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   What are Phytoplasmas

 Symptoms glossary

 Disease pictures

 Phytoplasmas Spread

 Insect Vectors

 Classification NEW!


 Taxonomy NEW!

 'Candidatus species'NEW!





Welcome to the
Phytoplasma Resource Center

hosted by the
Molecular Plant Pathology Laboratory (MPPL)

Cone flower infected with phytoplasma

Phytoplasma: diseases, disease pictures, symptoms, classification, databases, detection and identification, phylogeny, taxonomy, and Genomics.

Dr. Wei Wei, Research Plant Pathologist, wei.wei@usda.gov
United States Department of Agriculture Building 004, BARC-West
10300 Baltimore Ave. Beltsville, MD. 20705

Should you find these data useful and wish to reference it, please acknowledge the Phytoplasma Resource Center and W. Wei and J. Shao. Please contact Dr. Wei Wei, (wei.wei@usda.gov), if you have any questions or concerns.

If possible, please send us both the literature citation once published and a reprint or PDF file of the publication.

Please retain photo credits on pictures used from this site.

Thanks to Wei Wei, Yan Zhao, Stefano Costanzo, Kristi Bottner-Parker, Jonathan Shao, Robert E. Davis, Ing-Ming Lee. Molecular Plant Pathology Laboratory, U.S. Department of Agriculture, Agricultural Research Service, Beltsville, MD 20705




Note: Phytoplasma classification database (update under construction) May 2024.

taxonomic assignment
group/subgroup classification
virtual gel analysis
pattern similarity coefficients.

In silico RFLP
analysis & automated
calculation of similarity

 Grapevine Yellows

 Phytoplasma primers
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