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A field full of dandelions during sunset.

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Participants of Weed Day 2026 labeling types of weeds in a field.

Weed Day 2026

  • by Sam Romano

It's finally June, so it's time for another Weed Day!

Earn up to 5.0 hours of "Other" CEUs through the California Department of Pesticide Regulation by attending Weed Day 2026.

Weed Day is a showcase of the latest weed science research at the University of California. This year, we'll have demonstrations of a variety of weed control technologies during the morning field tour. After a buffet lunch and open discussion period, we'll have presentations in the afternoon for research projects that are either off-season or too far from campus for viewing.

Field Chemigation for Branched Broomrape Management in California Processing Tomato

  • by Rohith Vulchi and Brad Hanson

Branched broomrape (Phelipanche ramosa) poses a significant challenge to processing tomato production in California. Unlike many other weeds growers manage, broomrape spends nearly 70% of its entire life cycle underground attached directly to tomato roots, before ever becoming visible. By the time shoots emerge above the soil surface, the plant has already been established belowground for weeks. Once it emerges, it can flower and produce seed within a couple of weeks.

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