Weed Research and Information Center

About the Center

Mission statement

The Weed Research and Information Center is an interdisciplinary collaboration that fosters research in weed management and facilitates distribution of associated knowledge for the benefit of agriculture and for the preservation of natural resources.


Contact us

Mailing address:
University of California, Davis
Dept. of Plant Sciences, MS4
One Shields Avenue
Davis, CA 95616

Phone: (530) 752-1748
E-mail: wric@ucdavis.edu


Kassim Al-Khatib
Director, UC Weed Research and Information Center

Gale Perez
Program Representative, UC Weed Research and Information Center

Weed Scientists

    Specialty Campus/County  
Al-Khatib, Kassim Professor and CE Weed Science Specialist herbicide resistance, integrated weed management, rice weed management, herbicide drift, off-target herbicide movement, herbicide mode of action, herbicide physiology, herbicide symptomology, herbicide tolerant crops, weed physiology, herbicide damage UC Davis website
Brim-DeForest, Whitney Rice and Wild Rice Advisor rice, weeds UCCE Sutter-Yuba, Capitol Corridor, Placer, Nevada website
Colwell, Alison Curator Orobanchaceae, flora of Yosemite, California rare plants UC Davis website
Daugovish, Oleg Strawberry and Vegetable Crops Advisor ag and environmental issues for veg crops and strawberries UCCE Ventura  
Dias, Josť Luiz Carvalho de Souza Agronomy and Weed Management Advisor forage and silage crops, alfalfa, small grains, grain corn, dry beans, and cotton UCCE Merced, San Joaquin, Stanislaus website
Eviner, Valerie Professor and Ecologist understanding of plant-soil interactions to increase our understanding and effective management of: ecosystem services, plant invasions, restoration, plant community composition, biogeochemical cycling, global change, grazing systems, and resilience of ecosystem structure and function UC Davis website
Fennimore, Steve CE Weed Science Specialist weed control in cool-season vegetables, weed biology, weed seed germination UC Davis (located in Salinas) website
Getts, Tom Weed Ecology and Cropping Systems Advisor weed ecology and cropping systems UCCE Lassen, Modoc, Plumas, Sierra website
Grewell, Brenda Research Ecologist plant biology and ecology; ecology of biological invasions that contribute to the development of ecologically-based and environmentally benign management strategies for invasive aquatic; wetland and riparian plants in the Pacific West that will reduce undesired impacts on non-target organisms and the environment USDA-ARS Invasive Species and Pollinator Health (UC Davis)  
Hanson, Brad CE Weed Specialist weeds, weed control, herbicide resistance, weed biology, invasive plants, pest control in fruit and nut crops and other agricultural production systems UC Davis website
Jasieniuk, Marie Professor population genetics, molecular ecology, and evolution of agricultural weeds and invasive plants UC Davis website
Kyser, Guy Specialist invasive plants of non-crop environments UC Davis  
Light, Sarah Area Agronomy Advisor alfalfa/hay, beans, wheat, grains, corn, sorghum, barley, sunflower, safflower, oil seed (canola, soybean), pseudo-cereal (buckwheat, chia, quinoa, amaranth) UCCE Sutter-Yuba website
Madsen, John Research Biologist biology, ecology and management of aquatic weeds, with an emphasis on the life history analysis of invasive plants and selective management to assist in the recovery or preservation of native plant communities USDA-ARS Invasive Species and Pollinator Health (UC Davis) website
McDonald, Chris Inland and Desert Natural Resources Advisor invasive plants, weeds, native plant restoration, vegetation management UCCE San Bernardino, Imperial, Riverside, San Diego website
Mesgaran, Mohsen Professor weedy and invasive plants in agricultural and natural systems UC Davis  
Mosqueda, Elizabeth        
Oneto, Scott Farm Advisor rangeland management, weed science, home horticulture, livestock UCCE Amador, El Dorado, Tuolumne, Calaveras  
Ozeran, Rebecca Livestock and Natural Resources Advisor   UCCE Fresno, Madera  
Rao, Devii Area Livestock and Natural Resources Advisor rangeland ecology and management, rangeland conservation, grazing management, conservation of biological diversity, watershed protection and management UCCE San Benito, Monterey, Santa Cruz  
Rios, Sonia Area Subtropical Horticulture Advisor UCCE Riverside, San Diego
Shrestha, Anil Associate Professor IPM in ag and non-ag systems, weed biology and ecology, crop-weed competition, herbicide-resistance management, environmental aspects of vegetation management, cropping systems, agroecology, conservation tillage, and organic farming CSU Fresno website
Smith, Richard Vegetable Crop Production and Weed Science Farm Advisor vegetable crop production and weed science UCCE Monterey, San Benito, Santa Cruz website
Steinmaus, Scott Professor weeds in agriculture and invasive plants in wild lands Cal Poly San Luis Obispo
Stoddard, Scott Vegetable Crops and Limited Resource Farms Advisor soil fertility and conservation, tomatoes, peppers, sweetpotatoes, weed management UCCE Merced, Madera website
Windbiel-Rojas, Karey Area IPM Advisor urban IPM UCIPM / UCCE Yolo, Capitol Corridor website
Wilson, Rob Farm Advisor pest managment in vegetable and field crops; potato variety development; production of potatoes, onions, peppermint, and small grains UC ANR Intermountain Research & Extension Center website


Retired Weed Scientists

  • Ashton, Floyd :: Professor :: Dept. of Botany, UC Davis :: retired 6/30/1988
  • Anderson, Lars :: Plant Physiologist :: USDA-ARS Exotic & Invasive Weed Research Unit :: retired 12/31/2011
  • Bean, Travis :: CE Weed Science Specialist :: UC Riverside :: passed away May 2020
  • Bell, Carl :: Regional Advisor :: UCCE San Diego :: retired 2014
  • Canevari, Mick :: Farm Advisor :: UCCE San Joaquin :: retired 6/29/2009
  • Cudney, Dave :: CE Weed Ecologist :: UC Riverside
  • DiTomaso, Joe :: CE Weed Specialist :: Dept. of Plant Sciences, UC Davis :: retired 6/30/2017
  • Elmore, Clyde :: CE Weed Specialist :: Dept. of Vegetable Crops, UC Davis :: retired 2002
  • Fischer, Albert :: Professor :: Dept. of Plant Sciences, UC Davis :: retired 2/13/2016
  • Hembree, Kurt :: Farm Advisor :: UCCE Fresno :: retired 6/30/2020
  • Hill, Jim :: CE Specialist :: Dept. of Plant Sciences, UC Davis :: retired 2015
  • Holt, Jodie :: Professor :: Dept. of Botany & Plant Sciences, UC Riverside :: retired 2015
  • Lanini, Tom :: CE Weed Specialist :: Dept. of Plant Sciences, UC Davis :: retired 2013
  • Le Strange, Michelle :: Farm Advisor :: UCCE Tulare-Kings :: retired 2014
  • Marcum Dan :: Farm Advisor :: UCCE Shasta-Lassen :: retired 2013
  • Molinar, Richard :: Farm Advisor :: UCCE Fresno :: retired 2013
  • Munier, Doug :: Farm Advisor :: UCCE Glenn-Butte :: retired 6/27/2013
  • Norris, Robert :: Professor :: Dept. of Vegetable Crops, UC Davis :: retired 2001
  • Orloff, Steve :: County Director and Farm Advisor :: UCCE Siskiyou :: passed away 10/2017
  • Pitcairn, Mike :: Senior Environmental Research Scientist :: CDFA Biocontrol Program :: retired 2020
  • Roncoroni, John :: Farm Advisor :: UCCE Napa :: retired 6/30/2020
  • Schmierer, Jerry :: Farm Advisor :: UCCE Colusa-Glenn-Sutter-Yuba :: retired 4/30/2011
  • Spencer, Dave :: Ecologist :: USDA-ARS Exotic & Invasive Weed Research Unit :: retired 1/3/2015
  • Vargas, Ron :: Farm Advisor :: UCCE Madera :: retired 6/30/2006
  • Wilen, Cheryl :: Area IPM Advisor :: UCCE San Diego-Orange-Los Angeles :: retired 4/ 2020
  • Wright, Steve :: Farm Advisor :: UCCE Tulare-Kings :: retired 6/30/2016