<p>Wheat damping-off disease, primarily caused by <i>Rhizoctonia solani</i> (<i>R. solani</i>), threatens seedlings and results in significant crop losses worldwide. While chemical fungicides can harm the environment, eco-friendly options are needed. Salicylic acid and curcumin are antimicrobial, but their nanoform effectiveness against <i>R. solani</i> is underexplored. <i>R. solani</i> was isolated from diseased wheat seedlings and tested with salicylic acid, curcumin, and their nano-formulations. Fungal growth inhibition was measured at concentrations from 5 to 75 ppm, with half-maximal inhibitory concentration (IC₅₀) values calculated to assess effectiveness. The study compares the natural and nano forms of salicylic acid and curcumin in their ability to control the pathogen. Both compounds showed dose-dependent antifungal activity. At a concentration of 25 ppm, the inhibition rates of the fungus were 19.77% and 57.63% for natural curcumin and salicylic acid, respectively. At a concentration of 5 ppm, the inhibition rates of the fungus were 17.23% and 33.20% for nano-curcumin and nano-salicylic acid, respectively. The inhibitory effect increases at higher concentrations, with complete inhibition observed at 75 ppm for both compounds in their natural forms. The IC₅₀ values for salicylic acid and curcumin were 23.19 and 40.17 ppm, respectively. In comparison, the IC₅₀ values were 11.71 ppm for nano-salicylic acid and 15.71 ppm for nano-curcumin. Nanotechnology can enhance the effectiveness of natural antifungal compounds. The data reveal, for the first time, that nano-salicylic acid and nano-curcumin exhibit superior activity against <i>R. solani</i> compared to their conventional forms, highlighting their potential as sustainable, eco-friendly alternatives to synthetic fungicides in crop protection.</p>