Live Tree Lab

LiveTreeLab as approach for raising knowledge on tree health in Ljubljana city

LiveTreeLab as approach for raising knowledge on tree health in Ljubljana city

The City of Ljubljana has 290,000 inhabitants and covers 275 km2. The characteristics of the city lies in its extensive greenery including 110.8 km2 of forests and the fact that the forest cover penetrates the city centre from two sides. Nevertheless, Ljubljana area is classified as urban heat islands of the 2nd level, their intensity reaching up to 1.8 °C and on average 0.58 ± 0.10 °C warmer than the surrounding area.A number of thermophilic or thermotolerant pathogenic fungi, as well as insect pests are causing extensive damages, weakening or mortality to trees in urban green areas. In the city we are developing forest laboratory named LiveTreeLab for the research, inventory and public co-monitoring of harmful biotic factors that influence the health of woody plants, their impact on the stability and structure of trees and the development of new saproxylic habitats. According to the pilot study made in the years 2010-2018 numerous harmful native and introduced alien species have been detected. The most important among native pests are Thaumetopoea procesionea, Ips typographus, Pityogenes chalcographus, but invasive alien species from ordo Heteroptera, Homoptera and Lepidoptera are more numerous. Some new pathogens have been detected: Pseudomonas syringae pv. aesculi, Erysiphe arcuata, E. elevata, E. flexuosa.The main factor of physical destabilization of weakened trees are wood degrading fungi (Ganoderma spp., Armillaria spp., Schizophyllum commune, Fomes fomentarius, Laetiporus sulphureus, Kretzschmaria deustaand many others). Activities to undestand harmful factors is only the first step towards developing efficient methods for the preservation of urban trees and forest health by involving volunteers and interested public. Together we work on preserving old decaying trees, if they neither pose a threat to the spread of harmful organisms nor pose a risk for visitors, as they represent important habitats of evolving saproxylic organisms.


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