Oregon's Willamette Valley is home to 99% of the U.S. domestic production of hazelnuts, Corylus avellana. There are currently around 30,000 acres of hazelnuts in Oregon. Hazelnuts are a relatively low resource input crop when compared to other orchard crops. They require few pesticide applications, and are harvested mechanically. Oregon State Univ. (OSU) developed an Integrated Pest Management (IPM) program for hazelnuts in the middle 1980s that is widely adopted in the industry today. Sampling schemes and action thresholds have been developed for the filbertworm (the most important insect pest), as well as: obliquebanded leafroller, filbert leafroller, and filbert aphids. In an example of classical biological control, a filbert aphid parasite, Trioxysis pallidus, was imported from Europe in 1984. Trioxysis has successfully established itself throughout the industry. As a result, the need for aphid control sprays has been significantly reduced. Current research in hazelnut IPM is focused on a “soft pesticide” program that features an insect growth regulator for filbertworm control. Recent research with isotopically labeled nitrogen seeks to improve the efficiency of nitrogen fertilization in the industry. The northern portion of the industry is affected by Eastern Filbert Blight. OSU research has secured registrations of effective fungicides and refined the control program for the blight. Work is being completed on a predictive model to quantify the extent of spore dispersal, based on accumulated rainfall.