Of all the available treatments, root injection with Arbotect 20-S is showing the most promise, but is not a cure and would still need to be done yearly to prolong the life of the tree. It's a process where you drill into the root flare of the tree and set up tubing around the circumference and pump the chemical into the roots. Arbotect 20-s is available for consumer purchase in CT. It's $550.00 per gallon.