New Perspectives on the Epidemiology of Citrus Stubborn Disease in California Orchards

Fig. 5. Location of citrus orchards and other sites in the San Joaquin and Antelope valleys, CA, where Spiroplasma citri was collected for this study. Each grey square represents 1.61 kg² in which a commercial orchard of 25 or more citrus trees were planted. Yellow areas on the larger map represent the main areas where citrus is grown in San Joaquin Valley. Reprinted with permission from A. F. S. Mello, et al. (9).



Image from Plant Health Progress article:
New Perspectives on the Epidemiology of Citrus Stubborn Disease in California Orchards