Figure 4From: A pest control model with birth pulse and residual and delay effects of pesticides(a) The effect of the pest’s net uptake rate r of pesticide from the environment on the threshold \(R_{0}^{b}\), \(h=0.2\). (b) The effect of the pesticide loss rate h from the environment itself on the threshold \(R_{0}^{b}\), \(r=0.2\). The other parameters are \(b=20\), \(\mu =0.4\), \(d=0.4\), \(\delta =0.6\), \(g=0.1\)Back to article page