Pest Alert: Plum Pox
Download the Plum Pox Pest Alert (Adobe PDF, 1.8 MB)
http://sharka.cas.psu.edu/ by Penn State University
http://pubs.cas.psu.edu/freepubs/pdfs/ul204.pdf "Plum Pox Virus of Stone Fruits" from Penn State University
http://plantclinic.cornell.edu/FactSheets/plumpoxvirus/plumpox.htm "Plum Pox Virus Fact Sheet" by Cornell University
http://www.apsnet.org/online/feature/PlumPox/ "Plum Pox Potyvirus Disease of Stone Fruits" by The American Phytopathological Society
http://www.caf.wvu.edu/Kearneysville/disease_descriptions/ppvresources.html "Plum Pox Virus (Sharka) Resources" by West Virginia University
http://www.aphis.usda.gov/plant_health/plant_pest_info/plum_pox/index.shtml "Plum Pox" by USDA/APHIS
http://www.ars.usda.gov/research/docs.htm?docid=14271 "National Plant Disease Recovery System" by USDA/ARS. Click on "Plum Pox or Sharka"
These are just a few of the references for Plum Pox Virus. To find others, do a search on "Plum Pox Virus".