slen
life.artemis@tujerodne-vrste.info
slen
life.artemis@tujerodne-vrste.info

Projekt LIFE ARTEMIS – Osveščanje, usposabljanje
in ukrepanje za invazivne tujerodne vrste v gozdu

Ash dieback

Hymenoscyphus fraxineus

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Okužba listov. Foto: Dušan Jurc
Odmiranje skorje. Foto: Dušan Jurc
Podogobje mraznice (Armillaria sp.). Foto: Nikica Ogris
Rovni sistemi pisanega jesenovega ličarja (Leperesinus fraxini) na jesenu, ki je odmrl zaradi jesenovega ožiga. Foto: Nikica Ogris

NATIVE RANGE: East Asia (China, Korea, Japan)

FIRST FINDING IN SLOVENIA: 2006

PATHWAYS: transported by people with tree cutting tools. Secondary spreading by wind and insects

POSSIBLE TO FIND: year-round

DESCRIPTION: Symptoms of this diseases include brown lesions on leaves and leaf-petioles, which are the entry points of the fungi. Later, the fungus infects bark and causes lesions and dieback of shoots. Oval lesions ap-pear on the bark of the trunk, which quickly increase in size. Sometimes the tree does not die back but a canker is formed at the wound. Trees are often heavily infected and many branches die back but, at the same time, the tree also forms new shoots.

HOST PLANTS: Common ash (Fraxinus excelsior) and narrow-leaved ash (F. angustifolia) are particularly susceptible, while manna ash (F. ornus) is unaffected.

STATUS: Widespread throughout Europe.

SIMILAR SPECIES: Dieback of ash trees may also be caused by honey fungi (Armillaria spp.), which cause armillaria root disease. Weakened and dying trees are of-ten attacked by ash bark beetles, for example Leperesinus fraxini.

SOURCE: Field Guide to Invasive Alien Species in European Forests

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