination was advantageous to mycelial growth while dark condition to sporulation. The continuous light can not produce the spores.