A parallel situation occurred in eastern Colorado during the early 2000s where unexplained black walnut deaths were observed in several sites (Colorado Springs, Boulder, Westminster) and walnut twig beetles were subsequently recovered in 2004, which constituted a new state record for the species.
A parallel situation occurred in eastern Colorado during the early 2000s where unexplained black walnut deaths were observed in several sites (Colorado Springs, Boulder, Westminster) and originally thought to be associated with drought. Walnut twig beetles were subsequently recovered in 2004, which constituted a new state record for the species.