1. USDA‐ARS Plant Germplasm Introduction and Testing Research Unit Washington State Univ. Pullman WA 99164‐6402
2. Department of Plant, Soil, and Entomological Sci. Univ. of Idaho Moscow ID 83843
3. Electron Microscopy Center Washington State Univ. Pullman WA 99164‐4210
4. USDA‐ARS Horticultural Crops Research Unit Corvallis OR 97330