Iris Yellow Spot Virus: A Threat to Seed and Bulb Onion Crops in Idaho

Iris Yellow Spot Virus is a powerful viral pathogen that drastically slows onion growth, leading to major crop loss and higher production costs. It first appeared in Idaho in 1989, but has since spread to other western U.S. states. Learn how to detect the presence of this potentially fast-spreading disease in your plants and how to manage it if it does in this timely four-page bulletin.