For a 18" DBH you would use 80ml of Tre-age with equal amount of water. Around here its about $500 a liter and you save if you buy a case.
Mark of Excellence
Landscape & Tree Care Specialist
Certified Arborist # IL 452
Landscape Design Degree
Full time County Forestry- 26 years
Part time Firemen-22 years
Part time Landscape-31 years
79 Years, no wonder it hurts!