An Epidemiological Comparison of the US and Canadian <i>Plum pox virus</i> Eradication Programs

Fig. 3. The distance to 50% (D50) and 95% (D95) of new Plum pox virus-positive Prunus blocks in Pennsylvania plotted over time. Values represent the 50% and 95% quantiles for the minimum distances between PPV-positive Prunus blocks and the nearest PPV-positive Prunus block from the previous year.



Image from Plant Health Progress article:
An Epidemiological Comparison of the US and Canadian Plum pox virus Eradication Programs