Citrus Huanglongbing: The Pathogen and Its Impact

Fig. 25. Plot map of the Shantou HLB epidemiology plot in China (PRC). Vegetable garden was located to south with 6 to 7 HLB-infected trees that existed prior to establishment of the commercial citrus planting. White dots indicate position of mandarin citrus trees. Red dots indicate initial visual assessment of spatial distribution of HLB (16 infected trees) in 1986. Larger white dots indicate distribution of HLB in 1988, 7,425 HLB-infected trees, small white dots are visually non symptomatic trees.



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