birch tree leaves spotted and turning yellow - Ask Extension
why are the leaves on my birch tree spotted and turning yellow? there are black spots all over the leaves and then they turn yellow and fall off. al...
Knowledgebase
birch tree leaves spotted and turning yellow #879963
Asked August 02, 2024, 5:44 PM EDT
why are the leaves on my birch tree spotted and turning yellow? there are black spots all over the leaves and then they turn yellow and fall off. also the bark is pealing, allthough i think that might be normal???
Muskegon County Michigan
Expert Response
Hi James,
This looks like septoria leaf spot of birch leaves. It is a fungal infection of the leaves that presents symptoms in wet, humid weather, which has been common in Michigan this summer.
https://www.ontario.ca/page/septoria-leaf-spot-birch
Best to pick up and dispose of the fallen leaves in the trash, as they will produce spores that will fuel an infection in subsequent years.
Use of fungicides on the leaves next spring when they are emerging can help prevent infection. Use a copper based fungicide or one with active ingredient chlorothalonil. Spray leaves when they are emerging, and possibly once more when the leaves are fully emerged.
Always read and follow label directions when using a fungicide.
Thank you,
-Julie
This looks like septoria leaf spot of birch leaves. It is a fungal infection of the leaves that presents symptoms in wet, humid weather, which has been common in Michigan this summer.
https://www.ontario.ca/page/septoria-leaf-spot-birch
Best to pick up and dispose of the fallen leaves in the trash, as they will produce spores that will fuel an infection in subsequent years.
Use of fungicides on the leaves next spring when they are emerging can help prevent infection. Use a copper based fungicide or one with active ingredient chlorothalonil. Spray leaves when they are emerging, and possibly once more when the leaves are fully emerged.
Always read and follow label directions when using a fungicide.
Thank you,
-Julie
