Figure 4 Ash tree
distribution and EAB presence in China from 1900 to 2019. (a) The green
background indicates the range of native Asian ash species which are
widely distributed in all 34
provinces, provincial cities, or
regions in China. Red, black, yellow, and blue quadrants indicate
locations where exotic green, white, velvet, or European ash trees were
planted, respectively. Black circles indicate the presence of EAB
infestations. (b) Relationships between the plantings of non-Asian ash
trees and EAB outbreak in China from 1900 to 2019. The insert figure
represents an enlarged display of ash plantings from 1900 to
1970.