Identification of invasive and reemerging pests on hazelnuts

Abstract

Hazelnuts are produced in many countries, including the United States. Hazelnuts are grown on approximately 30,000 acres in the Willamette Valley, accounting for about 99 percent of U.S. production and 5 percent of world production. Turkey produces more than 70 percent of total world hazelnut production. Hazelnut species that occur naturally in the Willamette Valley include the wild native hazelnut, which is found in uncultivated woodland areas as well as in some parks. Wild and cultivated hazelnuts are attacked by similar pests. This publication is intended to increase producer awareness of important pests that occur in hazelnut orchards in the Pacific Northwest.