Where TCD has been found
Thousand cankers disease occurs in nine Western and five Eastern states (shaded pink); the year in which the disease was confirmed is noted. Since 2010, TCD has been confirmed in Ohio, North Carolina, Pennsylvania, Tennessee, and Virginia. The beetle alone and the pathogen alone have been found in Maryland and Indiana respectively.
The map shows the native ranges of eastern black walnut (dark green). Eastern black walnut is widely planted in the West, but this map does not depict these western locations.