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Numerous studies indicate an accelerated growth of forest trees, induced by ongoing climate change. Similar trends were recently found for urban trees in major cities worldwide. Studies frequently report about substantial effects of climate change and the urban heat island effect (UHI) on plant growth. The combined effects of increasing temperatures, changing precipitation patterns, and extended growing season lengths, in addition to increasing nitrogen deposition and higher CO2 concentrations, can increase but also reduce plant growth. Closely related to this, the multiple functions and services provided by urban trees may be modified. Urban trees generate numerous ecosystem services, including carbon storage, mitigation of the heat island effect, reduction of rainwater runoff, pollutant filtering, recreation effects, shading, and cooling. The quantity of the ecosystem services is often closely associated with the species, structure, age, and size of the tree as well as with a tree’s vitality. Therefore, greening cities, and particularly planting trees, seems to be an effective option to mitigate climate change and the UHI. The focus of this Special Issue is to underline the importance of trees as part of the urban green areas for major cities in all climate zones. Empirical as well as modeling studies of urban tree growth and their services and disservices in cities worldwide are included. Articles about the dynamics, structures, and functions of urban trees as well as the influence of climate and climate change on urban tree growth, urban species composition, carbon storage, and biodiversity are also discussed.

green spaces --- urban heat island --- Landsat TM --- human health --- root:shoot ratio --- choice experiment --- urban trees --- BVOC emission --- climate change --- urbanity --- urbanization --- sustainability --- drought stress --- ecosystem disservices --- tree growth --- Greenway --- oxides --- hot arid urban climate --- carbon sequestration --- abundance --- landscape planning --- bud break --- urban microclimate --- tree competition --- urban forest --- allergenic potential --- sampling plots --- climate change implications --- ecosystem modeling --- preferences --- urban parks --- basal area --- urban tree growth --- air pollution removal --- environmental quality --- species richness --- surface temperature --- drought --- growing season --- air pollution --- ecosystem services --- biomass allocation

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The 22 papers that make up this Special Issue deal with pathogen and pest impact on forest health, from the diagnosis to the surveillance of causative agents, from the study of parasites’ biological, epidemiological, and ecological traits to their correct taxonomy and classification, and from disease and pest monitoring to sustainable control strategies.

Research & information: general --- Biology, life sciences --- Forestry & related industries --- plant destroyers --- disease diagnosis --- RxLR-dEER --- soil-borne pathogen --- exclusivity --- inclusivity --- Phlebiopsis gigantea --- EF1α --- introns --- exons --- phylogenesis --- non-host attack --- post-epidemic --- facilitation --- endemic population strategies --- leaf baiting --- rDNA ITS regions --- soil --- water --- ITS clades --- Mediterranean vegetation --- ecology --- soil inhabitants --- aquatic species --- biodiversity --- bark beetles --- symbionts --- species assemblage --- beta diversity --- forest ecosystems --- Thaumetopoea pityocampa --- seasonal flight activity --- sexual pheromone traps --- Pinus sylvestris --- forest insect pest --- population suppression --- leaf litter --- forest management --- arthropods --- Norway spruce --- Heterobasidion root rot --- primary infection --- secondary infection --- first rotation forest --- afforestation --- Asian gypsy moth --- Lymantria dispar --- invasive species --- forest pests --- natural enemies --- aggregation pheromones --- pest management --- Mediterranean pine forests --- Emerald ash borer --- Agrilus planipennis --- post-invasion conditions --- insect traps --- prism trap --- Fraxinus americana --- DNA-based diagnostics --- LAMP --- Dothistroma needle blight --- ‘Candidatus Phytoplasma’ species --- 16Sr group/subgroups --- PCR --- yellows diseases --- witches’ broom --- phloem discoloration --- die-back --- phytoplasma strains --- etiology --- eucalyptus little-leaf --- disease incidence --- Anoplophora chinensis --- temperature --- survival --- reproduction --- fecundity --- biocontrol --- bioinsecticide --- entomopathogen --- microbial --- ecosystem --- basidiospores --- conidia --- Heterobasidion spp. --- spore dispersal --- susceptibility --- wood discs --- Dothistroma septosporum --- Mycosphaerella pini --- loop-mediated isothermal amplification --- molecular diagnostics --- field-portable diagnostics --- Pinus nigra subsp. laricio --- forest health protection --- forest conservation --- Biscogniauxia mediterranea --- oak decline --- dieback --- Site of Community Importance (S.I.C.) --- tree competition --- warming conditions --- Diplodia tip blight --- Pinus densiflora --- plant diversity --- Sphaeropsis sapinea --- stand type --- vertical structure layer --- Heterobasidion --- carpophores --- fauna --- Tullgren funnels --- forest insects --- forest diseases --- diagnostics --- mitigation options --- citizen science --- fungi --- insects --- diagnosis --- surveillance --- disease and pest management --- plant destroyers --- disease diagnosis --- RxLR-dEER --- soil-borne pathogen --- exclusivity --- inclusivity --- Phlebiopsis gigantea --- EF1α --- introns --- exons --- phylogenesis --- non-host attack --- post-epidemic --- facilitation --- endemic population strategies --- leaf baiting --- rDNA ITS regions --- soil --- water --- ITS clades --- Mediterranean vegetation --- ecology --- soil inhabitants --- aquatic species --- biodiversity --- bark beetles --- symbionts --- species assemblage --- beta diversity --- forest ecosystems --- Thaumetopoea pityocampa --- seasonal flight activity --- sexual pheromone traps --- Pinus sylvestris --- forest insect pest --- population suppression --- leaf litter --- forest management --- arthropods --- Norway spruce --- Heterobasidion root rot --- primary infection --- secondary infection --- first rotation forest --- afforestation --- Asian gypsy moth --- Lymantria dispar --- invasive species --- forest pests --- natural enemies --- aggregation pheromones --- pest management --- Mediterranean pine forests --- Emerald ash borer --- Agrilus planipennis --- post-invasion conditions --- insect traps --- prism trap --- Fraxinus americana --- DNA-based diagnostics --- LAMP --- Dothistroma needle blight --- ‘Candidatus Phytoplasma’ species --- 16Sr group/subgroups --- PCR --- yellows diseases --- witches’ broom --- phloem discoloration --- die-back --- phytoplasma strains --- etiology --- eucalyptus little-leaf --- disease incidence --- Anoplophora chinensis --- temperature --- survival --- reproduction --- fecundity --- biocontrol --- bioinsecticide --- entomopathogen --- microbial --- ecosystem --- basidiospores --- conidia --- Heterobasidion spp. --- spore dispersal --- susceptibility --- wood discs --- Dothistroma septosporum --- Mycosphaerella pini --- loop-mediated isothermal amplification --- molecular diagnostics --- field-portable diagnostics --- Pinus nigra subsp. laricio --- forest health protection --- forest conservation --- Biscogniauxia mediterranea --- oak decline --- dieback --- Site of Community Importance (S.I.C.) --- tree competition --- warming conditions --- Diplodia tip blight --- Pinus densiflora --- plant diversity --- Sphaeropsis sapinea --- stand type --- vertical structure layer --- Heterobasidion --- carpophores --- fauna --- Tullgren funnels --- forest insects --- forest diseases --- diagnostics --- mitigation options --- citizen science --- fungi --- insects --- diagnosis --- surveillance --- disease and pest management