Albert Fischer

image of Albert Fischer

Professor, Weed Ecophysiology in Rice


Plant Sciences

Offices and Labs

279 Robbins
(530) 752-7386


1989 PhD Crop and Weed Science Oregon State University
B.S. - University of Uruguay - Agricultural Science
M.S. - Oregon State University - Crop and Weed Science

Research Contribution

Weeds are a major constraint to food production worldwide causing serious yield and quality losses in all kinds of crops. Thus, weed interference with crops usually prompts for intensive herbicide use, which can become a threat to the environment and human health, and result in high production costs to farmers. Rice is one of the most relevant agronomic crops in California and in the world, and weeds are perhaps the major constraint to rice production worldwide. My research contributes to alleviate the burden of weed control and increase rice production through strategic science that is translated into environmentally compatible solutions for weed management in rice.

Research Interests

Herbicide resistance and weed ecophysiology

My strategic and applied research addresses critical weed challenges to California rice production, such as the evolution of herbicide resistance in major weeds and the recent appearance of weedy forms of rice, which threaten the sustainability of this crop. My program works towards: a) understanding the physiological, biochemical, and molecular mechanisms endowing herbicide resistance in key weeds of rice, b) elucidating effects of landscape and crop management on the genetic structure and the spread of herbicide resistant weeds in rice, c) developing knowledge on weed biology and the ecophysiology of rice-weed interactions, and d) developing novel weed management concepts for rice. My program integrates a wide range of research activities whereby basic science supports novel concepts for field-level solutions.


Mel Androus Professorship for Weed Science in Rice
Charter member Gamma Sigma Delta
President International Weed Science Society

Department and Center Affiliations

Department of Plant Sciences


International Weed Science Society (President), Weed Science Society of America, California Weed Science Society, Agronomy Society of America, Rice Technical Working Group

Specialties / Focus

Plant Biology
  • Environmental and Integrative Biology


Fischer Lab
  • Rocío Alarcón-Reverte, Postdoctoral Alejandro García, PhD Student Whitney Brim-DeForest, PhD Student Rafael Pedroso, MS Student Ibrahim Abdallah, Visiting Scientist, Assist. Prof. Cairo University, Egypt. James W. Eckert, Staff Research Associate Steven Johnson, Staff Research Associate

Field Sites

Cooperative Rice Experiment Station

Teaching Interests

I teach three undergraduate and one graduate courses.
1. I co-teach the core weed science course for undergraduates. It covers most aspects of modern weed science and invasive weeds, emphasizing on concepts, while providing also substantial information for real life weed control.
2. I co-teach an introductory course for freshmen that links basic plant biology and modern agricultural knowledge to the role of plants in society, food security, social implications, and the global environment. It provides Social Sciences, Writing, and Cultural Diversity GE credits.
3. I also co-teach a plant physiology/metabolic processes course, which is part of the upper division PLS100 series required for the new Plant Sciences major and was offered for the first time in Fall 2008. The course emphasizes on the relationships between environmental resources, plant metabolism, and plant growth within managed ecosystems.
4. My graduate-level course examines plant physiology through in-depth study of the mode of action and fate of herbicides and discusses environmental implications of herbicide use.


PLS/SAS 12 Plants and People (Winter)
PBI 212 Herbicide Mode of Action (Spring)
PLS 176 Introduction to Weed Science (Winter)
PLS 100A Metabolic Processes of Cultivated Plants (Fall)

Personal Interests

Sailing, photography, travel, nature website


9/12/2013 9:10:20 AM
  • Pavlovic, D., S. Vrbnicanin, D. Bozic, and A.J. Fischer. 2008. Morpho-physiological traits and atrazine sensitivity in Chenopodium album L. Pest Management Science 64:101-107.
  • Linquist B., Fischer, A., Godfrey L., Greer C., Hill J., Koffler K., Moeching M., Mutters R., and van Kessel C. 2008. Minimum till Could benefit California rice farmers. California Agriculture 62:24-29.
  • Yasuor, H., P.L. TenBrook, R. S. Tjeerdema, and A. J. Fischer. 2008. Responses to clomazone and 5-ketoclomazone by Echinochloa phyllopogon resistant to multiple herbicides in Californian rice fields. Pest Management Science 64:1031–1039
  • Figueroa, R., M. Gebauer, A. Fischer, and M. Kogan. 2008. Resistance to bensulfuron-methyl in water plantain (Alisma plantago-aquatica) populations from Chilean paddy fields. Weed Technology 22:602-608.
  • Merotto, A., M. Jasieniuk, M.D. Osuna, F.Vidotto, A. Ferrero, and A.J. Fischer. 2009. Cross-resistance to herbicides of five ALS-inhibiting groups and sequence of the ALS gene in Cyperus difformis L. J. Agric. Food Chem. 57:1389-1398.
  • Yasuor, H., M.D. Osuna, A. Ortiz, N. E. Saldaín, J.W. Eckert, and A.J. Fischer. 2009. Mechanism of resistance to penoxsulam in late watergrass [Echinochloa phyllopogon (Stapf) Koss.]. J. Agric. Food Chem. 57:3653–3660.
  • Merotto, Jr., A., A.J. Fischer, and R.A. Vidal. 2009. Perspectives for using light quality knowledge as an advanced weed management ecophysiological tool. Planta Daninha 27:407-419.
  • Merotto, A., M. Jasieniuk, and A.J. Fischer. 2009. Estimating the outcrossing rate of smallflower umbrella sedge (Cyperus difformis L.) using resistance to ALS-inhibiting herbicides and SRAP molecular markers. Weed Research 49, 29–36.
  • Merotto Jr., A., M. Jasieniuk and A. J. Fischer. 2010. Distribution and cross-resistance patterns of ALS-inhibiting herbicide resistance in smallflower umbrella sedge (Cyperus difformis). Weed Sci. 58:22-29.
  • Fischer, A.J., G. L. Strong, K. Shackel, and R. G. Mutters. 2010. Temporary drought can selectively suppress Schoenoplectus mucronatus in rice. Aquat. Bot. 92:257-264.
  • Lundy, M., A. Fischer, C. van Kessel, J. Hill, M. Ruark, and B. Linquist. 2010. Surface applied calcium phosphate stimulates weed emergence in flooded rice. Weed Technol. DOI: 10.1614/WT-D-09-00082.1
  • Yasuor, H. W. Zou, V.V. Tolstikov, R.S. Tjeerdema, and A. J. Fischer. 2010. Differential oxidative metabolism and 5-Ketoclomazone accumulation are involved in Echinochloa phyllopogon resistance to clomazone. Plant Physiol. 153:319-326.
  • Gealy, D., and A. Fischer. 2010. 13C discrimination: a stable isotope method to quantify root interactions between C3 rice (Oryza sativa) and C4 barnyardgrass (Echinochloa crus-galli) in flooded fields. Weed Sci. DOI: 10.1614/WS-D-09-00053.1
  • Zhou, W., H. Yasuor, A.J. Fischer, V. Tolstikov. 2011. Trace metabolic profiling and pathway analysis of clomazone using liquid chromatography coupled with triple Quadruple-Linear Ion Trap Mass Spectrometry in Predictive Multiple Reaction Monitoring Mode. LGCC Noth America 29 (9)8p (
  • Yasuor, H., M. Milan, J.W. Eckert, and A.J. Fischer. 2011 Quinclorac Resistance: a concerted hormonal and enzymatic effort in Echinochloa phyllopogon.Pest Management Science ((; DOI 10.1002/ps.2230)
  • Osuna, M.D., M. Okada, R. Ahmad, A. J. Fischer, and M. Jasieniuk. 2011. Genetic diversity and spread of thiobencarb resistant early watergrass (Echinochloa oryzoides) in CaliforniaWeed Science 2011 59:195–201
  • Yasuor, H., M. Milan, J.W. Eckert, and A.J. Fischer. 2011. Quinclorac Resistance: a concerted hormonal and enzymatic effort in Echinochloa phyllopogon. Pest Management Science 68:108-115.
  • Zhou, W., H. Yasuor, A.J. Fischer, V. Tolstikov. 2011. Trace metabolic profiling and pathway analysis of clomazone using liquid chromatography coupled with triple Quadruple-Linear Ion Trap Mass Spectrometry in Predictive Multiple Reaction Monitoring Mode. LGCC North America 29 (9)8p (
  • Ortiz, A. L. Villarreal, S. Torres, M. D. Osuna, L. López, R. Figueroa, C. Zambrano, M. Cásares y A. Fischer. 2012. Resistencia de Fimbristylis miliacea al herbicida pirazosulfurón-etilo en campos de arroz del estado Guárico-Venezuela [Resistance of Fimbristylis miliacea to the herbicide pirazosulfuroon-ethyl in rice fields of the state of Guárico in Venezuela]. Interciencia 37:209-214.
  • Boddy, L.G., J.C. Streibig, Y. Yamasue, A.J. Fischer. 2012. Biomass, fecundity and interference ability of multiple herbicide-resistant and - susceptible late watergrass (Echinochloa phyllopogon). Weed Science. (doi: 10.1614/WS-D-11-00150.1).
  • Pittelkow, C.M. , A.J. Fischer, M.J. Moechnig, J.E. Hill, K.B. Koffler , R.G.Mutters, C.A. Greer, Y.S. Cho, C. van Kessel, B.A. Linquist. 2012. Agronomic productivity and nitrogen requirements of alternative tillage and crop establishment systems for improved weed control in direct-seeded rice. Field Crops Research. 130:128-137.
  • Boddy, L.G.,K. J. Bradford and A J. Fischer. 2012. Population-based threshold models describe weed germination and emergence patterns across varying temperature, moisture and oxygen conditions. Journal of Applied Ecology, 49:1225-1236.
  • Alarcón-Reverte, R., A. García, J. Urzúa, and A. J. Fischer. 2013. Resistance to Glyphosate in Junglerice (Echinochloa colona) from California. Weed Science, 61:48-54.
  • Boddy, L.G., K.J. Bradford, A.J. Fischer. 2013. Stratification requirements for seed dormancy alleviation in a wetland weed. PLOS ONE, 8 (9): e71457. doi:10.1371/journal.pone.0071457
  • Ortiz, A., S. Blanco, G. Arana, L. López, S. Torres, Y. Quintana, P. Pérez, C. Zambrano, and A. Fischer. 2013. Estado actual de la resistencia de Ischaemum rugosum Salisb. al herbicida bispiribac-sodio en Venezuela [Current state of the resistance of Ischaemum rugosum Salisb. to the herbicide bispyribac-sodium in Venezuela]. Bioagro 25(2):79-89.