Originally Posted by fire126
We have been injecting Trees with Tre-age using Arborjet system. The insecticide is exspensive, but only treating some trees. About 275. Tre-age has had great results and is protecting the tree for 2-3 years.
That tre-age is expensive, $600 for a liter. How much of that stuff would you use for a preventative treatment with 18" DBH ash ?