African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12412

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. Adekunle2* 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.
Email: [email protected]

  •  Published: 05 February 2006

Abstract

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 sativumL. 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 amygdalinaand Ageratum conyzoidesA. sativum and Obasilicum 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% Obasilicum 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.