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
Baird, Jim CE Specialist turfgrass variety improvement and selection, plant stress physiology related to temperature and water, and natural resource concerns, including water allocation and management, energy conservation, atmospheric quality or other issues at the intersection of turfgrass landscapes with native and production agricultural areas. UC Riverside dept. profile
Bean, Travis CE Weed Science Specialist invasive plant ecology and management UC Riverside  
Becchetti, Theresa Farm Advisor livestock and natural resources UCCE Stanislaus, San Joaquin website
Brim-DeForest, Whitney Rice Advisor rice, weeds UCCE Sutter-Yuba, Butte, Sacramento website
Daugovish, Oleg Strawberry and Vegetable Crops Advisor ag and environmental issues for veg crops and strawberries UCCE Ventura  
Davy, Josh Livestock, Range and Natural Resources Advisor livestock, range and irrigated pasture UCCE Tehama, Colusa, Glenn  
Dean, Ellen Curator taxonomy of flowering plants, ethnobotany, weed identification UC Davis website
Doran, Morgan Livestock and Natural Resources Advisor livestock, beef cattle, sheep, nutrition, range management, irrigated pastures, grazing systems, ranch water quality UCCE Yolo, Napa, Solano, Sacramento 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
Hembree, Kurt Weed Management Farm Advisor weed management strategies in crop and non-crop settings UCCE Fresno 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  
Lloyd, Margaret Small Farms Advisor small farms, organic UCCE Yolo, Solano, Sacramento  
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, Riverside, Imperial, San Diego website
McGiffen, Milt CE Specialist and Plant Physiologist vegetable crops, invasive species, weed science, sustainable agriculture, and alternatives to methyl bromide UC Riverside dept. profile
McGourty, Glenn Viticulture and Plant Science Advisor plant science--all horticultural crops including wine grapes, vegetables; viticulture; nursery and floriculture (ornamentals); landscape; also sustainable agriculture and weed science UCCE Mendocino, Lake  
Mesgaran, Mohsen Professor Weedy and invasive plants in agricultural and natural systems UC Davis  
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  
Pitcairn, Mike Sr. Environmental Research Scientist biological control of weed and insect pests, integrated weed management, and plant population ecology; yellow starthistle, water hyacinth CDFA BioControl Program (Sacramento) website
Reiter, Maggie Environmental Horticulture Advisor Low-input turfgrass management UCCE Fresno, Madera, Tulare, Kings website
Rios, Sonia Area Subtropical Horticulture Advisor subtropical horticulture UCCE Riverside, San Diego  
Roncoroni, John Weed Science Farm Advisor weed control and vegetation management in perennial crops, covercrops, aquatic weed control, IPM UCCE Napa website
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
Sosnoskie, Lynn Agronomy and Weed Science Advisor weed biology, ecology, and management UCCE Merced, Madera website
Steinmaus, Scott Professor weeds in agriculture and invasive plants in wild lands Cal Poly San Luis Obispo website
Stoddard, Scott Vegetable Crops and Limited Resource Farms Advisor soil fertility and conservation, tomatoes, peppers, sweetpotatoes, weed management UCCE Merced, Madera website
Wilen, Cheryl Area IPM Advisor IPM for ornamental plant production and maintenance including nurseries, greenhouses, field production, floriculture, turf and landscape, pesticide reduction and alternatives. Research specialty in weed management, snails & slugs. UCCE San Diego, Los Angeles, Orange website
Wilson, Rob Farm Advisor pest managment in vegetable and field crops; potato variety development; production of potatoes, onions, peppermint, and small grains UCCE Intermountain Research & Extension Center, Tulelake 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
  • 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
  • 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
  • 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
  • Wright, Steve :: Farm Advisor :: UCCE Tulare-Kings :: retired 6/30/2016