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City Beltsville / / Company Molecular Plant Pathology Laboratory / / Country United States / / / Event Natural Disaster / / Facility Plant Diseases / / IndustryTerm farm products / / MedicalCondition disease / viroid infection / viroid disease / naked RNA pathoviroid infection / diseases / infection / Plant Diseases / / Organization Suter-Webb / Oklahoma State University / USDA / / Person Robert E. Davis / Robert A. Owens / Peggy Greb / Yan Zhao / Robert Owens / Rosemarie Hammond / Edward F. Knipling / Jan Suszkiw / Theodor O. Diener / / / Position Governor / pathologist / ARS plant pathologist / messenger / reporter / molecular biologist / Chemist / / ProvinceOrState Maryland / / Technology http / cloning / / URL www.nps.ars.usda.gov/programs/cppvs.htm / / SocialTag 
VIROIDS! From Scourge to Boon in the 21st Century? This lower leaf of Etrog citron, an indicator host, shows typical symptoms of viroid infection—necrotic cells on the midvein and