sentences:  The US produces only 4% of hazelnuts, and 99% of it is grown in the Willamette Valley of Oregon, which provides a perfect climate for hazelnut trees.Eastern filbert blight is prevalent in the East, so commercial production of hazelnut in the U.S. was initially successful in the west.However, in the late 1960’s, the disease was detected in Washington state, and eventually it spread to British Columbia, despite efforts to contain it, and was first detected in 2002.