Chrysanthemum White Rust (Puccinia horiana)
Chrysanthemum White Rust (Puccinia horiana) infects at least twelve species of Chrysanthemum and is a devastating
disease of horticultural varieties of chrysanthemums grown under glasshouse conditions. The fungus has been
detected coming into the U.S. on infected plants, cuttings, and cut flowers from foreign sources such as Mexico,
Venezuela and the Netherlands. Chrysanthemum White Rust has been introduced, detected and eradicated at sites in
California, New Jersey, Washington, Oregon, New York, Rhode Island, Pennsylvania and Delaware so it has been
identified as an emerging plant pest. As Ohio is a major garden chrysanthemum producer and shipper early detection
may help prevent establishment of the disease in Ohio and spread of the disease throughout the U.S. This disease
is a USDA quarantine pest.
If you suspect you have found a chrysanthemum white rust infection contact the Ohio Department of Agriculture
Plant Pest Control Section.
Fact Sheet
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