John: I think you have been hearing about the emerald ash borer (EAB) a truly devastating insect that was found in the Forest Grove/Hillsboro area several. years ago. EABs have wiped out much of the Ash trees in the Central states and the east coast. It is not at all nice. Control is difficult and very expensive. Their range is expanding and they will probably arrive within 5 years or sooner in Columbia county. It will attack both our native ash trees and non-native ornamental ash trees. They don't do much damage to other species of trees, mostly ashes. Here is a link to information on this problem: https://extension.oregonstate.edu/catalog/pub/em-9380-oregon-ash-insects-pathogens-tree-health#pathogens I hope this helps you understand what is going on. Chip Bubl, Retired OSU Extension Agent for Columbia County