African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12227

Full Length Research Paper

Management of foliar and soilborne pathogens of cowpea (Vigna unguiculata L. Walp) with two garlic varieties (Allium Sativum A. Linn)

Peluola Cecilia*
  • Peluola Cecilia*
  • Department of Botany and Microbiology, University of Ibadan, Ibadan, Oyo State, Nigeria.
  • Google Scholar
Fadina Olubunmi
  • Fadina Olubunmi
  • Crop Protection and Environmental Biology, University of Ibadan, Ibadan, Oyo State, Nigeria.
  • Google Scholar


  •  Received: 20 February 2014
  •  Accepted: 12 March 2014
  •  Published: 23 April 2014

Abstract

White and pink garlic extracts were tested for their antifungal potentials on mycelial radial growth, spores and sclerotial production of Macrophomina phaseolina (Tassi) Goid, Colletotrichum destructivum O gara and Colletotrichum capsici (Syd) Butler and Bisby pathogens of cowpea in vitro. Water or ethanol extracts of common pink and common white garlic varieties were tested at a concentration of 250 ppm while sterile distilled water served as control. In vivo study was based on white garlic extract alone at 0, 50 and 100% concentrations on M. phaseolina and C. capsici. Data were subjected to ANOVA and means was separated at P=0.05. Water extracted white garlic gave over 90% inhibitions of mycelial growth of M. phaseolina and gave higher inhibitions than water or ethanolic pink garlic extracts on all the three pathogens. It is not significantly lower P=0.05 than conventional fungicide benomyl at 0.5 gai/kg. However, in vivo result was phytotoxic to cowpea seeds at 100% concentration of white garlic extract. On cowpea variety TVx 3236, C. capsici inoculated seed germination and pathogen control was 100%, also, M. phaseolina inoculated seeds germination was 100% but there was no pathogen control at 50% garlic extract. In contrast, cowpea variety IT84S-2246-4 seed germination was 77% when treated with M. phaseolina and 100% with C. capsici but reduced pathogen control at 50% garlic extract.

 

Key words: Pink and white garlic, fungal pathogens, conventional fungicide, cowpea varieties, germination, phytotoxicity, control.