Madrone tree needs help - Ask Extension
Hi, I have a madrone tree that is needing some help. I thought it was a bug (still may be) but I notice that the leaves are discolored as well.
Knowledgebase
Madrone tree needs help #827602
Asked April 28, 2023, 2:31 PM EDT
Hi, I have a madrone tree that is needing some help. I thought it was a bug (still may be) but I notice that the leaves are discolored as well.
Multnomah County Oregon
Expert Response
Thank you for your question, Sam. Your tree appears to be infected with one or more of the fungi described in this diagnostic manual: https://pnwhandbooks.org/plantdisease/host-disease/madrone-arbutus-menziesii-leaf-spots-blights
Other than removing and destroying infected leaves, there are no treatments.
It also appears to be infested with root weevils, causing the notching. https://pnwhandbooks.org/insect/hort/landscape/hosts-pests-landscape-plants/madrone-arbutus-root-weevil
This describes their life cycle, and monitoring recommendations: https://pnwhandbooks.org/insect/hort/landscape/common/landscape-root-weevil
And this chart has chemical controls that can be used: https://pnwhandbooks.org/insect/hort/landscape/chemical-control-landscape
You may be having these problems in some part because the tree is stressed, since this species is notoriously fussy about its environment, described here: https://extension.oregonstate.edu/news/native-madrones-are-special-northwest
I hope these resources are helpful. Good luck!
Other than removing and destroying infected leaves, there are no treatments.
It also appears to be infested with root weevils, causing the notching. https://pnwhandbooks.org/insect/hort/landscape/hosts-pests-landscape-plants/madrone-arbutus-root-weevil
This describes their life cycle, and monitoring recommendations: https://pnwhandbooks.org/insect/hort/landscape/common/landscape-root-weevil
And this chart has chemical controls that can be used: https://pnwhandbooks.org/insect/hort/landscape/chemical-control-landscape
You may be having these problems in some part because the tree is stressed, since this species is notoriously fussy about its environment, described here: https://extension.oregonstate.edu/news/native-madrones-are-special-northwest
I hope these resources are helpful. Good luck!
