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

Figure 4

Illustrations of existences of 𝜏_𝑖min(𝑖=1,2). The parameter values are fixed as follows: 𝑏(𝑡)=1+0.2sin(0.7𝜋𝑡), 𝛿(𝑡)=0.5+0.1cos(0.7𝜋𝑡), 𝜎₁=0.5.