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Stan drzew pomnikowych w Świdnicy

63%
The work analyses the condition of forty nine trees in Świdnica (in the Lower Silesian Voivodship). The listed trees in this town belong to eighteen species, half of which are native and half foreign to our flora. The vast majority are angiosperms. The majority of the listed trees at Świdnica are English Oak (Quercus robur), the rarest examples include Common Ash (Fraxinus excelsior), Silver Maple (Acer saccharinum), White Mulberry (Morus alba), False Acacia (Robinia pseudoacacia) and Dutch Elm (Ulmus ×hollandica). The majority (59.2%) of the trees are in good health, while 22.4% require urgent arboricultural work.
The health status of 6−16−year−old poplars (mostly Populus robusta) in the sanitary protection zones around Legnica and Głogów copper mills (SW Poland) is described. The health of the poplars was assessed as a frequency of trees with symptoms of stem canker and occurrence of virus diseases on leaves. Fungi were isolated from 24 samples of canker wood (20×20×20 cm each) in five afforested complexes and then identified on the basis of colony morphology and sporulation on PDA and SNA after 40 days of incubation. Cankers occurred on <5−95% of poplar trees. Poplar mosaic virus was observed sporadically in collections of P. robusta, P. balsamifera and P. gerlica. The canker wood was colonized by 20 species of facultative pathogens. Acremonium pteridii, Exophiala sp. and Gibberella baccata were the most common and frequent (in 4−5 complexes). Aureobasidium pullulans, Epicoccum nigrum and Fusarium solani occurred in 3−4 complexes. Alternaria alternata, Cadophora fastigiata, Didymella molleriana, Fusicolla aquaeductuum, Gibberella avenacea, Graphium sp., Leptosphaeria maculans, Nectria inventa, Phoma herbarum, P. minutella, Sarocladium strictum, Trichosporon ovoides and Valsa sordida were less frequent and often occurred only locally. The fungi recorded may serve as indicators of the vitality and health status of trees in industrial zones. The best approach to eliminate the risk of colonization by pathogens is to maintain trees in a state of vigorous growth. Management practices that promote good growth include fertilization, watering during drought, avoidance of unnecessary wounding of trunk and roots, and using correct pruning procedures.
The subject of this paper is a stand of yew trees growing in Purda Leśna forest range (Wipsowo Forest District, Warmińsko-Mazurskie Voivodeship), localized near the eastern border of the species’ range. In total 25 individuals of T. baccata from this locality were first described, measured and mapped in 1958. After over 50 years, 19 remaining trees were measured and described again, which gave the opportunity to investigate the growth dynamic and changes in health and condition of the yew trees. This paper compares the results of both measurements and observations. The research was done at the end of August 2010 during a student scientific camp organised by the Institute of Forest Sciences, Łódź University.
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