_____________________________________________________________ Biological control potential of the spotted stem borer Chilo partellus (Swinhoe) (Lepidoptera: Crambidae) with the entomopathogenic fungi Beauveria bassiana and Metarhizium anisopliae By Tadele Tefera Dissertation Presented for the Degree of Doctor of Philosophy in Agriculture at the University of Stellenbosch, South Africa Promoter: Dr. K. L. Pringle Department of Entomology & Nematology Faculty of Agricultural & Forestry Sciences University of Stellenbosch April 2004