The Correlation Analysis of Sensitivity of Fusarium to the Volatile and Extract of Garlic and Their Pathogenicity

In this study, Fusarium oxysporum, caused the rot of garlic bulb, was identified by the method of morphology and molecular method. The study of mycelia growth rate method indicated that the volatiles and extracts of different part of garlic had strong inhibitory activity against F. graminearum, F. oxysporum, and F. moniliforme. The inhibitory ability was garlic> leaf> stem > root. The sensitivity of F. oxysporum isolated from rot garlic bulbs and F. graminearum isolated from wheat to garlic volatiles and extracts showed that the population of F. graminearum was more sensitive than that of F. oxysporum. Pathogenicity analysis showed that all F. oxysporum isolated from garlic bulb could infect garlic. Most of F. graminearum isolates had not pathogenicity to garlic bulb, except some isolates of F. graminearum, which were insensitive to volatiles and extracts, can cause garlic rot. These data indicated that the resistance of Fusurium to volatile and extracts can be developed. Therefore, a long-term continued intercropping or rotation with garlic to control root rot caused by Fusarium should be avoided, which could lead to resistance of pathogens to volatiles and extracts and reducing the control effect.