Dr Jhoana Opena

Research Academic

School of Agriculture and Food Sustainability
Faculty of Science

Research Academic

School of Agriculture and Food Sustainability
Faculty of Science


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.”

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


  • Doctor of Philosophy, Charles Sturt University
  • Masters (Coursework), University of the Philippines
  • Bachelor, University of the Philippines Los Baños


View all Publications


  • Doctor Philosophy

View all Supervision


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 Article

Conference Publication

Other Outputs

PhD and MPhil Supervision

Current Supervision