Insects on elm leaves - Ask Extension
Does anyone know if insects on elm trees leave are contagious and should I have tree cut down to stop the spread?
It looks like insects are suckin...
Knowledgebase
Insects on elm leaves #806924
Asked August 18, 2022, 4:56 PM EDT
Does anyone know if insects on elm trees leave are contagious and should I have tree cut down to stop the spread?
It looks like insects are sucking juice from leaves and maybe tree will drop dead?
Ingham County Michigan
Expert Response
Hi Berta,
Thank you for using Ask Extension.
Those are actually galls, or insect larvae that are actively feeding on the leaves. Despite the look of them, they will cause no harm to the trees. Below is a link to an article that describes the fascinating world of galls, and the insects that create them:
https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls
This link names the gall you have as the "elm finger gall":
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/elm/leavesprojections.html
If you have any further questions, please do not hesitate to ask.
Thank you,
Julie
Thank you for using Ask Extension.
Those are actually galls, or insect larvae that are actively feeding on the leaves. Despite the look of them, they will cause no harm to the trees. Below is a link to an article that describes the fascinating world of galls, and the insects that create them:
https://extension.umn.edu/yard-and-garden-insects/insect-and-mite-galls
This link names the gall you have as the "elm finger gall":
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/elm/leavesprojections.html
If you have any further questions, please do not hesitate to ask.
Thank you,
Julie
