Visit UI

Learn about the many reasons the University of Idaho could be a perfect fit for you. Schedule Your Visit

Student Life

Fill your college experience with memories and connections that will define you as an individual and empower you for a lifetime. Explore

Parent Newsletter

Keep up on campus events and information involving your Vandal student. Sign Up

UI Retirees Association

UIRA has a membership of nearly 500 from every part of the University. Join Today

Onions Publications & Resources

Internal Dry Scale and Associated Bulb Rots of Onion > PDF
Onion growers and packers in the Pacific Northwest have observed a problem on red, white, and yellow cultivars: internal dry scale. Bulbs affected by internal dry scale have dead inner scales that are . . . . . more details

Nematodes Associated with Onion in Idaho and Eastern Oregon > PDF
The most common nematodes on onion in Idaho and eastern Oregon are root-lesion nematodes (Pratylenchus spp.), root-knot nematode (Meloidognye hapla), stem nematode (Ditylenchus d . . . . . more details

Nitrogen Uptake and Utilization by Pacific Northwest Field Crops > PDF
This publication provides information on the timing and pattern of biomass accumulation and nitrogen (N) uptake for a variety of Pacific Northwest crops. Authors: D.M. Sullivan, J.M. Hart, and N.W. Ch . . . . . more details

Nutrient Management for Onions in the Pacific Northwest > PDF
Based on data accumulated over many growing seasons and from many varieties grown in Idaho, Oregon, and Washington, this nutrient management guide assists onion growers and crop advisers in producing . . . . . more details

Pit Disposal of Cull Onions > PDF
Describes the management practices that prevent leaching of nitrogen from cull onion burial pits, including site selection, pit development, loading and disposal of cull onions in pits, pit maintenanc . . . . . more details

Southern Idaho Fertilizer Guide: Onions > PDF
This publication offers fertilizer guidelines based on relationships between soil tests and yield responses of onions. The fertilizer rates are designed to produce above-average yields. It offers info . . . . . more details


Contact Information

select office to view website - or - select name to email

University of Idaho Extension


Physical Address:
E. J. Iddings Agricultural Science Laboratory, Room 10
606 S Rayburn St

Mailing Address:
875 Perimeter Drive MS 2332
Moscow, ID 83844-2332

Phone: 208-885-7982

Fax: 208-885-9046



Barbara Petty