Q. You mentioned to drill holes in the trunk of the Cypress and pour a solution into the holes to encourage decay. Can you tell me again what that solution was? I can't read my own writing!
A. I would use diluted Roundup if the tree is still standing and you want to kill it. Use the most concentrated form allowed on label. Either buy it in the diluted form or dilute a concentrated form but do not use it full strength unless it is already diluted.
Drill the holes as close to the ground as you can and at a downward angle. Use something like a syringe or other disposable item to force dilute Roundup down the holes that are freshly drilled. Fill the holes every hour three times to get plenty of chemical in the tree if you want to kill it.Make sure you wear unlined gloves during the application to protect your hands.
There is a product that you can buy which you can apply to the stump after the tree has been cut down. Once the tree has been cut down, drill holes in the stump vertically and fill the holes with this product.The product comes under several names such as Stump Remover, Stump out, etc. Follow the directions on the label. Hope this helps.