1. Dep. of Plant Sciences and Plant Pathology, 119 Plant BioSciences Montana State Univ. Bozeman MT 59717‐3150
2. E.202, FSHN Facility East, USDA‐ARS Washington State Univ. Pullman WA 99163
3. Dep. of Animal and Range Sciences, 230C Linfield Hall Montana State Univ. Bozeman MT 59717
4. This research was supported by USDA‐ARS National Research Initiative Competitive Grant Program grant 2004‐35301‐14538 and by the Montana Agricultural Experiment Station