International Society of Arboriculture
International Society of Arboriculture, nke a maara dị ka ISA, bụ òtù mba ụwa na-enweghị uru nke nwere isi na Atlanta, Georgia, United States. ISA na-eje ozi na ụlọ ọrụ nlekọta osisi dị ka òtù a na-akwụ ụgwọ na nzukọ asambodo nke na-akwalite ọrụ ọkachamara nke arboriculture. ISA na-elekwasị anya n'inye ohere nyocha, teknụzụ, na agụmakwụkwọ maka ndị ọkachamara na-elekọta osisi iji zụlite nka ha. ISA na-arụkwa ọrụ iji kụziere ọha na eze banyere uru nke osisi na mkpa maka nlekọta osisi kwesịrị ekwesị.

N'ụwa niile, ISA nwere ihe karịrị ndị otu 22,000 na ndị ọkachamara 31,000 ISA-certified tree care nwere isi 59, òtù ndị mmekọ, na ndị ọkachamara na North America, Asia, Oceania, Europe, na South America.

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