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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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Image Number K3146-1

Plant pathologist Theodor O. Diener took the scientific world by surprise in 1971 when he discovered the viroid, a plant pathogen 80 times smaller than a virus.

Photo by Barry Fitzgerald.



640 pixels wide: (k3146-1.jpg)




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Last Modified: 5/23/2006
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