Knowledgebase
verticillium wilt #484134
Asked September 11, 2018, 10:04 AM EDT
I had a maple tree I believed died from verticillium wilt. It was a 7 year old autumn blaze maple.
last year the leaves turned color in early august. Then this spring it flowerd and then just dried up
and never came back. I removed the tree and just would like to plant something where it was for any
shade. what would you recommend?
Arapahoe County Colorado
Expert Response
It's too bad there is not a confirmed diagnosis of Verticillium wilt that killed the maple. According to research at Michigan State University, red and sugar maples are more resistant than silver or Norway maples. Autumn Blaze is a hybrid cross between the silver maple and red maple.
Verticillium is a soil borne fungus that infects roots then settles into the vascular system of the tree blocking water movement. Because Verticillium persists in the soil for years, you will need to replace it with a tree that is Verticillium-resistant. Here is a short list of trees that are resistant or immune to Verticillium wilt.
Here is more information from CSU:
http://planttalk.colostate.edu/topics/insects-diseases/1400-6-verticillium-wilt-catalpa-trees/
You might consider sending a soil sample to the CSU Soil Testing Lab asking them to test specifically for Verticillium. If the diagnosis is negative, it may give you more options for a replacement tree.
http://www.soiltestinglab.colostate.edu/
Here is the Front Range Recommended Tree List.
https://extension.colostate.edu/docs/pubs/garden/treereclist.pdf
Finally, red and silver maples (like Autumn Blaze) are highly susceptible to iron chlorosis if your soil is clay and high pH. Many trees succumb to this as well. Below are three photos of maple tree leaves indicating different problems: Verticillium wilt, iron chlorosis and drought damage.
http://planttalk.colostate.edu/topics/weeds-cultural-problems/2121-iron-chlorosis-trees/