Effects of Trichoderma viride TV41 on spatial distribution of Fusarium oxysporum FW0 around watermelon plant and fusarium wilt control

Abstract:

[Objective] To further explore the effect of Trichoderma viride TV41 on spatial distribution of Fusarium oxysporum FW0 around watermelon plant and fusarium wilt control of watermelon. [Methods] The number of F. oxysporum in plant rhizosphere, root surface, and internal of the plant was counted. The proportion of lateral roots infected by F. oxysporum and the infecting process of F. oxysporum in the plant were investigated. The pot experiment was carried out for three times and the incidence rate was recorded. [Results] The results showed that the number of TV41 was always significantly higher than that of F. oxysporum in watermelon rhizosphere when the inoculation concentration of TV41 and FW0 was same with 5×105 spores/g substrate. The number of F. oxysporum in plant rhizosphere, root surface of TV41+FW0 treatment was 103 CFU/g substrate, which was decreased significantly compared with the control of 104 CFU/g substrate. The Trichoderma viride TV41 not only retarded the infecting process of F. oxysporum in plant, but also reduced the number of F. oxysporum in plant root and stem. The disease incidence was reduced greatly when TV41 was applied. [Conclusion] The T. viride TV41 can decrease disease incidence rate of Fusarium wilt of watermelon by 60% through impacting the spatial distribution of F. oxysporum around watermelon plant.