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Petri's disease

Petri disease (GB)

The dangerous vine disease is named after the Italian plant pathologist Lionello Petri (1875-1946), who first described it in 1912. The name was coined by the US ampelographer Lucie Morton Garrett. On a larger scale, it was in from the 1950s South Africa observed. It is also known as Black goo disease , Black Xylem Decline (BXD) and Young Vine Decline (YVD) (decline = decline). In particular, the term black goo disease (or decline) aptly describes the typical symptoms of the disease, which are characterized by black spots and dark, viscous, droplet-like mucus secretions (gummosis = gum flow) at the interfaces of sawn-off strains of the diseased vines demonstrate. In the early 1980s, she appeared in newly planted vineyards California on. After that there was also in Australia. New Zealand and some European countries.

ESCA and Petri disease - leaf symptoms and infected Grüner Veltliner stick

The cause is the two mushrooms Phaeomoniella and Phaeoacremonium. The mushrooms penetrate the xylem of the trunk, part of the leading tissue and prevent the supply of nutrients and water. The vine dies after a while. In combination with other types of mushrooms and increasing vine age, this appears to be the disease Esca to develop. That is why it is also known as its precursor disease or “Young Esca”. The disease is spread by infected vine material, such as one finishing, It is successfully fought by hot water. The symptoms are quite similar Blackfoot disease, See also a complete listing of all plagues and diseases below Vine enemies,

Images: by Bauer Karl - Own work, CC BY 3.0 at , Link und Link

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