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Plant Industry Services - Plant Pathology Program

Plant Pathology
Facilities and Contacts
How to Submit a Sample
Updates and Reports

Diseases of regulatory concern
   Box blight (Cylindrocladium pseudonaviculatum=Cy. buxicola)
   Chrysanthemum white rust
   Phytophthora ramorum
   Plum pox virus
   Potato cyst nematodes

   Thousand Cankers Disease

Chrysanthemum white rust (Puccinia horiana)Photo of chrysanthemum white rust.

Chrysanthemum white rust (CWR) is a USDA quarantined plant pathogen that poses a potential trade barrier to growers of chrysanthemums in Virginia if introduced. The disease also poses a risk of increasing management costs if introduced into the Commonwealth as control of this pathogen requires weekly fungicide applications. For these reasons, VDACS plans to continue monitoring and eradication efforts to keep this pathogen out of the Commonwealth. In 2009, an estimated 15,000 Chrysanthemums were inspected state-wide by VDACS nursery inspectors for CWR. In 2010, over 100,000 plants were inspected by VDACS.

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