Chrysanthemum white rust

Chrysanthemum white rust
Pustules caused by chrysanthemum white rust
Scientific classification
Kingdom:	Fungi
Phylum:	Basidiomycota
Class:	Urediniomycetes
Order:	Uredinales
Family:	Pucciniaceae
Genus:	Puccinia
Species:	P. horiana
Binomial name
Puccinia horiana Henn. 1901

Chrysanthemum white rust is a disease of plants caused by the fungus Puccinia horiana that infects species of the genus Chrysanthemum.

Origin and Spread

Chrysanthemum white rust was first identified in Japan, although it is now established throughout Asia, Europe, South America.^[1] It has been found in the United States, Australia, and New Zealand on several occasions, but early detection and eradication efforts have prevented the disease from becoming established in these countries.^[2]

Symptoms

Plants infected by chrysanthemum white rust exhibit spots on the upper surfaces of leaves. These spots are initially pale-green to yellow in color and up to 5mm in diameter, but may turn brown as the tissue becomes necrotic. On the underside of the leaf, the spots develop into pink or white pustules that become prominent as the teliospores develop.^[2]

References

1. ^ Data Sheets on Quarantine Pests. European and Mediterranean Plant Protection Organization. Retrieved on 2008-11-21.
2. ^ ^{a b} Invasive and Emerging Fungal Pathogens - Diagnostic Fact Sheets. Hernández, J.R. Systematic Mycology and Microbiology Laboratory, ARS, USDA. 2004. Retrieved on 2008-11-21.