Foliar pathogens are among the main limitations of pea ( Pisum sativum L.) crops causing losses between 20 and 100%. The application of biostimulants such as silicon (Si) has been reported as an alternative for disease management; however, information on their use in peas is still limited. In this research, the effect of edaphic and foliar applications of basic and acidic Si on the severity of diseases caused by Ascochyta spp., Peronospora Viciae, and Erysiphe Pisi was evaluated under field conditions. Additionally, the chlorophyll content, stomatal conductance (gs), photosynthetic pigments, relative growth rate (RGR), plant height, and crop yield components were determined. The applications of acidic or basic Si showed the lowest levels of severity of the evaluated diseases, without affecting crop yield and quality. The treatments with an edaphic application of acidic Si showed greater efficacy compared to the application of basic Si and foliar treatments. The results obtained contribute to the search for alternatives for disease management and the reduction of the use of fungicides in pea crops.