Bastard-Toadflax Rust vs Chrysanthemum White Rust

Puccinia thesii compared with Puccinia horiana

Taxonomic Classification

Rank	Bastard-Toadflax Rust	Chrysanthemum White Rust
Kingdom same	Fungi (грибы)	Fungi (грибы)
Phylum same	Basidiomycota (базидиомицеты)	Basidiomycota (базидиомицеты)
Class same	Pucciniomycetes (Pucciniomycetes)	Pucciniomycetes (Pucciniomycetes)
Order same	Pucciniales (Пукциниевые)	Pucciniales (Пукциниевые)
Family same	Pucciniaceae	Pucciniaceae
Genus same	Puccinia	Puccinia
Species	Puccinia thesii	Puccinia horiana

Evolutionary Relationship

Bastard-Toadflax Rust and Chrysanthemum White Rust share a common ancestor at the Genus level: Puccinia.

Conservation Status

Bastard-Toadflax Rust

NE — Not Evaluated

Chrysanthemum White Rust

NE — Not Evaluated

Physical Characteristics

Attribute	Bastard-Toadflax Rust	Chrysanthemum White Rust
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bastard-Toadflax Rust

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Norway, and Portugal.

Chrysanthemum White Rust

Habitat

Native to Asia and Europe and South America, inhabiting ecosystems characteristic of the region.

Range

Widely distributed across Asia (Taiwan), Europe (12 countries), and South America (Brazil).

Bastard-Toadflax Rust

The Bastard-Toadflax Rust (Puccinia thesii) is a species in the genus Puccinia. Native to Europe, inhabiting ecosystems characteristic of the region. Its range includes Belgium, Norway, and Portugal. Its conservation status has not been formally evaluated by the IUCN.

Chrysanthemum White Rust

Chrysanthemum white rust is a disease caused by the fungal pathogen Puccinia horiana, a biotrophic rust fungus in the family Pucciniaceae. It is one of the most serious diseases affecting cultivated chrysanthemums globally and is classified as a quarantine pathogen in many countries. The disease was first described in Japan in the early twentieth century and has since spread to major chrysanthemum-producing regions worldwide through the international movement of infected plant material. Symptoms include pale green to yellow spots on the upper leaf surface corresponding to circular to angular white to pale pink pustules on the underside of the leaf, which produce masses of waxy, white teliospores. Unlike many rust fungi, Puccinia horiana has a simplified life cycle that does not require an alternate host, completing its development entirely on chrysanthemum. The fungus spreads readily via windborne spores, water splash, and contaminated cutting tools. Under cool, humid conditions with high relative humidity, infection can progress rapidly, causing extensive leaf damage and defoliation in severely affected plants. Strict phytosanitary measures including inspection of imported planting material, sanitation of growing facilities, and fungicide application are employed to manage the disease in commercial chrysanthemum production.

Shared Countries

Both species can be found in 3 countries:

🇧🇪 Belgium 🇳🇴 Norway 🇵🇹 Portugal