1. Department of Entomology; Purdue University; West Lafayette IN 47907 USA
2. Syngenta Crop Protection; Greensboro NC 27409 USA
3. School of Chemistry; University of St. Andrews; St Andrews Fife KY 16 9AJ UK
4. Department of Botany and Zoology; University of Stellenbosch; Stellenbosch 7600 South Africa