After several years of use
throughout the United States in the 1980s, problems
associated with trunk injection begin to appear. Cracks
in the bark and cambium, weeping from injection
holes, and internal wood discoloration due to the
alcohol carriers led to disenchanted utility arborists
and their customers. A decline in use of TGRs
followed. Uniconazole was even removed from the
tree care market. However, in spite of these problems,
interest among utility arborists continued in a chemical
tool to reduce trimming frequency and the amount of
wood waste removed from trees.