1. Centre for Invasion Biology, Department of Botany & Zoology, Stellenbosch University, Matieland 7602, South Africa
2. Honey Bee Research Section, ARC-Plant Protection Research Institute, Stellenbosch, South Africa
3. Agronomy Department, University of Florida, Gainesville, Florida 32611, USA
4. South African National Biodiversity Institute, Kirstenbosch Research Centre, Claremont, South Africa
5. Biological Invasions Directorate, South African National Biodiversity Institue, P.O. Box 52099, Berea Road, Durban 4007, South Africa
6. Centre for Invasion Biology, Department of Conservation and Marine Sciences, Cape Peninsula University of Technology, P.O. Box 652, Cape Town 8000, South Africa
7. Department of Forest and Wood Science, Stellenbosch University, Stellenbosch, South Africa
8. Forestwood cc, P.O. Box 228, La Montagne 0184, South Africa
9. Invader Plant Specialists (Pty) LTD, Durbanville, South Africa
10. Department of Zoology and Entomology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, South Africa
11. Sappi Forests Research, Planning and Nurseries, Shaw Research Centre, PO Box 473, Howick, 3290, South Africa
12. Agricultural Research Council: Plant Protection Research, Private Bag X134, Queenswood 0121, Pretoria, South Africa
13. Department of Environmental Science and Centre for Invasion Biology, Rhodes University, P.O. Box 94, Grahamstown 6140, South Africa
14. Department of Genetics, Biochemistry and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, South Africa