infestations in Oregon have been detected in Clackamas
and Washington counties. Infected orchards have also been
discovered as far west and as far east of Portland as
hazelnuts are grown (see map below).
Many infected orchards have been found to the south of
Wilsonville including a hot spot next to Keizer, OR. Several
infected trees have also been found to the south of
Amity, OR along 99W and in the Silverton area. Infected
orchards have already been found near Dayton, West Salem and Mt.
During 2003 we found a major infection center in the
Thurston, OR area. Many orchards and fence row trees were found to be
infected indicating the disease had been there for 7-10 years. An Ennis
orchard just north-west of Springfield was also heavily infected
indicating EFB had been there 5-7 years. Less severe infections were found
in the Dever-Conner area north of Albany, OR, south of Harrisburg, OR and
in south Springfield.
Many more infected trees and new orchards have been found since
then in the Dever-Conner
area, at the OSU Research farms just east of
Corvallis, OR and throughout the greater Eugene and Springfield area.
EFB is expected to spread throughout the Willamette Valley
in the next few years.
Animated maps that show the
progress of this disease through the main
hazelnut production areas of the Pacific Northwest from 1958 to 2005
have been developed. A survey map shows the location of infected
orchards or nursery stock as they were actually discovered while a
biology map shows the same information but modified to when we think
Another interesting sample of eastern filbert blight was
sent in from an Ennis orchard on the Washington side of the USA - Canada
border in 2000. The area north of there has been scouted intensively for
this disease since the 2000-2001 dormant season. EFB has been found in at
least 2 commercial orchards and in many non-orchard sites in British
Eastern Filbert Blight
has been found in many orchards from north of Vancouver, WA
south through the Willamette Valley to Eugene, OR. The
location of infected orchards is displayed as red dots while
the location of infected ornamental or orchard stock is shown
as blue dots.
Map by Jay W. Pscheidt and
Pat Grimaldi, 2006