Fig. 9
From: Phony peach disease: past and present impact on the peach industry in the southeastern U.S.A
Distribution of phony peach disease (PPD, caused by Xylella fastidiosa subspecies multiplex) by surveyed county in Georgia (U.S.) in 1929 (left) and 1930 (right), the first two years of the survey and eradication program. The size of the circle is a direct representation of the documented percent of infected trees per county (PPD incidence). A red, open circle means no PPD was detected. PPD incidence was 0–10.9% and 0–10.5% in 1929 and 1930, respectively. Data is derived from the Georgia State Board of Entomology Biennial Report of the State Entomologist for 1929–1930 Bulletin 75