Be sure to check out the bacterial Stop the Rot playlist on Vimeo! 

Welcome to Alliumnet!

We are an organization focused on the production of allium species in the United States.

On our website, you will find information on the latest research, resources for diagnosing diseases and problems, links to regional extension resources, and grower associations’ notices about upcoming scientific meetings and archives of prior research meetings.

About Onions in the USA

Onion, Allium cepa L., is the third most consumed vegetable in the U.S.A, behind tomato and potato. The per capita consumption of onions in the U.S. is about 20 pounds per year, which has increased 70% over the… read more

About Alliumnet

Alliumnet is a collaborative effort focused on supporting the production of allium species in the United States.

Find information resources for researchers, extension staff, and producers on… read more

Upcoming & Recent Meetings

NOA Winter Meeting, Nov 30-Dec 5, 2025, Kaua’i, Hawaii

NARC National Allium Research Conference, Nov 30-Dec 5, 2025, Kaua’i, Hawaii

The 2025 National Allium Research Conference (NARC) will be held together with the National Onion Association’s (NOA) winter meeting from Sunday, Nov 30, to Friday, Dec 5, 2025, at the Royal Sonesta Hotel, Kaua’i, Hawaii.

News and Recently Added Content

Novel species of pathogenic bacteria of onion identified in Texas

We’re sad to announce the passing of our colleague Steve Beer, Professor Emeritus at Cornell University. Please see the obituary here.

Stop the Rot researchers recently published several new Plant Disease Management Reports on the results of field trials in the first season of work. Reports are now available from three participating states (GA, WA, NY). Click Here to see the most current version of the Plant Disease Management Reports list.

Washington State Extension – WSU Onion Alerts, 2021: Issue 3

MacKay, H., and du Toit, L. 2021. Progress report. Stop the Rot: A national collaboration to research, combat bacterial diseases of onion. Onion World, May/June 2021:12-14. https://issuu.com/columbiamediagroup/docs/onion_world_may_june_2021/12

du Toit, L., and Waters, T. 2021. To disinfect or not? Can postharvest applications of disinfectants reduce bacterial bulb rots in storage? Onion World, July/August 2021:6-9. Onion World Magazine July/August 2021

du Toit, L.J., Waters, T., Derie, M., and Darner, J. 2020. Battling onion bacterial diseases with bactericides. Onion World, December 2020:6-11. https://issuu.com/columbiamediagroup/docs/onion_world_december_2020