Lisianthus Fusaria wilt: inter- and intra-specific variation in virulence of pathogens and biocontrol of the disease based on vietnamese Streptomyces goshikiensis STR61.

This article focuses on the pathogenicity of Vietnamese Fusaria species causing lisianthus Fusaria wilt (LFW) and evaluates the potential of native Streptomyces bacteria for biological control. Among the Fusaria species tested, Fusarium vanleeuwenii was identified as the most aggressive pathogen, followed by Neocosmospora solani, with Fusarium annulatum being the least pathogenic. The study isolated Streptomyces goshikiensis strain STR61 from rhizosphere soil, which demonstrated strong in-vitro antifungal activity against multiple Fusaria species complexes and significantly reduced disease incidence and severity caused by F. vanleeuwenii in lisianthus seedlings while promoting plant growth under controlled conditions. These findings suggest that S. goshikiensis STR61 is a promising native biocontrol agent for managing Fusaria diseases in lisianthus, offering a sustainable alternative to chemical fungicides in Vietnam.