Using ‘sentinel’ plants to improve early detection of invasive plant pathogens
Fig 4
Optimal reductions in EDP compared to the baseline level.
A. The best achievable percentage changes in the EDP compared to the baseline level for each (N, Δ) pair when PS = 50, corresponding to the optimal strategies identified in Fig 3B. Green circle marks the case considered in Fig 3A (PS = 50, N = 50, Δ = 30 days). Note that the baseline level depends on N and Δ (Fig 2C, S12A Fig), so the relative changes in EDP shown here are not a measure of the resultant EDP. The resultant EDP decreases with sampling effort (S12B, S12C and S12D Fig). B. The analogous figure to A, but with PS = 100 sentinels added to the population and results corresponding to the strategies identified in Fig 3C. C. The analogous figure to A, but with PS = 200 sentinels added to the population and results corresponding to the strategies identified in Fig 3D. D. Combinations of the sample size N and sample interval Δ for which adding PS = 50 (dark green), PS = 100 (light green) or PS = 200 (blue) sentinels to the population led to the greatest reduction in the EDP compared to the baseline level (of the three values of PS considered).