Especially in continuous cropping fields, F. It can multiply in the vascular bundles, causing vascular bundle blockage and preventing the plant from absorbing nutrients and water, thus causing the plant to wilt. Therefore, the occurrence of disease is mainly concentrated after transplanting or in the late growth period with abundant rainfall. When the conditions are suitable, the pathogen infects the wound or the intercellular space of the root system. It can be spread by rain and irrigation water, air currents, and seeds.
Pepper wilt is a worldwide soil-borne disease, which pathogen have a wide host range and the spores can live in the soil for a long time 1. Pepper Fusarium wilt is an important and frequent disease, which is caused by Fusarium oxysporum Schlecht, in pepper ( Capsicum annuum L.) production. A continuous application may improve the control effect. Thus, strain MHT1134 effectively improved the microbial community structure of the soil, and it also positively affected soil quality. Additionally, as the cropping years increased, the soil abundance of Actinobacteria gradually decreased, but it significantly increased from 17.56 to 22.44% after the MHT1134 application. However, the relative abundances of Trichoderma and Chaetomium significantly increased. The relative abundances of Fusarium, Gibberella increased along with the planting years, but decreased after the MHT11134 application. With the continuous cropping years increased, the microbial abundance and diversity decreasing significantly. 4 kinds of physical and chemical indexes and 6 kinds of enzyme activities in soil were increased.
The MHT1134 control effects on pepper wilt after application 1 year and 2 years were 63.03% and 70.21%, respectively. Samples were taken from fields that had been continuously planted for 1, 5, 9 years, and applied the strain MHT1134 for 1 and 2 years. To clarify the control effects of Trichoderma hamatum strain MHT1134 on Fusarium wilt in continuous pepper cropping fields and its regulatory effects on soil microecology, the physical and chemical properties, enzyme activities, community structures of soil samples from five field types were analysed.
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