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air pollution American elm Annual Meeting application Arbor Day Arboretum Arborists areas associated bark Benomyl borer Calif Canada canker chemical cost cultivars damage decay defoliation dieback discolored Dutch elm disease effective environmental evaluation fertilizer foliage Forest Service fungicides fungus green growing growth herbicides horticulture Illinois injection injury International Society Journal of Arboriculture landscape leaf maintenance Maneb municipal National Arborists Neely Norway maple nursery nutrients Ohio ordinances organization P.O. Box Park pathogens pest pesticide Phytopathology pine plants problems pruning Quebec red maple reduce resistance root salt seedlings Shade Tree Shigo Society of Arboriculture soil species spray STEMIX street tree stress sugar maple temperature tion tissues treatment Tree Expert Tree Service Tree Surgery tree trimming trunk U.S. Forest Service University urban forestry urban trees USDA vegetation wood wounds