_____________________________________________________________________________________________________ *Corresponding author: E-mail: ask4ariyo@yahoo.com; Asian Journal of Research in Agriculture and Forestry 1(2): 1-14, 2018; Article no.AJRAF.40141 Determinants of Medicinal Plants Usage for Traditional Herbal Medicine among Villagers in Ibadan, Oyo State, Nigeria O. C. Ariyo 1* and M. O. Ariyo 2 1 Department of Vocational and Technical Studies, Forestry Research Institute of Nigeria, Federal College of Forestry Mechanization, Afaka, Kaduna, Kaduna State, Nigeria. 2 Department of Horticulture and Landscape Technology, Forestry Research Institute of Nigeria, Federal College of Forestry Mechanization, Afaka, Kaduna, Kaduna State, Nigeria. Authors’ contributions This work was carried out in collaboration between both authors. Author OCA designed the study, performed the statistical analysis, wrote the protocol, and wrote the first draft of the manuscript. Authors OCA and MOA managed the analyses of the study. Author MOA managed the literature searches. Both authors read and approved the final manuscript. Article Information DOI: 10.9734/AJRAF/2018/40141 Editor(s): (1) Md. Abiar Rahman, Department of Agroforestry and Environment, Bangabandhu Sheikh Mujibur Rahman- Agricultural University (BSMRAU), Bangladesh. Reviewers: (1) Esraa Ashraf Ahmed ElHawary, Ain Shams University, Egypt. (2) Muhammad Ali, Kano University of Science and Technology, Nigeria. (3) Izharul Hasan, India. Complete Peer review History: http://www.sciencedomain.org/review-history/23859 Received 13 th January 2018 Accepted 20 th March 2018 Published 28 th March 2018 ABSTRACT The study was designed to access the determinants of medicinal plants for traditional herbal medicine among villagers living at the perimeter fence of International Institute of Tropical Agriculture (IITA), Ibadan, Oyo State, Nigeria. The multistage sampling procedure was adopted for the study. A total number of four hundred and eight respondents comprising of farmers, hunters, herbalists and herb sellers were randomly selected and interviewed using copies of a well- structured questionnaire. Data were analysed using descriptive statistics, Probit and Tobit regression analysis. The study showed that the average ages of farmers and hunters were 55 and 57 years while the average age of herb sellers was 43 and herbalist 63 years. Majority of the respondents pooled together were males, married with an average age of 55 years and household Original Research Article