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aerial lifts Alex Shigo annual application Arbor Day Arboriculture ArborMaster bark Bartlett borer branches bronze birch borer certification Certified Arborist chain saw Champaign Chapter City climber Committee conference conifers damage David disease e-mail emerald ash borer equipment exam experience Forest growth Hispanic hitch Husqvarna injury insects International Society ISA Certified Arborist ISA members ISA's ITCC John Journal of Arboriculture knot landscape leaf Limit maple Mark Chisholm membership Michael municipal nitrogen organization palms percent pest phloem Plant Health practices pruning rigging root rope safety says shrubs Society of Arboriculture soil species stem STIHL Sudden Oak Death tion tissue Tree Care Industry Tree Climbing Tree Expert TREE Fund Tree Service Tree Worker trunk urban forestry utility Vermeer wood www.isa-arbor.com xylem