Soil Science DepartmentUniversity of ReadingLondon Road, Reading RG1 5AQUnited Kingdom

Becker UnderwoodAmes, Iowa

USDA-ARS

Soil-Microbial Systems LaboratoryRoom 108, Building 318, BARC East10300 Baltimore AvenueBeltsville, MD 20705-2350

Soil-Microbial Systems LaboratoryRoom 108, Bldg. 318, BARC East10300 Baltimore AvenueBeltsville, MD 20705-2350

Soil-Microbial Systems Laboratory Room 108, Building 318, BARC East10300 Baltimore AvenueBeltsville, MD 20705-2350

USDA-ARS

Soil-Microbial Systems LaboratoryRoom 108, Building 318, BARC East10300 Baltimore AvenueBeltsville, MD 20705-2350

Instituto de Ecologia y Sistematica, MINCITEMA, Carr. de Varona km 3.5, Capdevila, Boyeros, A.P. 8010, C. de La Habana, 10800, Cuba

Plant Pathology Dept.Montana State UniversityBozeman, MT 59107