Biocontrol Fungus

Mal.J. Microbiol. Vol 4(1) 2008, pp. 30-39

Fungal Control of Pathogenic Fungi Isolated From Some Wild Plants in Taif Governorate, Saudi Arabia
Abou-Zeid A.M.*, Altalhi, A. D. and Abd El-Fattah, R.I Biology department, Faculity of Science, Taif University, Saudi Arabia. P.B. (888) E-mail: [e-mail]

ABSTRACT Twenty two plants were collected from Taif Governorate and identified as: Aerva lanata, Arnebia hispidissima, Artemisia judaica, Artemisia monosperma, Asphodelus aestives, Avena barbata, Capparis dcidua, Eucalyptus globulus, Euphorbia glomerifera, Foeniculum vulgare, Forsskaolea tenacissima, Juniperus procera, Launaea mucronata, Launaea sonchoides, Medicago sativa, Opuntia ficus, Phagnalon sinaicum, Prunus persica, Pulicaria crispa, Punica granatum, Rumex dentatus and Trichodesma calathiforme. Pathogenic fungi were isolated from some of these plants and identified as Alternaria alternata, Cephalosporium madurae, Cladosporium herbarum, Fusarium oxysporum, Humicola grisea, Penicillium chrysogenum and Ulocladium botrytis. Four antagonistic isolates were tested, 2 from Gliocladium fungus and 2 from Trichoderma fungus. We found that all the four antagonistic isolates (G. deliquescens, G. virens, T. viride and T. hamatum) significantly inhibited the radial growth of the pathogenic fungi tested, with different ratios. The results indicated that the antibiotics produced by the antagonists were more effective than the fungus itself and differ with different fungi. Coating plant stems with antagonists or with antagonist extracts reduce the severity of the disease but not prevent it in all tested pathogens.
Keywords: pathogen, antagonist, antibiotic

INTRODUCTION Plant diseases play a direct role in the destruction of natural resources in agriculture. In particular, pathogens cause important losses, fungi being the most aggressive. Chemical compounds have been used to control plant diseases (chemical control), but abuse in their employment has

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