Optimal Application Timing of Pest Control Tactics in Nonautonomous Pest Growth Model

Figure 1

Illustration of the existence of the minimal value point. The parameter values are fixed as follows: 𝑟(𝑡)=1.5+0.3cos(0.4𝜋𝑡), 𝑏(𝑡)=1+0.2sin(0.4𝜋𝑡), 𝛿(𝑡)=0.5+0.1cos(0.4𝜋𝑡), 𝜎₁=0.5, and 𝑝₁=0.25.