Phakopsora euvitis

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Phakopsora euvitis symptoms on grape leaf (click on image to enlarge it)
Author(s): Andrew M. Daly, Northern Territory Government, DPIFM
Source: PaDIL

Phakopsora euvitis Y. Ono 2000 - (grapevine leaf rust)

The fungus is found in Asia and the Americas on different Vitis species. It has been also reported from the Northern Territory of Australia, but was successfully eradicated in a campaign from 2001 to 2007. The fungus causes small necrotic lesions on the upper side of the leaves. On the lower side the lesions show yellowish to orange spore-producing uredia. Infections result in premature defoliation during fruit ripening and reduced yield and quality. The fungus is wind-borne and disperses by means of urediniospores or aeciospores.

Vernacular names
• Deutsch: Rost der Weinrebe
• English: grapevine leaf rust
• Español: roya de la vid
• Français: rouille de la vigne
• Português: ferrugem da videira

The urediniospores are slightly oval, around 20 x 15 µm large, covered with small spines. Dark brown to black telia are later formed around the uredia or separately. Teliospores are brownish and elongated, approximately 20 x 10 µm in size. Basidiospores are kidney-shaped and about 10 µm long. Pycnidia and aecia are formed on the alternate host, trees of the genus Meliosoma (Sabiaceae). However, they have been only observed in Asia. In other regions urediniospores are the sole inoculum source (microcyclic life cycle). Aeciospores are almost sperical and 15-20 µm large.

For a review see Primiano et al., 2017.