Optimal Control Policies of Pests for Hybrid Dynamical Systems

Figure 7

The effects of times of releasing natural enemies and releasing constant 𝜃 on the threshold level 𝜆₂. The parameter values are as follows:  𝛿₁=0.92,  𝛿₂=0.93,  𝛿₃=0.92,  𝜇=0.99,  𝑇₁=5,  𝑑=0.25,  𝑟=1.2,  𝑐=0.3,  𝑎₁=0.8, and  𝛼₂=0.7.