Green ash tree

Asked September 15, 2020, 11:42 AM EDT

We have a large green ash that definitely needs pruning. One abortionist said it has ash pore but the other said just prune it. We don't know if we should just prune it at a cost of $1000 or remove it for $3200. If a tree does have ash pore, can it be saved at least for another few years?

Denver County Colorado

1 Response

We have to defer to your arborists about the condition of your Ash because they examined it and are in the best position make a recommendation about whether it is worth it to prune/treat it or whether the condition of the tree warrants removal.

Several different kinds of wood borers attack Ash. Some, like the Lilac/Ash borer, have been in the metro area for a long time and are regularly treated and controlled. You can read about the different Ash boring insects here: https://extension.colostate.edu/topic-areas/insects/recognizing-wood-boring-insects-of-ash-trees-in-...

One Ash borer insect is new to the metro area and it is very destructive. It is called the Emerald Ash Borer. It has not been detected in Denver proper yet but it has been detected in Boulder County and it is expected to get to Denver eventually. For that reason, all homeowners with Ash trees are advised to formulate a plan about whether or not to protect their Ash trees which will necessitate repeated pesticide treatments for the life of the trees. Your tree may or may not be worth it depending on it's age, condition, and site.

Anticipating the arrival of the Emerald Ash Borer, Denver Forestry has already started treating Ash trees in the public right-of way. Homeowners are responsible for treating Ash trees on their property. To help homeowners evaluate their options, the city has a website called Be A Smart Ash with lots of information and resources. It can be found here: https://beasmartash.org/