RT Journal Article SR Electronic T1 Exploring Alternatives to Tree Injection JF Arboriculture & Urban Forestry (AUF) FD International Society of Arboriculture SP 217 OP 226 DO 10.48044/jauf.1991.052 VO 17 IS 8 A1 Thomas O. Perry A1 Frank S. Santamour A1 R. Jay Stipes A1 Theodore Shear A1 Alex L. Shigo YR 1991 UL http://auf.isa-arbor.com/content/17/8/217.abstract AB The history of injection practices in medicine and arboriculture is reviewed and the problems associated with these practices are discussed. Columns of occluded (compartmentalized) xylem and killed bark are typically associated with wounds caused by injection. These columns extend both up and down the trunk and may extend out into the roots. Forty percent or more of the transport system can be blocked. Typical wound responses are illustrated. In most cases, there are other methods for inducing the uptake of fertilizers, biocides, and growth regulators by trees. These alternatives need to be promoted and improved and new technologies need to be developed.