quaking aspen leaf - Ask Extension
A stand of young quaking aspen have rapidly developed a problem. The leaves are turning brown and curling up. They appear black when wet but dark rust...
Knowledgebase
quaking aspen leaf #875985
Asked July 05, 2024, 11:19 AM EDT
A stand of young quaking aspen have rapidly developed a problem. The leaves are turning brown and curling up. They appear black when wet but dark rust brown when dried out. There are spots across the leaf with the edge of the leaf most affected. I don't readily see sign of insects but rather that of a fungus. I've not been able to clearly identify the problem online and would like some advice before spraying.
My yard has about five acres of aspen. The affected trees are three to ten feet tall residing on the periphery of the southeast corner of the larger trees. Thank you
Washington County Minnesota
Expert Response
Aspen are very susceptible to too much water. Is the location wetter than the rest of your property? Has there been standing water?
The plant disease clinic can identify the disease. There is a fee.
https://pdc.umn.edu/
These references hopefully are helpful in figuring out what is affecting your trees. There is also a lot of information about managing common diseases.
https://extension.umn.edu/plant-diseases/hypoxylon-canker
https://www.fs.usda.gov/detail/r10/forest-grasslandhealth/?cid=fsbdev2_038332
https://www.uidaho.edu/-/media/uidaho-responsive/files/extension/topic/nursery/diseases/aspen-leaf-spot.pdf?la=en&rev=bf0472f0b4064abb968d7f564b74277d
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprd3833855.pdf
https://csfs.colostate.edu/forest-management/common-forest-insects-diseases/common-insects-diseases-of-aspen/
https://extension.usu.edu/planthealth/research/pests-of-ornamental-aspen
The plant disease clinic can identify the disease. There is a fee.
https://pdc.umn.edu/
These references hopefully are helpful in figuring out what is affecting your trees. There is also a lot of information about managing common diseases.
https://extension.umn.edu/plant-diseases/hypoxylon-canker
https://www.fs.usda.gov/detail/r10/forest-grasslandhealth/?cid=fsbdev2_038332
https://www.uidaho.edu/-/media/uidaho-responsive/files/extension/topic/nursery/diseases/aspen-leaf-spot.pdf?la=en&rev=bf0472f0b4064abb968d7f564b74277d
https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprd3833855.pdf
https://csfs.colostate.edu/forest-management/common-forest-insects-diseases/common-insects-diseases-of-aspen/
https://extension.usu.edu/planthealth/research/pests-of-ornamental-aspen
