Puccinia horiana(PUCCHN)
Distribution details in United States of America
Current pest situation evaluated by EPPO on the basis of information dated
2026: Transient
First recorded in: 1977
From CABI Disease map 403 (2008): Absent, pest eradicated
First recorded in: 1977
From CABI Disease map 403 (2008): Absent, pest eradicated
From NPPO: Absent, pest eradicated
First found in USA in 1977/1978 in New Jersey, New York and Pennsylvania. Outbreaks are occasionally reported but are always subject to eradication measures.
Studies done on a few plants which had been found infected in 2010 in 6 outdoor garden locations in University Park (Pennsylvania) showed that the fungus could overwinter in Pennsylvania (the disease was observed again in 2012).
USDA-APHIS (2026): no longer regulated as quarantine pest.
Studies done on a few plants which had been found infected in 2010 in 6 outdoor garden locations in University Park (Pennsylvania) showed that the fungus could overwinter in Pennsylvania (the disease was observed again in 2012).
USDA-APHIS (2026): no longer regulated as quarantine pest.
* O'Keefe G (2012) First confirmed report that Puccinia horiana, causal agent of chrysanthemum white rust, can overwinter in Pennsylvania. Plant Disease 96(9), p 1381.
* Punithalingam, E. (1968) Puccinia horiana. CMI descriptions of pathogenic fungi and bacteria n°176. (CAB).
* USDA-APHIS (2026) Notice of decision to deregulate chrysanthemum white rust and the importation of Chrysanthemum spp. cuttings, and in vitro plantlets, and synonymous taxa from certain countries into the Continental United States. APHIS-2021-0081. Available at https://www.regulations.gov/
* Punithalingam, E. (1968) Puccinia horiana. CMI descriptions of pathogenic fungi and bacteria n°176. (CAB).
* USDA-APHIS (2026) Notice of decision to deregulate chrysanthemum white rust and the importation of Chrysanthemum spp. cuttings, and in vitro plantlets, and synonymous taxa from certain countries into the Continental United States. APHIS-2021-0081. Available at https://www.regulations.gov/
| Country | State | Status | |
|---|---|---|---|
| Canada | British Columbia | Absent, pest eradicated | |
| Canada | Absent, pest eradicated | ||
| Canada | Ontario | Absent, pest eradicated | |
| Mexico | Present, few occurrences |