146 SjÖman et al.: Host Trees for Wood-Boring Pests: An Urban Forest Perspective Table 2. Categorization of poplar species as hosts for ALB according to Gao et al. (1997), Ludwig et al. (2002), Wang (2004), Yin and Lu (2005), Yang (2005), and Hu et al. (2009). Category Very good hosts Species/hybrids Populus nigra: ‘Pyramidalis’, ‘Italica’, ‘Thevestina’ Populus deltoides ‘Brangarsi’ Populus × euramericana: ‘Luisa Avanzo’, ‘Bellini’, ‘Guardi’ Populus × xiaozhuannica, P. × xiaozhuannica: ‘Opera’, ‘Popularis’ Good hosts Populus nigra Populus deltoides Populus lasiocarpa Populus pseudoglauca Populus cathayana Populus gansuensis Populus pseudosimonii Populus simonii Populus ussuriensis Populus simonii × P. nigra ‘Pyramidalis’: ‘Baichensis’, ‘Taiqing’, ‘Italica’ Populus nigra × P. simonii Populus × beijingensis Populus × berolinensis Populus × dakuanensis Populus × russki Populus stalinetz Populus × xiaohei, P. × xiaohei ‘Heilin-1’ Occasional hosts Populus deltoides: ‘Nankang’, ‘Qingji #1, 2’, ‘Shanhaiguan’, ‘pyramidalis’ Populus balsamifera Populus alba ‘Pyramidalis’ Populus alba × Populus bolleana Populus alba × Populus tomentosa Populus deltoides × P. simonii Populus × euramericana (= P. × canadensis) Populus × euramericana ‘Veruirubens’, ‘Vegeherata 272’, ‘G-158’, ‘I-214’, ‘Triplo’, Gattoni’, ‘Cima’ Rare hosts or resistant hosts Populus euphratica, P. euphratica: ‘Pyramidalis’, ‘PE-214’ Populus pruinosa Populus alba Populus davidiana Populus hopeiensis Populus tomentosa, P. tomentosa ‘Hopeinica’, ‘Honanica’ Populus tremula Populus tremuloides most susceptible (Appendix 1 and Table 2). In the division between poplar species with differing sus- ceptibility to ALB, it is obvious that there are dif- ferences between sections in the genus, with species within the sections Populus and Turanga even being classified as resistant or rarely infested (Table 2). The compilation on CLB included fewer publica- tions describing host trees. However, the number of host species described was much greater than for ALB. In total, 108 species were described as a potential host for CLB, while the number of genera was 73 (Appendix 2). In the literature reviewed, no species or genus was described as resistant or rarely affected by CLB. The spe- cies described most frequently as a host to some degree were Acer palmatum and A. platanoides, followed by A. pseudoplatanus and Aesculus hippocastanum. The genera described most comprehensively as a good host ©2014 International Society of Arboriculture Section Aigeiros Aigeiros Aigeiros Aigeiros × Tacamahaca Aigeiros Aigeiros Leucoides Leucoides Tacamahaca Tacamahaca Tacamahaca Tacamahaca Tacamahaca Aigeiros × Tacamahaca Aigeiros × Tacamahaca Aigeiros × Tacamahaca Aigeiros × Tacamahaca Tacamahaca Aigeiros Aigeiros Aigeiros × Tacamahaca Aigeiros Tacamahaca Populus Populus Populus Aigeiros × Tacamahaca Aigeiros Aigeiros Turanga Turanga Populus Populus Populus Populus Populus Populus for CLB were Acer spp., Malus spp., and Citrus spp., fol- lowed by Populus spp. and Platanus spp. (Appendix 2). In an attempt to make an up-to-date compilation of host trees for ALB and CLB, researchers identified great confusion in the literature, which weakened the information and may lead to incorrect conclu- sions and recommendations. In host-related publi- cations, there was much cross-referencing between the papers, making it difficult to identify the origin of the information and how it was obtained. Since a large proportion of the publications on ALB are in Chinese, it is even more difficult to evaluate the background to the conclusions presented in abstracts. Later publications, basing their informa- tion on Chinese and Japanese studies (e.g., Haack et al. 1997; Nowak et al. 2001; Lingafelter and Hoebeke 2002; Yin and Lu 2005; Yang 2005; Hu et al. 2009),
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