Overview
Background
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.”
Availability
- Dr Jhoana Opena is:
- Available for supervision
Qualifications
- Bachelor, University of the Philippines Los Baños
- Masters (Coursework), University of the Philippines
- Doctor of Philosophy, Charles Sturt University
Research interests
-
Weed management in rice and rice-based cropping systems
-
Weed ecology
-
Integrated weed management in direct seeded rice systems
-
Weed population dynamics
-
Allelopathy and its application for weed management
Works
Search Professor Jhoana Opena’s works on UQ eSpace
2022
Conference Publication
Current weed management practices and obstacles in rainfed lowland direct seeded rice systems in Southern Cambodia
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.
2022
Conference Publication
Rice weed seed contamination of farmers retained and certified seeds in Lao PDR
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.
2022
Conference Publication
Screening of rice genotypes for their weed competitiveness in Lao PDR
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.
2021
Journal Article
Potential of winter pasture legume in rice rotations to mitigate barnyard grass (Echinocloa crus-galli) impacts in temperate Australia
Opena, Jhoana, Pratley, James, Lemerle, Deirdre, Wu, Hanwen and McCormick, Jeffrey (2021). Potential of winter pasture legume in rice rotations to mitigate barnyard grass (Echinocloa crus-galli) impacts in temperate Australia. Agricultural Science, 79-91.
2021
Other Outputs
Impacts of pasture legume phase on the seed bank of barnyard grass in drill sown rice
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.
2021
Other Outputs
Impacts of pasture legume phase on the seed bank, establishment and growth of barnyard grass (Echinochloa crus-galli) in drill sown rice
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.
2019
Conference Publication
Pasture legumes offer promise to control barnyard grass in delayed permanent water systems in rice
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.
2018
Conference Publication
Allelopathic potential of pasture legume species and selected winter crops on barnyard grass and rice
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..
2017
Book Chapter
Rice weed management in Southeast Asia
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.
2015
Conference Publication
Persistence of oxadiazon residues in soil and grains in an upland rice (Oryza sativa) field
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. ACS Fall 2015 Meeting, Boston, MA United States, 16 - 20 August 2015. Washington, DC United States: American Chemical Society.
2015
Journal Article
Seed Germination Ecology of Doveweed (Murdannia nudiflora) and Its Implication for Management in Dry-Seeded Rice
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
2015
Journal Article
Response of 10 elite “green super rice” genotypes to weed infestation in aerobic rice systems
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
2014
Journal Article
Weed population dynamics, herbicide efficacies, and crop performance in a sprinkler-irrigated maize-rice cropping system
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
2014
Journal Article
Seed germination ecology of echinochloa glabrescens and its implication for management in rice (Oryza sativa L.)
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
2013
Journal Article
Weed management and grain yield of rice sown at low seeding rates in mechanized dry-seeded systems
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
2013
Journal Article
Effect of plant geometry on growth and yield of corn in the rice-corn cropping system
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
2013
Journal Article
Effect of plant spacing on growth and grain yield of soybean
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
2013
Journal Article
Implications of plant geometry and weed control options in designing a low-seeding seed-drill for dry-seeded rice systems
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
2013
Journal Article
Management of volunteer corn seedlings in dry-seeded rice
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
2012
Journal Article
Effect of tillage systems and herbicides on weed emergence, weed growth, and grain yield in dry-seeded rice systems
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
Supervision
Availability
- Dr Jhoana Opena is:
- Available for supervision
Before you email them, read our advice on how to contact a supervisor.
Available projects
Supervision history
Current supervision
-
Doctor Philosophy
Impact of pesticide residues on food safety and soil quality in direct seeded rice systems
Associate Advisor
Other advisors: Dr Dara Daygon, Associate Professor Jaquie Mitchell
-
Doctor Philosophy
GIS and remote sensing for improved weed management in direct seeded rice
Associate Advisor
Other advisors: Associate Professor Jaquie Mitchell, Professor Ammar Abdul Aziz, Dr Md. Ali Akber
Media
Enquiries
For media enquiries about Dr Jhoana Opena's areas of expertise, story ideas and help finding experts, contact our Media team: