Document Type: Review Article


1 Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603, Kuala Lumpur, Malaysia.

2 Centre for Research in Biotechnology for Agriculture (CEBAR), University of Malaya, 50603, Kuala Lumpur, Malaysia.


Rice industry in Malaysia faces serious challenges in managing weedy rice (Oryza sativa L.) since it was first observed in 1988. Unfortunately, there is no simple control method for weedy rice. Recommended practices in Malaysia adopted various integrated weedy rice management strategies mainly on land preparation and pre-harvest period controls. Multiple tillage, chemical applications via pre-emergence and pre-sowing herbicide, and manual weeding are the usual weedy rice control practices by majority of Malaysian farmers. The conspecific nature of weedy rice with cultivated rice increased the difficulty to control the weed with several weedy rice biotypes have already mimic the local varieties. Introduction of Clearfield® Rice Production System (CPS) in 2010 has shifted the current weedy rice management strategies to an herbicide-tolerant crop approach. Some concerns of the technology including potential resistant to weedy rice and environmental issues were discussed. Additional weedy rice management strategies as alternative approaches for Malaysia rice agro-ecosystems were proposed in this review to fill the gaps on current weedy rice controls including reducing cross contamination between farms, managing weedy rice seedbank, empowering alternative culture methods in rice farming, strengthening current Clearfield® system, and exploring ‘omics’ research for other potential herbicide tolerant rice. Improvement in communication is proposed to ensure any information on weedy rice management is effectively transferred between farmers and authorities.


Abraham C.T, Jose N. 2014. Weedy rice invasion in rice fields of India and management options. J. Crop Weed. 10: 365-374.

Alister C, Kogan M. 2005. Efficacy of imidazolinone herbicides applied to imidazolinone-resistant maize and their carryover effect on rotational crops. Crop prot. 24: 375-379.

Anuar N.S, Mazlan N, Ariff E.E, Juraimi A.S, Yusop M.R. 2014. A comparative study of vegetative and reproductive growth of local weedy and Clearfield® rice varieties in Malaysia. ISSAAS J. 20: 41–51.

Anwar M.P, Juraimi A.S, Samedani B, Puteh A, Man A. 2012. Critical period of weed control in aerobic rice. The Scientific World J. 1-10. doi:10.1100/2012/603043

Ashrafi A, Banayan M, Rashed M.M. 2004. Spatial dynamics of weed populations in a corn field using geostatistics. Iranian J. Field Crops Res. 1: 139-154.

Azmi M, Karim S.M.R. 2008. Weedy rice - Biology, Ecology and Management. Malaysian Agricultural Research and Development Institute (MARDI). Serdang, Malaysia.

Azmi M, Muhammad H. 2003. Distribution of weedy rice and its management in direct-seeded rice, Muda area, Malaysia. Malaysian Science and Technology Congress, Kuala Lumpur. September 2003. P: 23-25.

Azmi M, Abdullah M.Z, Mohamad H. 2001. Introduction and management of weedy rice in Malaysia (publication in Malay). Malaysian Agricultural Research and Development Institute (MARDI). Serdang, Malaysia.

Azmi M, Abdullah M.Z, Muhamad H. 2005a. Weedy rice (padi angin): a real threat to rice industry and farmers. Proceedings of 4th National Seed Symposium of the Malaysian Association of Seed Technologists (MAST). P:109-112.

Azmi M, Muhamad H, Johnson D.E. 2005b. Impact of Weedy Rice Infestation on Rice Yield and Influence of Crop Establishment Technique. Proceedings of 20th Asian-Pacific Weed Science Society Conference. Ho Chi Minh City, Vietnam.

Azmi M, Abdullah M.Z, Mislamah B, and Baki B.B. 2000. Management of weedy rice (Oryza sativa L.): the Malaysian experience. In: Wild and Weedy Rice in Rice Ecosystems in Asia – A Review (Baki B.B., Chin D.V., Mortimer M. eds.). IRRI, Manila, Philippines, pp.25-34.

Azmi M, Abdullah M.Z. 1998. A manual for the identification and control of padi angin (weedy rice) in Malaysia. Malaysian Agricultural Research and Development Institute (MARDI). Serdang, Malaysia.

Azmi M, Azlan S, Yim K.M, George T.V, Chew S.E. 2012. Control of weedy rice in direct seeded rice using the Clearfield® production system in Malaysia. Paki J. Weed Sci. Res. 18: 49-53.

Azmi M, Johnson D.E. 2006. Crop establishment options for lowland irrigated rice in relation to weed infestation and grain yield. J. Trop. Agric. Food Sci. 37: 111-117.

Azmi M, Sivapragasam A, Abdullah M.Z, Muhamad H. 2003. Weedy rice and its management through integration of cultural, physical and chemical interventions in direct-seeded rice. International Rice Conference, Alor Setar, Malaysia. P:112-119.

Baek J.S, Chung N.J. 2012. Seed wintering and deterioration characteristics between weedy and cultivated rice. Rice. 5: 21.

Bahm M.A, Barnes T.G, Jensen K.C. 2011. Herbicide and fire effects on smooth brome (Bromus inermis) and Kentucky bluegrass (Poa pratensis) in invaded prairie remnants. Invasive Plant Sci. Manag. 4: 189-197.

Bajrai F.S.M, Ismail B.S, Mardiana-Jansar K, Omar R. 2017. Persistence of Imazapic and Imazapyr in paddy soil and water. Intern. J. Advances in Agric. & Environ. Engine. 4: 12-15.

Baki B.B. 2004. Invasive weed species in Malaysia: Species, impacts and management. Malaysian J. of Sci. 23: 1-23.

Baki B.B. 2006. Weed Ecology and Management in Rice Ecosystems. Universiti Malaya Press, Kuala Lumpur.

Baki B.B. 2007. Utilization of weeds and their relatives in Malaysia. In: Kim et al.  (eds.). Utilization of weeds and their relatives. Kyungpook National University Press, Taegu, Korea.

Baki B.B. 2010. Shaping the future of weed science to serve humanity in the Asia-Pacific. Paki J. Weed Sci. Res. 16: 123-138.

Baki B.B, Shakirin M.M. 2010. Spatio-temporal distribution pattern of new biotypes of weedy rice (Oryza sativa L.) in Selangor North-West Project, Malaysia. Korean J. Weed Sci. 30: 68-83.

Baki B.B, Bakar M.A, Man A.B. 2000. Weedy rice (Oryza sativa L.) in Peninsular Malaysia. In: Baki et al.  (eds.). Wild and Weedy Rice in Rice Ecosystems in Asia – A Review. IRRI, Manila, Philippines. pp.25-34.

Benvenuti S, Macchia M, Miele S. 2001. Quantitative analysis of emergence of seedlings from buried weed seeds with increasing soil depth. Weed Sci. 49: 528–535.

Bhullar M.S, Chauhan B.S. 2015. Seed bank dynamics and emergence pattern of weeds as affected by tillage systems in dry direct-seeded rice. Crop Prot. 67: 168-177.

Bzour M.I, Zuki F.M, Mispan M.S. 2018. Introduction of imidazolinone herbicide and Clearfield® rice between weedy rice-control efficiency and environmental concern. Environ. Rev. 26: 181-198.

Chang T.T. 1991. Findings from a 28-yr seed viability experiment. International Rice Research Newsletter. 16:5–6.

Chauhan B.S. 2013. Strategies to manage weedy rice in Asia. Crop Prot. 48: 51-56.

Delouche J.C, Burgos N.R, Gealy D.R, de San Martin G.Z, Labrada R, Larinde M, Rosell C. 2007. Weedy rice - origin, biology, ecology and control. FAO Plant Production and Protection Paper. FAO, Rome.

Department of Agriculture. 2016. Paddy statistics of Malaysia 2015. Department of Agriculture Peninsular Malaysia.

Diarra A, Smith R, Talbert R.E. 1985. Red rice (Oryza sativa) control in drill-seeded rice (O. sativa). Weed Sci. 33: 703-709.

Dilipkumar M, Chuah T.S, Goh S.S, Sahid I. 2017. Weed management issues, challenges, and opportunities in Malaysia. Crop prot. 18.

Engku A.K, Norida M, Juraimi A.S, Rafii M.Y, Abdullah S.N.A, Alam M.A. 2016. Gene flow from Clearfield® rice to weedy rice under field conditions. Plant Soil Environ. 62: 16-22.

Ferrero A. 2003. Weedy rice, biological features and control. In: Weed Management for Developing Countries (Labrada, R. ed.). FAO Plant Production and Protection.

Fogliatto S, Vidotto F, Ferrero A. 2010. Effects of winter flooding on weedy rice (Oryza sativa L.). Crop Prot. 29: 1232-1240.

Gu X.Y, Chen Z.X, Foley M.E. 2003. Inheritance of seed dormancy in weedy rice. Crop Sci. 43: 835-843.

Gu X.Y, Kianian S.F, Foley M.E. 2006. Dormancy genes from weedy rice respond divergently to seed development environments. Genetics. 172: 1199-1211.

Gu X.Y, Kianian S.F, Hareland G.A, Hoffer B.L, Foley M.E. 2005. Genetic analysis of adaptive syndromes interrelated with seed dormancy in weedy rice (Oryza sativa). Theol. Appl. Genet. 110: 1108-1118.

Jaafar N.F, Juraimi A.S, Hamdani M.S.A, Kamaluddin M, Man A. 2014. Distribution of weedy rice escape variants in Clearfield Rice Production System. Res. on Crops. 15: 754-762.

Juraimi A.S, Uddin M.K, Anwar M.P, Mohamed M.T.M, Ismail M.R, Man A. 2013. Sustainable weed management in direct seeded rice culture: A review. Aus. J. Crop Sci.7: 989-1002.

Kadir A, Kamariah O. 2003. Bridging the technology gap through effective expansion programs. Proceeding of an International Rice Conference. Alor Setar, Malaysia. 13-16 October. p.208-216.

Konstantinovic B, Meseldzija M, Korac M. 2011. Study of weed seedbank in soybean crop. African J. Agric. Res. 6: 2316-2320.

Mahyoub I.B, Fathiah, M.Z, Muhamad S.M, Mohamed K.A, Jodeh S.W, Monzir S.A. 2017. A simple method for determination and characterization of imidazolinone herbicide (imazapyr/imazapic) residues in Clearfield® rice soil. Appl. Ecol. Environ. Res. 15: 891-903.

McDonald M.B. 1999. Seed deterioration: physiology, repair and assessment. Seed Sci. Technol. 27: 177–237.

Mispan M.S. 2008. Descriptive analyses on the new biotype of weedy rices in Selangor North-West project, Malaysia. MSc. Thesis. University of Malaya. Kuala Lumpur, Malaysia.

Mispan M.S. 2014. Ecological Genetics/Genomics of Weedy Rice. Ph.D. Thesis. South Dakota State University. USA.

Mispan M.S, Jalaluddin A, Majrashi AA, Baki B.B. 2015. Weed Science in Malaysia: An Analysis. In. Weed Science in the Asian Pacific Region (Rao et al.  eds). Asian-Pacific Weed Science Society.

Mispan M.S, Zhang L, Feng J, Gu X.Y. 2013. Quantitative trait locus and haplotype analyses of wild and crop-mimic traits in U.S. weedy rice. G3: Genes Genomes Genetics. 3: 1049-1059.

Miura K, Lin S.Y, Yano M, Nagamine T. 2002. Mapping quantitative trait loci controlling seed longevity in rice (Oryza sativa L.). Theol. Appl. Genet. 104: 981–986.

Mohamed Z, Terani R, Shamsudin M.N, Latif I.A. 2016. Paddy farmers’ sustainability practices in granary areas in Malaysia. Resources. 5: 17.

Moldenhauer K.A.K, Gibbons J.H. 2003. Rice Morphology and Development. In: Rice. Origin, History, Technology, and Production (eds. Smith CW, Dilday RH). John Wiley and Sons, Inc., Hoboken, New Jersey. pp 103-127.

Noldin J.A. 2000 Red rice status and management in Americas. In: Wild and weedy rice in rice ecosystems in Asia – a review (eds. Baki B.B, Chin D.V, Mortimer M.). Los Baños, Philippines: International Rice Research Institute, p. 21-24.

Noldin J.A, Chandler J.M, McCauley G.N. 2006. Seed longevity of red rice ecotypes buried in soil. Planta Daninha. 24: 611-620.

Nordin S.M, Noor S.M, Saad M.S.M. 2014. Innovation diffusion of new technologies in the Malaysian paddy fertilizer industry. Procedia Soc. Behav. Sci. 109: 768-778.

Nordin S.M, Redza A, Saad M.S.M. 2017. Innovation diffusion: farmers’ perception towards new green fertilizer in granary paddy fields in Malaysia. Glob. Bus. Manag. Res. (GBMR). 49: 690-702.

Nordin S.M, Rizal A.R.A, Yahya J. 2015. Communication impact towards innovation on paddy plantation (article in Malay). Journal Pengurusan. 44: 35-45.

Pandey S, Mortimer A.M, Piggin C. 2000. An economic framework for optimal management of weedy rice on Asian rice farms. In: Proceeding on Wild and Weedy rice in Rice Ecosystems in Asia - A review. Eds. Baki, BB., Chin, DV., and Mortimer, M. IRRI, Los Banos, Phillippines. P.107-118.

Roberts E.H. 1961. The viability of rice seed in relation temperature, moisture content, and gaseous environment. Ann. Bot. 25: 381–390.

Roham R, Akbari N, Noghabi M.A, Nazarian F, Yaghubi M. 2012. Investigation of the best time to sample for the study of seed bank and weed density relationships in sugar beet farm land by using regressions and geostatic relations. Int. J. Agric. Crop Sci. 4: 512-517.

Ruzmi R, Ahmad-Hamdani M.S, Bakar B.B. 2017. Prevalence of herbicide-resistant weed species in Malaysian rice fields: A review. Weed Biol. Manag. 17: 3-16.

Saad M.M, Amzah B, Masaruddin M.F, Jack A, Misman S.N, Ramachandran K, Vun C.T, Man A. 2017. Pest, disease and weed in Malaysia (publication in Malay). Malaysian Agriculture Research and Development Institute (MARDI). Serdang, Malaysia.

Saiman M.Z. 2014. Terpenoids and terpenoidindole alkaloids in Catharanthusroseus cell suspension cultures. Institute of Biology, Faculty of Science, Leiden University. Holland.

Sasaki K, Fukuta Y, Sato T. 2005. Mapping of quantitative trait loci controlling seed longevity of rice (Oryza sativa L.) after various periods of seed storage. Plant Breed. 124: 361-366.

Shigemune A, Miura K, Sasahara H, Goto A, Yoshida T. 2008. Role of maternal tissues in qLG-9 control of seed longevity in rice (Oryza sativa L.). Breed. Sci. 58: 1-5.

Song B.K, Chuah T.S, Tam S.M, Olsen K.M. 2014. Malaysian weedy rice shows its true stripes: wild Oryza and elite rice cultivars shape agricultural weed evolution in Southeast Asia. Mol. Ecol. 23: 5003-5017.

Sudianto E, Beng-Kah S, Ting-Xiang N, Saldain N.E, Scott R.C, Burgos N.R. 2013. Clearfield® rice: Its development, success, and key challenges on a global perspective. Crop Prot. 49: 40-51.

Sudianto E, Neik T.X, Tam S.M, Chuah T.S, Idris A.A, Olsen K.M, Song B. 2016. Morphology of Malaysian weedy rice (Oryza sativa): diversity, origin and implications for weed management. Weed Sci. 64: 501-512

Suh H.S. 2008. Weedy rice. Yeungnam University. Korea.

Vaughan D.A. 1994. The Wild Relatives of Rice. A Genetic Resources Handbook. Los Baños, Philippines: International Rice Research Institute. P.137.

Wahab A, Suhaimi O. 1991. Weedy rice characteristics, adverse effects and methods of its eradication (article in Malay). Teknologi Padi. 7: 21-31.

Ye H, Feng J, Zhang L, Mispan M.S, Cao Z, Beighley D.H, Yang J, Gu X.Y. 2015. Map-Based Cloning of Seed Dormancy1-2 Identified a Gibberellin Synthesis Regulating the Development of Endosperm-Imposed Dormancy in Rice. Plant Physiol. 169: 2152-2165.