Arboriculture & Urban Forestry 34(2): March 2008 Table 1. Size and health ratings of serviceberry cultivars planted as street trees with two cultivars paired at most locations.z Cultivar/abbrev. Paired cultivar Year Diam (cm) Ht (m) Width (m) Autumn Brilliance/AB Cu 12 8.9y 5.0y 4.3x Autumn Brilliance Autumn Brilliance Autumn Brilliance Autumn Brilliance Autumn Brilliance Autumn Brilliance Autumn Brilliance Foliage (1 to 5) 4.1x Tr 12 6.3y 4.1y 3.7 4.7 Tr 12 8.5 4.7x 3.8x 3.4 Tr 12 9.6 4.9 4.9 3.3 Cu 12 8.8y 3.9y 4.1 4.7x PD 9 7.9 4.6 4.1 4.6 CS 7 5.0 4.0 3.1 4.4 CS 6 4.5 4.1 2.2 4.2 Cole’s Select/CS AB 7 5.5 4.1 3.1 4.5 Cole’s Select Cumulus/Cu Cumulus Cumulus Cumulus Cumulus Cumulus Cumulus AB 6 4.6 4.1 2.4 4.3 RH 12 11.6 5.5 2.9 4.5 AB 12 11.9x 7.3x 3.8y Reflection™/Re Reflection™ Robin Hill/RH Robin Hill Robin Hill Robin Hill Robin Hill Branches (1 to 5) 2.8y RH 11 9.3 5.6 — 4.0 RH 12 9.1 6.3 4.6 3.9 RH 12 12.8 7.2x 4.0y 3.5 AB 12 13.6x 6.4x 4.4 4.2y RH 9 12.0 5.5y 5.0 4.2 Princess Diana/PD AB 9 8.0 4.4 4.0 4.5 Tr 10 8.9 4.8 3.1y 4.0 SG 9 7.9 4.3 3.0 4.3 Cu 12 10.9 5.5 2.9 4.5 Cu 11 9.7 5.6 — 4.1 Cu 12 10.3 6.8 4.7 3.9 Cu 12 12.5 6.0y 4.7x 3.6 Spring Glory/SG Tradition/Tr Tradition Tradition Tradition Tradition Average trunk diameter, tree height, and crown width are in the most advanced year; foliage health and branch health ratings are averaged over all years:1,2,3, z 6, 9, and 12 in most cases. y than 5%. x Significantly smaller at 95% level than corresponding value of the paired culti- var. Foliage and branch health ratings: 1 65% to 100% of leaves or branches exhibit injury, 2 45% to 60%, 3 25% to 40%, 4 5% to 20%, 5 less Significantly greater at 95% level than corresponding value of the paired cultivar. the twelfth year has yet attained the dimensions of mature trees given by Dirr (1998), but it appears the faster-growing cultivars will be as tall when they mature or may even exceed Dirr’s figures. A few complaints have been registered about stains caused by the fruits when they fall on sidewalks. Birds like the berries, and those that fall on walkways during the summer can be swept aside. CONCLUSIONS All eight of the serviceberry cultivars being tested are perform- ing well in urban settings. Autumn Brilliance, Cumulus, ‘Robin Hill’, and Tradition have been tested more extensively, so these can be selected more confidently. ‘Cole’s Select’, ‘Prin- cess Diana’, Reflection™, and Spring Glory have been tested only at one or two locations for 6 to 10 years. The growth and health of the eight cultivars have been better in more spacious Cu 9 13.5 6.8x 4.9 4.2 Re 9 7.5 4.0 2.7 4.2 None 12 8.2 4.4 3.2 3.9 AB 12 8.2x 5.3x 3.8 4.6 AB 12 7.4 3.7y 3.0y 3.5 AB 12 9.8 5.1 4.5 2.9 Re 10 8.4 4.5 4.0x 4.1 4.9 4.7 3.5 4.3 4.9 4.2 4.8 4.7 5.0 4.7 4.7 4.9 4.3 4.5 4.6 4.9 4.9 4.4 4.5 4.9 4.6 4.3 4.7 4.4 4.9 5.0 4.2 4.7 3.6 4.4 4.3 131 settings and away from urban stresses. However, they have also performed well along downtown streets where spaces between curbs and sidewalks were only 1 m (3.3 ft) wide or less. For plantings under overhead wires, Autumn Brilliance and Tradition are less likely to interfere for at least 24 years. Cu- mulus and ‘Robin Hill’ have nearly reached a height of 8 m (26.4 ft) in 12 years on the most favorable sites. Acknowledgments. Financial support for the Municipal Tree Restora- tion Program was provided by Allegheny Energy, Asplundh Tree Expert Company, Baltimore Gas & Electric Company, Bartlett Tree Expert Company, Duquesne Light Company, First Energy Company, Hazlett Tree Service, PECO Energy Company, PPL Electric Utilities, and UGI Utilities. Foresters of the Pennsylvania Bureau of Forestry and Exten- sion Urban Foresters of Penn State University assisted with community liaison and tree measurements. LITERATURE CITED Dirr, M.A. 1998. Manual of Woody Landscape Plants. Stipes Publish- ing, Champaign, IL. 1187 pp. Gerhold, H.D. 1999. Serviceberry cultivars tested as street trees: Initial results. Journal of Arboriculture 25:189–192. ———. 2007. Crabapple cultivars tested as street trees: Third report. Journal of Arboriculture 33:176–181. Gerhold, H.D., N.L. Lacasse, and W.N. Wandell (Eds.). 2001. Land- scape Tree Factsheets. Penn State College of Agricultural Sciences, University Park, PA. 452 pp. Jacobson, A.L. 1996. North American Landscape Trees. Ten Speed Press, Berkeley, CA. Henry D. Gerhold Professor of Forest Genetics Pennsylvania State University School of Forest Resources 333 Forest Resources Building University Park, PA 16802, U.S. hdg@psu.edu Résumé. Avec le Programme municipal de restauration des arbres, des coopérateurs ont planté huit cultivars différents d’amélanchiers (Amelanchier) dans 15 communautés pour évaluer ces arbres en tant qu’arbres de rues, et ce en comparant deux espèces par communauté. Des mesures standardisées prises aux années 1, 2, 3, 6, 9 et 12 ont révélées des différences dans le diamètre du tronc, la hauteur, la largeur de la couronne ainsi que la santé du feuillage et des branches. Parmi les quatre cultivars qui ont été testés plus intensément, la différence prin- cipale est que Cumulus® et Robin Hill étaient plus grands durant les 12 années que Tradition® et Autumn Brilliance®. ‘Coles Select’, ‘Princess Diana’, Reflection™ et Spring Glory® ont aussi bien performésdesix à dix ans, mais ils ont été testés seulement à un ou deux endroits. Le taux de survie, le taux de croissance et la santéétaient supérieurs dans les sites plus spacieux, mais ces cultivars d’amélanchiers entretenus de manière appropriée peuvent aussi bien se comporter le long des rues d’un centre-ville. Tous ces huit cultivars sont appropriés pour la plan- tation sous des réseaux électriques. Zusammenfassung. Mit dem kommunalen Baumpflanzprogramm pflanzten die Kooperateure acht Felsenbirnen-Kultivare in fünfzehn Kommunen, um sie als Straßenbäume zu testen und verglichen jeweils zwei in jeder Kommune. Standardisierte Messungen in den Jahren 1, 2, 3, 6, 9 und 12 und 12 ergaben Unterschiede in Durchmesser, Höhe, Kronenbreite, Blatt- und Astgesundheit. Von vier Kultivaren, die inten- siv getestet wurden, war der Hauptunterschied, dass Cumulus® und Robin Hill im zwölften Jahr viel größer waren als Tradition® und Au- ©2008 International Society of Arboriculture
March 2008
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