Naslov
Current status of ash dieback disease Hymenoscyphus fraxineus in Croatia

Autori
Milotić, Marno ; Kranjec, Jelena ; Diminić, Danko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts / Radojčić Redovniković, Ivana ; Radošević, Kristina ; Jakovljević, Tamara ; Stojaković, Renata ; Gaurina Srček, Višnja ; Erdec Hendrih, Dina - Zagreb : Prehrambeno-biotehnološki fakultet Sveučilišta u Zagrebu, 2016, 124-124

ISBN
978-953-6893-03-4

Skup
Natural resources, green technology & sustainable development 2

Mjesto i datum
Zagreb, Hrvatska, 05.10.2016. - 07.10.2016

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Hymenoscyphus fraxineus ; Fraxinus excelsior ; Fraxinus angustifolia ; ash dieback disease ; mitovirus HfMV1 ; disease control measures ; seed orchards ; genetic resistance

Sažetak
The indigenous ash species in Croatia have an important ecological and economical value especially in their microhabitats where they are irreplaceable. All three species together (Fraxinus excelsior L., Fraxinus angustifolia Vahl and Fraxinus ornus L.) have a total growing stock of almost 21 million m3. Since the first record in Eastern Poland and Lithuania in the 1990s the ascomycete fungus Hymenoscyphus fraxineus (T. Kowalski) Baral, Queloz & Hosoya (basyonim: Chalara fraxinea) has gradually spread across the continent, making this invasive pathogen a new primer threat to the sustainability of ash species in Europe. In Croatia the disease was first recorded on common ash (Fraxinus excelsior L.) in 2009 in the mountain area of Gorski kotar. Hymenoscyphus fraxineus in Croatia has been detected and isolated in natural stands from two of three native ash species, common and narrow-leaved ash (Fraxinus angustifolia Vahl). There was a significant temporal shift of isolations and confirmation of the disease on different ash species but the disease spread in just a few years from 5, 4 % to 89, 4 % of growing stock is remarkable. Attempts of isolation from the third native ash species Fraxinus ornus L., have not been successful in natural conditions up to date. Research conducted on Fraxinus excelsior so far revealed that there is significant difference among individuals, populations and families regarding their tolerance to the Hymenoscyphus fraxineus. That is why among the limited disease control measures, the most promising potential option would be to take advantage of natural occurring individuals resistance to the fungus. Implementation of feasible conservation measures in order to preserve the ash in its natural environment is of great importance as a part of sustainable forest management policies in Croatia. Because of the species preservation measures two clonal seed orchards of narrow- leaved ash were established for each of two provenance seed regions in Croatia. This allowed us to conduct preliminary pathogenicity tests with the pathogen Hymenoscyphus fraxineus on the familiar genotypic material. Fungal isolates were also tested for the presence of the mitovirus HfMV1 and considered as a potential control measure of the disease. Studies on susceptibility of F. angustifolia known genotypes to the fungal pathogen H. fraxineus is still an underestimated subject and although a lot of work has been done on genetic resistance of the F. excelsior clones to related pathogen, F. angustifolia as a species has a potential to give us astonishing new results.

Izvorni jezik
Engleski

Znanstvena područja
Šumarstvo

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