African Journal of Biotechnology Vol. 6 (3), pp. 213-218, 5 February 2007   

ISSN 1684–5315 © 2007 Academic Journals        

Full Length Research Paper

Inhibition of Colletotrichum gloeosporioides (Penz) Sac. causal organism of rubber (Hevea brasiliensis Muell. Arg.) leaf spot using plant extracts

N. O. Ogbebor¹, A. T. Adekunle^2* and D. A. Enobakhare²

¹Plant Pathology/ MCB. Division, Rubber Research Institute of Nigeria, P. M. B. 1049 Benin City, Nigeria.

²Department of Crop Science, University of Benin, P.M.B. 1154, Benin City, Nigeria.

*Corresponding author email: adefunke2@yahoo.com.

Accepted 16 November, 2006

In vitro and in vivo antifungal evaluations were carried out on twenty-one plants selected from fourteen families on a folial pathogen of para rubber, Colletotrichum gloeosporioides (Penz). Sac. Extracts of Ocimum basilicum L. and Allium sativum L. exhibited total inhibitory effects on the mycelial growth of C. Gloeosporioides. An evaluation of concentration effects was carried out using four concentrations of five selected plants: A. sativum, Jatropha curcas, O. Basilicum, Vernonia amygdalina and Ageratum conyzoides. A. sativum and O. basilicum totally inhibited conidial germination 24 h after inoculation, and conidial germination in liquid amended media was recorded only in the A. conyzoides amended liquid media. An in vivo evaluation showed that treatment with 100% O. basilicum resulted in disease index (D.I) of 31.7% which was significantly lower than the control 65% D.I at 5% level of probability.

Key words: Colletotrichum gloeosporiodes, Hevea brasiliensis, plant extracts, inhibition.