Exobasidium vexans

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Exobasidium vexans symptoms on Camellia sinens (click on image to enlarge it)
Author(s): Jürgen Kranz
Source: Wikimedia Commons

Exobasidium vexans Massee - (blister blight of tea)

This fungus infects tea plants (Camellia sinensis) in Asia, causing the blister blight disease. It is of quarantine concern in other tea-growing regions like East Africa. Outbreaks can result in up to 40% yield losses.

Infections start as reddish, yellowish or green leaf spots. These enlarge, become whitish, hollow and eventually burst, releasing elliptical basidiospores which are around 20 µm long and 5 µm wide. These spores disperse by wind and initiate new infections.

Vernacular names
• Deutsch: Blasenkrankheit des Tees
• English: blister blight of tea
• Español: agallas de las hojas del té
• Français: cloque du théier