Publications for:

pest = Phlyctema vagabunda
crop = Ash (Fraxinus)

found 2 publications:

2005

Phlyctema vagabunda causes coin canker of ash (Fraxinus spp.) in North America
Plant Disease (2005) 89 (7), p.773
publishers website - pestinfo wiki

2002

Phlyctema vagabunda isolated from coin canker of ash trees in Michigan
Plant Disease (2002) 86 (4), p.442
publishers website - pestinfo wiki