UC Weed Science (weed control, management, ecology, and minutia)

UC Davis and UC Cooperative Extension will host the UC Dry Bean Field Day on Thursday, August 13, 2026 from 9:30am to 12:00pm. The field day will begin along Bee Biology Road on the UC Davis campus where attendees will have the opportunity to view research plots. UCCE sandwich board signs will be set up…

Johnsongrass (Sorghum halepense L.) is a problematic perennial weed that plagues California orchards and vineyards, spreading through seed production and perennial rhizomes. Established johnsongrass populations are typically controlled through use of systemic post-emergent herbicides (typically glyphosate…

Field Chemigation for Branched Broomrape Management in California Processing TomatoRohith Vulchi and Brad Hanson, Plant Sciences Department, UC Davis  Branched broomrape (Phelipanche ramosa) poses a significant challenge to processing tomato production in California. Unlike many other weeds growers…

Over the past few years, a host of studies have been published addressing the rejuvenation of perennial grass stands in unirrigated pastures through use of herbicide treatments (check here, here, and here). This is for good reason, as annual weeds can invade productive perennial grass ecosystems and reduce…

Rohith Vulchi and Brad Hanson, Plant Sciences Department, UC DavisBranched broomrape is a parasitic weed that continues to challenge processing tomato production in California. Nearly 70% of its lifecycle is completed underground; once it emerges, it can flower and set seed within just a few weeks. Current…