Ascochyta blight, caused by A. lentis, is a foliar disease that affects lentil production, particularly in temperate regions, resulting in yield losses of up to 50% during severe outbreaks. Silicon (Si), while not essential, has shown the ability to enhance plant resilience against both biotic and abiotic stresses in various crops. Research indicated Si's potential to improve plant resilience to fungal diseases, offering reassurance regarding the effectiveness of this approach in managing Ascochyta blight in lentils. Therefore, a growth chamber study was conducted to assess the impact of Si on Ascochyta blight disease progression. The susceptible lentil cultivar, ILL6002, was grown in a potting mix supplemented with different Si concentrations (1, 2, 3, 4 and 5 mM /L) and inoculated with A. lentis. The results showed that increased silicon application substantially reduced disease severity at 21 days post inoculation (dpi), although this trend did not persist one week later at 28 dpi. The lowest severity (20.33%) was observed at 21 dpi with the plants that received 5 mM/L of Si treatment, while symptoms increased to 39.38% after a week with the same treatment. Likewise, similar tendencies were noted in other silicon treatments with disease severity, except for plants that received a 3 mM/L concentration of Si. Plants treated with 3 mM/L of Si showed a 2.28% decrease in disease severity between 21 and 28 dpi. This further indicated that the day of disease assessment also had a considerable impact, reflecting significant implications of Si over time with disease progression. Additionally, the negative correlation supports an inverse relationship between Si application rate and disease severity. Furthermore, the interaction between Si application rate and disease assessment time was noteworthy, implying varying effects of Si on disease severity and progression. Overall, Si application enhanced resistance in a lentil-susceptible genotype against A. lentis in a dose-dependent manner. However, a further metabolomic assessment can determine the underlying role of Si in managing the A. lentis pathogen in lentils and potentially uncover new strategies for disease management.