Be sure to check out the Stop the Rot playlist on YouTube

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

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.

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.


2022 Annual Onion Research Meetings in Denver, CO

Please join us on February 28th and March 1st 2022, for a joint meeting of the W3008 Multistate Onion Research Project, the National Allium Research Conference, and the ‘Stop the Rot’ SCRI onion bacteria research project.

See the meeting page for more information and registration links.


NOA Winter Meeting in Puerto Rico, December 1-4, 2021.
More information

NARC (National Allium Research Conference)
February 28, 2022, in Denver CO., Save the date!

W3008 Multistate Research Project annual meeting
February 28, 2022, in Denver CO. More information coming soon.

More items on the Calendar