1. Habitat Management Programme; International Centre of Insect Physiology and Ecology; PO Box 30 Mbita Point Kenya
2. Global Change and Sustainability Research Institute; School of Animal Plant and Environmental Sciences; University of the Witwatersrand; Private Bag 3; Wits Johannesburg 2050 South Africa
3. Biological Chemistry and Crop Protection Department; Rothamsted Research; Harpenden Herts AL5 2JQ UK