<![CDATA[Background: Fusarium wilt, caused by Fusarium sp., is one of the main obstacles to chili pepper (Capsicum frutescens L.) production. Disease control using chemical pesticides and fungicides is considered effective in agricultural fields, but excessive use can result in environmental contamination and health risks, including cancer. This makes the application of biological control an effective strategy in overcoming Fusarium wilt disease in chili plants, especially in increasing plant productivity. This study aims to test the effectiveness of biopriming using Beauveria bassiana secondary metabolites in suppressing Fusarium wilt infection in chili seeds in vivo. Methodology: This study used a Completely Randomized Design (CRD). Secondary metabolites were applied to chili seeds at four concentration levels (15%, 25%, 35%, and 45%) as well as positive and negative controls. The treated seeds were planted in a medium inoculated with pathogens and observed for nine weeks. Disease intensity was recorded every seven days and analyzed using ANOVA followed by Tukey's Honestly Significant Difference (HSD) test at the 5% level. Findings: The results of the variance test 49–63 days after sowing (DAS) showed significant differences between treatments; a further HSD test was conducted at a 5% level. The application of Beauveria bassiana secondary metabolites as a biopriming agent on chili seeds is considered to be ineffective. Contributions: This study provides the first in vivo evidence on the application of Beauveria bassiana secondary metabolites as a seed biopriming agent to suppress Fusarium wilt in chili plants, thereby advancing preventive biocontrol strategies and contributing to the development of environmentally sustainable plant disease management]]>
