Characterisation of Fusarium oxysporum f. sp. radicis - lycopersici in Infected Tomatoes in Inner Mongolia, China

Fusarium crown and root rot (FCRR), caused by f. sp. (FORL), is an economically important disease that affects tomatoes worldwide and has become more prevalent in China in recent years. In 2021 and 2022, tomato plants in greenhouses in Hohhot, Inner Mongolia, were observed showing symptoms of stunting, premature loss of lower leaves, and root rot. Fungal pathogens were isolated from 20 infected tomato plants and identified based on morphological observation and DNA sequencing. Twelve isolates were consistently identified as f. sp. - (FORL) via an analysis of the , TEF- , and genes. This is the first report of FORL in Inner Mongolia, China. The isolates were examined for their pathogenicity by inoculating them on tomatoes, eggplants, peppers, and chickpeas. The fungicide sensitivity of the isolates was determined. Effective concentrations for 50% growth inhibition (EC ) were measured using seven fungicides. The EC values of tebuconazole and prochloraz were