Trunk injection requires specialized equipment and expertise and should be left to professionals. If not done right, the tree can be damaged.

To help your tree, be sure your tree is getting adequate (and not too much) water during the growing season. Wintering watering will also help the tree be in better shape to combat disease. 

Here is some additional information:

Watering Mature Shade Trees (GN 657)

Fall and Winter Watering (Fact Sheet 7.211)

If you have specific questions about caring for your tree or anthracnose, please contact the local master gardener desk: <personal data hidden> or<personal data hidden>.

I had a mature locust tree injected recently. The arborist bored 10 holes around the trunk with a hardware store drill and used a bike pump to inject the medicine from a syringe-like vessel;. Nothing specialized there. $350 and 30 minutes later she was done. I was hopeful that your service could recommend a fungicide, dose, and apparatus for a homeowner to care for a mature sycamore instead of deferring the work to a high dollar professional.    

I had a mature locust tree injected recently. The arborist bored 10 holes around the trunk with a hardware store drill and used a bike pump to inject the medicine from a syringe-like vessel;. Nothing specialized there. $350 and 30 minutes later she was done. I was hopeful that your service could recommend a fungicide, dose, and apparatus for a homeowner to care for a mature sycamore instead of deferring the work to a high dollar professional.

Watering is not the issue in this case.