1. Dep. of Soil and Crop Sciences, C127 Plant Sciences BuildingColorado State Univ.Fort CollinsCO80523‐1170
2. USDA‐ARSNorthwest Irrigation and Soils Research Lab.3793N, 3600EKimberlyID83341
3. California Dep. of Food and AgricultureOffice of Pesticide Consultation & Analysis2800 Gateway Oaks Dr.SacramentoCA95833
4. Dep. of Earth and Environmental SciencesCalifornia State Univ. East Bay25800 Carlos Bee Blvd.HaywardCA94542