Figure 4From: A fractional order pine wilt disease model with Caputo–Fabrizio derivativeSimulations of pine tree population (a)–(c) and vector population (d)–(f) of the FPWD model (9) for \(\tau=0.4\). (a): Susceptible pine tree; (b): Exposed pine tree; (c): Infected pine tree; (d): Susceptible vector; (e): Exposed vector; (f): Infected vectorBack to article page