Podosphaera xanthii

Podosphaera xanthii
Scientific classification
Kingdom:	Fungi
Division:	Ascomycota
Class:	Leotiomycetes
Order:	Erysiphales
Family:	Erysiphaceae
Genus:	Podosphaera
Species:	P. xanthii
Binomial name
Podosphaera xanthii (Castagne) U. Braun & Shishkoff, 2000

Podosphaera xanthii is a species complex ^[1] of fungal plant pathogens that causes powdery mildew disease of a range of different host species. The primary symptoms are white, powder-like spots on the leaves and stems. P. xanthii sensu stricto affects plants in the genus Xanthium (cocklebur).

Description

The fungus appears as white patches of mycelium on its host plant. Like most powdery mildews, Podosphaera xanthii is highly host-specific and is only found on a single genus of plants ( Xanthium ). However, the species was formerly very broadly defined, and was recorded as occurring on a vast array of hosts, including ones commonly planted in gardens such as Cucurbita . ^{[2] [3]} These records are not assigned to a strict species, and are said to belong to the Podosphaera xanthii complex, rather than the species sensu stricto.

Taxonomy

The species was described in 1845 by Castagne with the basionym Erysiphe xanthii. The species was transferred to the genus Podosphaera in 2000 by Braun and Shishkoff. Some researchers formerly considered P. xanthii to be a synonym of Podosphaera fusca . ^[1]

References

1. Braun, Uwe; Cook, Roger T.A. (2012). Taxonomic manual of the Erysiphales (powdery mildews). CBS Biodiversity Series. ISBN   9789070351892.
2. PéRez‐GarcíA, Alejandro; Romero, Diego; FernáNdez‐OrtuñO, Dolores; LóPez‐Ruiz, Francisco; De Vicente, Antonio; ToréS, Juan A. (2009). "The powdery mildew fungus Podosphaera fusca (synonym Podosphaera xanthii ), a constant threat to cucurbits". Molecular Plant Pathology. 10 (2): 153–160. doi:10.1111/j.1364-3703.2008.00527.x. ISSN   1464-6722. PMC   6640438 . PMID   19236565.
3. Babadoost, Mohammad; Sulley, Salisu; Xiang, Yiwen (2020). "Sensitivities of Cucurbit Powdery Mildew Fungus (Podosphaera xanthii) to Fungicides". Plant Health Progress. 21 (4): 272–277. doi:10.1094/PHP-04-20-0031-RS.