Dr Jhoana Opena
Research Academic
School of Agriculture and Food Sustainability
Researcher biography
Dr. Jhoana Opena, a seasoned researcher, joined the School of Agriculture and Food Sustainability as a Postdoctoral Research Fellow in 2021. Dr. Opena has over 18 years of experience in research related to Integrated Pest Management (IPM) in vegetables and weed management within rice-based cropping systems across Australia, the Philippines, Cambodia, and Lao PDR. Previously, she worked as an Associate Scientist in the Weed Science group at the International Rice Research Institute and was appointed as an Adjunct Associate Professor at the University of the Philippines in Los Baños. She successfully completed her Doctor of Philosophy in Agriculture at Charles Sturt University in Wagga Wagga, Australia, in 2021. Currently, she is working on an ACIAR project entitled "Weed Management Techniques for Mechanized and Broadcast Lowland Crop Production Systems in Cambodia and Lao PDR."
Publications
Book Chapter
Kumar, Virender, Opena, Jhoana, Valencia, Katherine, Thi, Ho Le, Nguyen, Hong Son, Donayre, Dindo King, Janiya, Joel and Johnson, David E. (2017). Rice weed management in Southeast Asia. Weed Management in Rice in the Asian Pacific Region. (pp. 282-307) Hyderabad, India: Asian-Pacific Weed Science Society.
Journal Articles
Ahmed, Sharif, Opena, Jhoana L and Chauhan, Bhagirath S (2015). Seed Germination Ecology of Doveweed (Murdannia nudiflora) and Its Implication for Management in Dry-Seeded Rice. Weed Science, 63 (2), 491-501. doi: 10.1614/WS-D-14-00115.1
Chauhan, Bhagirath Singh, Opena, Jhoana and Ali, Jauhar (2015). Response of 10 elite “green super rice” genotypes to weed infestation in aerobic rice systems. Plant Production Science, 18 (2), 228-233. doi: 10.1626/pps.18.228
Opena, Jhoana L., Quilty, James R., Correa, Teodoro Q. and Chauhan, Bhagirath S. (2014). Weed population dynamics, herbicide efficacies, and crop performance in a sprinkler-irrigated maize-rice cropping system. Field Crops Research, 167, 119-130. doi: 10.1016/j.fcr.2014.07.014
Opena, Jhoana L, Chauhan, Bhagirath S. and Baltazar, Aurora M. (2014). Seed germination ecology of echinochloa glabrescens and its implication for management in rice (Oryza sativa L.). PLoS ONE, 9 (3) e92261, e92261.1-e92261.9. doi: 10.1371/journal.pone.0092261
Chauhan, B. S. and Opena, J. (2013). Weed management and grain yield of rice sown at low seeding rates in mechanized dry-seeded systems. Field Crops Research, 141, 9-15. doi: 10.1016/j.fcr.2012.11.002
Chauhan, Bhagirath S. and Opeña, Jhoana L. (2013). Effect of plant geometry on growth and yield of corn in the rice-corn cropping system. American Journal of Plant Sciences, 04 (10), 1928-1931. doi: 10.4236/ajps.2013.410237
Chauhan, B. S. and Opena, J. (2013). Implications of plant geometry and weed control options in designing a low-seeding seed-drill for dry-seeded rice systems. Field Crops Research, 144, 225-231. doi: 10.1016/j.fcr.2012.12.014
Chauhan, Bhagirath S. and Opeña, Jhoana L. (2013). Effect of plant spacing on growth and grain yield of soybean. American Journal of Plant Sciences, 04 (10), 2011-2014. doi: 10.4236/ajps.2013.410251
Chauhan, Bhagirath S. and Opeña, Jhoana L. (2013). Management of volunteer corn seedlings in dry-seeded rice. American Journal of Plant Sciences, 04 (12), 2381-2385. doi: 10.4236/ajps.2013.412294
Chauhan, B. S. and Opena, J. (2012). Effect of tillage systems and herbicides on weed emergence, weed growth, and grain yield in dry-seeded rice systems. Field Crops Research, 137, 56-69. doi: 10.1016/j.fcr.2012.08.016
Chauhan, Bhagirath S. and Opea, Jhoana (2012). Growth of purple nutsedge (cyperus rotundus) in response to interference with direct-seeded rice. Weed Technology, 26 (3), 506-509. doi: 10.1614/WT-D-12-00007.1
Conference Papers
Opena, Jhoana, Homsengchanh, Laeh, Thanak, Tho, Orn, Chourn, Xangsayasane, Phetmanyseng and Mitchell, Jaquie (2024). Screening weed suppressive rice germplasm in Cambodia and Lao PDR. 23rd Australasian Weeds Conference, Brisbane, QLD Australia, 25-29 August 2024.
Opena, Jhoana, Eam, Sreynich, Vinarao, Ricky, Gong, Wenliu and Mitchell, Jaquie (2024). Phenotypic traits associated with weed competitiveness for aerobic rice production system in Australia. International Temperate Rice Conference 2024, New Orleans, LA United States, 5-8 June 2024.
Sukmawijaya, Adhera, Opena, Jhoana, Akber, Ali, Mitchell, Jaquie and Abdul Aziz, Ammar (2024). Capabilities of hyperspectral spectroradiometer for differentiating rice and rice mimicry weeds on leaf-level measurement. 23rd Australasian Weeds Conference, Brisbane, QLD Australia, 25-29 August 2024.
Bouahom, Bounthanom, Palaniappan, Gomathy, Opena, Jhoana and Mitchell, Jaquie (2023). Herbicides in lowland rice farming: What's driving the farmer's choice in Lao PDR?. 28th Asian Pacific Weed Science Society Conference (APWSS 2023), Phuket, Thailand, 26-29 November 2023. Weed Science Solutions for Global Food Security:
Opena, Jhoana and Mitchell, Jaquie (2023). Designing best weed management practices for mechanized rainfed and irrigated direct seeded rice systems in Cambodia and Lao PDR. International Rice Congress 2023, Manila, Philippines, 16 - 19 October 2023. Zenodo. doi: 10.5281/zenodo.10398266
Lim, Sophornthida, Chea, Sareth, Palaniappan, Gomathy, Opena, Jhoana and Mitchell, Jaquie (2023). Unlocking women's potential for effective weed management in rainfed lowlands: A Cambodian perspective. International Rice Congress 2023, Manila, Philippines, 16-19 October 2023. Zenodo. doi: 10.5281/zenodo.10398235
Palaniappan, Gomathy, Chea, Sareth, Lim, Sophornthida, Bouahom, Bounthanom, Nguyen, Minh Anh, Nguyen, Binh Thanh, Nguyen, Tin Hong, Opena, Jhoana and Mitchell, Jaquie (2023). Promoting gender equality amongst rice farmers: Insights from ACIAR funded projects in Laos, Cambodia, and Vietnam. International Rice Congress 2023, Manila, Philippines, 16-19 October 2023. Zenodo. doi: 10.5281/zenodo.10398686
Bounthanom, Bouahom, Gomathy, Palaniappan, Jhoana, Opena and Jaquie, Mitchell (2023). Empowering rice farmers in Laos through gender-inclusive integrated weed management training. International Rice Congress 2023, Manila, Philippines, 16-19 October 2023. doi: 10.5281/zenodo.10398315
Vongxayya, Khamtay, Opena, Jhoana, Xangsayasane, Phetmanyseng, Lemerle, Deirdre and Mitchell, Jaquie (2023). Weed seed contamination of rice from a drill-seeded intercropping demonstration compared with farmers’ broadcast rice in Lao PDR. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Manivong, Phatsalakone, Xangsayasane, Phetmanyseng, Opena, Jhoana, Lemerle, Deirdre and Mitchell, Jaquie (2023). Magnitude of weed problems in direct-seeded rice systems in Lao PDR. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Lim, Vanndy, Touch, Veasna, Vial, Leigh, Sodany, Srom, Phoeun, Chetra, Sun, Chanketya, Opena, Jhoana and Mitchell, Jaquie (2023). Integrated weed management in direct seeded rice using stale seedbed techniques and pre-emergence herbicide under rainfed lowland rice in Cambodia. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Pel, Dora, Lim, Sophornthida, Chea, Sareth, Palaniappan, Gomathy, Opena, Jhoana and Mitchell, Jaquie (2023). Current and integrated weed management prospects in Cambodia’s direct seeded rice production. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Sokvisal, Kong, Sathya, Khay, Opena, Jhoana, Lemerle, Deirdre and Mitchell, Jaquie (2023). Weed seedbank in direct-seeded rice systems in Cambodia. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Lovanxay, Douangsavanh, Xangsayasane, Phetmanyseng, Opena, Jhoana, Lemerle, Deirdre and Mitchell, Jaquie (2023). Baseline weed seedbank survey in direct-seeded rice systems in Lao PDR. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Opena, Jhoana, Pratley, Jim, McCormick, Jeffrey, Wu, Hanwen and Lemerle, Deirdre (2023). Allelopathic pasture legumes to manage barnyard grass in drill sown rice in temperate Australia. 28th Asian Pacific Weed Science Society Conference, Phuket, Thailand, 26-29 November 2023.
Homsengchanh, Laeh, Xangsayasane, Phetmanyseng, Opena, Jhoana and Mitchell, Jaquie (2023). Genetic variability for rice tolerance to anaerobic germination in the Laos gene bank. International Rice Congress 2023, Manila, Philippines, 16-19 October 2023.
Lim, Sophornthida, Chea, Sareth, Palaniappan, Gomathy, Opena, Jhoana and Mitchell, Jaquie (2022). Current weed management practices and obstacles in rainfed lowland direct seeded rice systems in Southern Cambodia. 8th International Weed Science Congress, Bangkok, Thailand, 4-9 December 2022.
Opena, Jhoana and Mitchell, Jaquie (2022). Weed management in lowland rice cropping systems in Cambodia and Lao PDR. TropAg International Agriculture Conference, Brisbane, QLD Australia, 31 October - 2 November 2022.
Vongxayya, Khamtay, Opena, Jhoana, Xangsayasane, Phetmanyseng, Lemerle, Deirdre and Mitchell, Jaquie (2022). Rice weed seed contamination of farmers retained and certified seeds in Lao PDR. 8th International Weed Science Congress, Bangkok, Thailand, 4-9 December 2022.
Opena, Jhoana, Pratley, Jim, McCormick, Jeffrey, Wu, Hanwen and Lemerle, Deirdre (2022). Light and temperature affect the germination of barnyard grass in drill sown rice in Australia. 8th International Weed Science Congress, Bangkok, Thailand, 4-9 December 2022.
Homsengchanh, Laeh, Xangsayasane, Phetmanyseng, Opena, Jhoana, Lemerle, Deirdre and Mitchell, Jaquie (2022). Screening of rice genotypes for their weed competitiveness in Lao PDR. 8th International Weed Science Congress, Bangkok, Thailand, 4-9 December 2022.
Bouahom, Bounthanom, Palaniappan, Gomathy, Abdul Aziz, Ammar, Opena, Jhoana, Xangsayasane, Phetmanyseng and Mitchell, Jaquie (2022). Weed management and gender roles in lowland rice production systems in Lao PDR. 8th International Weed Science Congress, Bangkok, Thailand, 4-9 December 2022.
Opena, Jhoana, Pratley, James, McCormick, Jeffrey, Wu, Hanwen and Lemerle, Deirdre (2019). Pasture legumes offer promise to control barnyard grass in delayed permanent water systems in rice. 2019 Agronomy Australia Conference, Wagga Wagga, NSW, Australia, 25 – 29 August 2019.
Opena, Jhoana, Wu, Hanwen, Moroni, Sergio, Lemerle, Deirdre and Pratley, James (2018). Allelopathic potential of pasture legume species and selected winter crops on barnyard grass and rice. 21st Australasian Weeds Conference, Manly, Australia, 2-12 September 2018. The Weed Society of New South Wales Inc..
Bunquin, Michelle Anne, Onoya, Jerone, Chauhan, Bhagirath, Opena, Jhoana and Beebout, Sarah (2015). Persistence of oxadiazon residues in soil and grains in an upland rice (Oryza sativa) field. Unknown, Unknown, Unknown. Washington, DC United States: American Chemical Society.
Working Paper
Research Report
Opena, Jhoana, Pratley, James, Lemerle, Deirdre, Wu, Hanwen and McCormick, Jeffrey (2021). Impacts of pasture legume phase on the seed bank of barnyard grass in drill sown rice. Wagga Wagga, NSW, Australia: AgriFutures Australia.
Thesis
Opena, Jhoana (2021). Impacts of pasture legume phase on the seed bank, establishment and growth of barnyard grass (Echinochloa crus-galli) in drill sown rice. PhD Thesis, School of Agricutural, Environmental and Veterinary Sciences, Charles Sturt University.