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aesthetics aphids Arboriculture arborist areas assessment bark biological controls chemical client climate company’s contract cost create cultural damage determine develop diagnosis disease effective employees environmental stress evaluation example factors growing season growth hardiness zone Horticultural oil identify individual inﬂuence injury insects installation inventory key plants landscape maintenance landscape management landscape map landscape plants leaf management strategies marketing plan marketing theme ment mites mulching needs organisms pathogens pest organism pest problems pesticide pesticide applications PHC approach PHC marketing PHC practitioner PHC program PHC services pheromones Plant Health plant identification plant reactions potential professional pruning records reﬂected require result root sample selection shrubs soil soil pH soil texture species sprays stress problems sumer symptoms tactics target market techniques temperature threshold tion tissue tool treatment tree care consumers tree health trees and shrubs twigs urban woody plants