Passionate about saving American elms Portland News - – OregonLive.com:
A virulent fungus has been slowly killing the city's majestic American elms.
But careful pruning and tree inoculations by citizens groups and urban foresters during the past decade have kept losses to an acceptable number, says city arborist Rob Crouch.
'We've slowed the spread to about 30 trees a year, which is a reasonable rate for a city this size,' Crouch says. 'We may lose all of the elms eventually, but with the numbers on private and public land, it could take about 100 years for all of them to disappear.'