Monitoring and assessment of Tilia Cordata Mill. trees health condition in urban environment

Research of plant diversity : present ang future : abstracts of international scientific conferenece, June 27–28, 2013, KaunasThe aim of the research was to assess health condition of Tilia cordata Mill. on the local sca­ le in Vilnius city (Lithuania) green areas according to the impact intensity of fungal diseases and morphological indicator parameters (crown defoliation, foliage discolouration, amount of dead branches and fruiting grade). The damage of trees by the most frequent fungal disea­ se agents (Cytospora leucosperma, Diaporthe eres, Discula umbrinella, Flammulina velutipes, Fumago vagans, Nectria cinnabarina, Passaloramicrosora, Pholiota aurivella, Polyporus squammosus, Schizophyllum commune and Tyrostroma compactum) was assessed along the streets and in recreational plantings of Vilnius city in 2006–2010. It was found that the intensity of diseases depends on meteorological conditions: in dry and hot summer of 2006 the disease occurred to a lesser extent (average disturbance grade V varied from 1.3 ± 0.1 to 1.5 ± 0.0) and in the wet and warm summer (2010) – stronger (V varies from 2.5 ± 0.1 to 2.6 ± 0.0). It was assessed that the greatest part (70.7%) of sampled trees was moderately defoliated (crown defoliation 26–60%); slightly defoliated (11–25%) ones constituted 29.3% of the assessed trees. slightly dis­ colourated (foliage discolouration 11–25%) trees comprised 85.7%, moderately discolourated (26–60%) – 14.1% of the assessed trees. In recreational areas crown defoliation and foliage dis­ colouration of trees were of a lesser extent than in street plantings. Increasing crown defoliation and foliage discolouration are the signs of serious damages of the investigated treesAplinkotyros katedraBotanikos sodasVytauto Didžiojo universiteta