Plant Protection...

Hops are susceptible to a wide assortment of viruses, diseases and insects. Each year, cultural practices are refined to better control their spread, and the damage they inflict on the crop. The most severe arthropod pests of hops are Two Spotted Spider Mite and Hop Aphid, which must be controlled annually.  Two major diseases also impact hops - Hop Powdery Mildew and Hop Downy Mildew.  American hop growers are committed to continually improving plant protection programs, working closely with private and university researchers to ensure the quality of every crop.

International Harmonization...

American hop growers rely on export markets for the sale of over 70% of their annual production.  As a result, compliance with plant protection regulatory standards in customer countries is critically important.  By using integrated pest and disease management strategies that rely on weather monitoring, cultural practices, scouting, and reduced-risk pest control agents that have been carefully reviewed and approved by the US Environmental Protection Agency, hop growers seek to produce a high quality crop that will not only meet stringent US requirements, but will also comply with foreign regulatory standards. 

Resources...

Washington State University Extension Pest Management Resource Service

Oregon State University Online Guide to Plant Disease Control

Field Guide for Integrated Pest Management in Hops (PDF file)

Field Guide for Integrated Pest Management in Hops - Pocket Version (PDF file)