1. USDA-ARS; U.S. Salinity Lab, Soil Physics and Pesticide Research Unit; 450 West Big Springs Rd. Riverside CA 92507 USA
2. USDA-ARS; Insect Biology and Pest Management Research Unit; Tifton GA USA
3. USDA-ARS; Southeast Watershed Research Unit; P.O. Box 748 Tifton GA 31793-0748 USA
4. Dep. of Crop and Soil Sciences; Univ. of Georgia; P.O. Box 748 Tifton GA 31793-0748 USA
5. Dep. of Soil and Crop Sciences; Colorado State Univ.; Fort Collins CO 80524 USA
6. USDA-ARS; National Grain Insect Research Lab.; Brookings SD 57006-9803 USA