In the modern era, plant pest is a significant problem. Many options are available, including chemical remedies and ones based on natural enemies. In this work, we discuss the dynamics of infected pests on plants. We have suggested that Belington-DeAngeli functional responses in pests cause infection spread. Because natural enemies are disappearing at an alarming rate and chemicals are hazardous to both plant life and humans, that's the reason for choosing the model with diseased pests. In this study, the existence, uniqueness, boundedness, and non-negativity for the solution of the model have been carried out. Analysis of the equilibrium point's local and global stability and numerical simulation have been done at the end of this work.