How to kill an old tree with drugs?

Old trees can be killed with actinomycetes ketone.

Cyclozinone is a systemic selective herbicide, which has low toxicity to people and animals and is safe to use. It has strong killing effect on most woody plants.

It should be reminded that trees are friends of human beings, and protecting trees means protecting ourselves! Therefore, it is unnecessary not to kill a big tree, otherwise, it will not only destroy the balance of nature, but also violate the law.