Lots of googling around, but I couldn't find anyone saying that lack of sunlight inhibits sucker growth. The chemical treatment out there, it seems only temporary per application.
There is something called 'nuclear grade' duct tape, if you google it. Highly durable for both interior and exterior. They actually say that it is recommended for use in nuclear reactor facilities, but I don't think it has anything to do with the brain in the government who suggested that you...
"Look terrible" is only relative by degrees. I go by a place everyday where a row of conifers has been topped, and over over each stub is an upside down plastic bucket. The person who did it though, doesn't have such bad sense.....each one is a blue bucket....sky blue! If they were of varying...
It might be a catch 22. I believe that the liability of using tar is that it completely traps in moisture which draws borers, etc.. Paul might have some good ideas, it occurs.
Wax is one end grain sealer, just dripping a candle over the end. A thick waterproof glue is sometimes used as well. For a different application, though.
Tape seems weak for exterior, likely dry out quickly in the sun. My dad use to raise fruit trees and he would always use roofing cement tar to seal the cuts. There is some controversy about it currently, that the practice attracts bugs. I have heard about using a torch to burn and seal cuts...
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