Need Help Diagnosing a Disease?

Dealing with a difficult soilborne disease issue? Start by contacting your local Farm Advisor. They can visit your field and help submit a sample to the UC Davis diagnostic laboratory run by the Swett team.

The lab provides the diagnostic foundation for much of California’s tomato fungal-disease research. The field-level recommendations developed through CTRI-funded projects often begin with the work conducted there. Support from CTRI grower members helps make this tomato diagnostic and research capacity possible.

Not sure which Farm Advisor to contact? Scroll to the bottom of our Grower Resources page for a county-by-county contact list.

Fusarium Stem Rot and Decline (FRD) Resources

Seeing FRD in a field this season? The resources below can help you plan for the next time tomatoes are planted there, including variety selection, crop rotation and other management options. The resources below reflect several years of ongoing research, with updated results expected after the 2026 harvest.

We build durable coalitions around the questions whose answers drive the long term success of the California processing tomato industry. Founded in 1968, the CTRI is a non-profit organization of processing tomato growers.