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United States Department of Agriculture

Agricultural Research Service

Image Number K3146-1

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Image Number K3146-1

Plant pathologist Theodore O. Diener discovers the viroid, the smallest known agent of plant disease. His discovery is ranked among the top 10 milestones for plant pest and pathogen research by the American Phytopathological Society.

 

Photo by Barry Fitzgerald.


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Last Modified: 3/31/2010
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