1. United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Molecular Plant Pathology Laboratory, Beltsville, MD 20705-2350, U.S.A.
2. School of Plant and Environmental Science, Virginia Tech, Blacksburg, VA 24061, U.S.A.
3. NemaLab, MED–Mediterranean Institute for Agriculture, Environment and Development, Departamento de Biologia, Escola de Ciências e Tecnologia, Universidade de Évora, Pólo da Mitra, Ap. 94, 7006-554 Évora, Portugal
4. INIAV, I.P.–Instituto Nacional de Investigação Agrária e Veterinária, Quinta do Marquês, 2780-159 Oeiras, Portugal
5. Electron & Confocal Microscopy Unit, USDA-ARS, Beltsville, MD 20705, U.S.A.