Abstract:

【Objective】In recent years, The biological characteristics of Fusarium solani, the main pathogen of Yam root rot of Ya'an City, Sichuan Province, were researched.【Method】Studied the hypha, sporulation and conidiospore germination of different temperature, pH, illumination , carbon source nitrogen source and the lethal temperature of hypha and the conidiospore. 【Results】The results indicated that the suitable temperature and pH for the pathogen hypha growth was from 10 to 40℃ and 4 to 10, which of the optimum were 30℃ and grew better in full illumination conditions. The most suitable carbon and nitrogen sources were sucrose and peptone respectively. Different microelements resulted in different effects on the mycelia growth and spore germination. Mg²⁺ were conducive to spore germination, and Zn²⁺ inhibited the mycelia growth and spore germination. The most optimum temperature for conidia germination were 30℃ at full illumination conditions. The mycelial and conidium lethal temperature were 60 ℃ and treated about 10 minutes. 【Conclusion】The pathogen is not sensitive to pH，and different microelements could inhibit or promote the growth of pathogen，The result of the biological characteristics can lay a theoretical foundation for further control of yam root rot.