Oak disease - Ask Extension
An oak tree in my neighborhood has pale green areas on the leaves. Can you tell me the disease or environmental issue?
Thanks very much.
Knowledgebase
Oak disease #871605
Asked June 04, 2024, 7:27 PM EDT
An oak tree in my neighborhood has pale green areas on the leaves. Can you tell me the disease or environmental issue?
Thanks very much.
Larimer County Colorado
Expert Response
Hi Alice,
This could be the start of oak leaf blister, which is a common fungus that the group of white oaks tend to get. Fortunately, it just looks bad, but rarely causes harm to the tree.
Unfortunately, it's too late to do anything, as preventative fungicides are the only option and must be sprayed during budbreak.
Here's more information from Utah State: https://extension.usu.edu/planthealth/ipm/notes_orn/list-treeshrubs/oak-leaf-blister
This fall, rake up the leaves and throw them in the trash. This disease is most common during wet springs, which we didn't really have, but perhaps the temperatures and timing were "just right" this year.
This could be the start of oak leaf blister, which is a common fungus that the group of white oaks tend to get. Fortunately, it just looks bad, but rarely causes harm to the tree.
Unfortunately, it's too late to do anything, as preventative fungicides are the only option and must be sprayed during budbreak.
Here's more information from Utah State: https://extension.usu.edu/planthealth/ipm/notes_orn/list-treeshrubs/oak-leaf-blister
This fall, rake up the leaves and throw them in the trash. This disease is most common during wet springs, which we didn't really have, but perhaps the temperatures and timing were "just right" this year.
