This research demonstrates how beneficial bacteria can be used to naturally protect oak tree seedlings from disease while helping them grow better. The study found that a specific bacterial strain (B. velezensis CE 100) could both fight off harmful fungi and promote healthier plant growth, offering an environmentally friendly alternative to chemical treatments. Impacts on everyday life: • Provides a safer, chemical-free method for growing healthy forest trees • Helps ensure more successful reforestation efforts for environmental conservation • Demonstrates sustainable alternatives to chemical pesticides in plant cultivation • Contributes to more efficient and eco-friendly forestry practices • Could lead to better survival rates for newly planted trees in urban and rural settings