Albugo tragopogonis var. tragopogonis

are pathogens of

• Global Biotic Interactions: Senecio vulgaris L. (groundsel)
• Global Biotic Interactions: Senecio squalidus L. (oxford ragwort)
• Global Biotic Interactions: Pericallis hybrida B. Nord. (common ragwort)
• Global Biotic Interactions: Senecio vulgaris L. (groundsel)

have host

• Global Biotic Interactions: Senecio vernalis Waldst. & Kit. (eastern groundsel)
• Global Biotic Interactions: Podospermum canum C. A. Mey.
• Global Biotic Interactions: Cyclachaena xanthiifolia (Nutt.) Fresen.

parasitize

• Global Biotic Interactions: Tragopogon porrifolius L. (salsify)
• Global Biotic Interactions: Scorzonera hispanica L. (black salsify)
• Global Biotic Interactions: Tragopogon pratensis L. (jack-go-to-bed-at-noon)
• Global Biotic Interactions: Cirsium arvense (L.) Scop. (Creeping Thistle)
• Global Biotic Interactions: Centaurea scabiosa L. (greater knapweed)