1. Federal Research Centre for Cultivated Plants, Institute for Biological Control, Julius Kühn Institute, Darmstadt, Germany
2. Centre for Biological Control, Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa
3. Citrus Research International (CRI), Walmer, Port Elizabeth, South Africa
4. Department of Biochemistry and Microbiology, Rhodes University, Grahamstown, South Africa