Citrus Canker: The Pathogen and Its Impact

Fig. 48. Map of portion of residential Palm Beach County where the sentinel tree survey method is used to search for citrus canker in dooryards. Yellow squares are one-square-mile sections that have been surveyed. Pink squares are sections remaining to be surveyed during the depicted sweep of the area. Red marks indicate properties with citrus canker-infected trees discovered by survey method.



Image from Plant Health Progress article:
Citrus Canker: The Pathogen and Its Impact