Dr Jhoana Opena

Research Academic

School of Agriculture and Food Sustainability
Faculty of Science


Dr Jhoana Opena joined the School of Agriculture and Food Science as a Postdoctoral Research Fellow in 2021. Dr Opena has 15 years of experience on research in IPM in vegetables and weed management in rice-based cropping systems in Australia, Philippines and Cambodia. Previously she worked as an Associate Scientist in the Weed Science group of the International Rice Reseacrh Institute and was appointed as an Adjunct Associate Professor at the University of the Philippines in Los Banos. She finished 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 mechanised 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, C.Sturt
  • Master of Science (in Agronomy), UP


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