1. Department of Entomology, Soils and Plant Sciences, 270 Poole Agricultural Center, Clemson University, Clemson, South Carolina 29634-0315, Department of Environmental Science & Engineering, Colorado School of Mines, Coolbaugh Hall, Golden, Colorado 80401-1887, and Department of Chemistry and Geochemistry, Colorado School of Mines, Golden, 1500 Illinois Street, Golden, Colorado 80401