Soil testing and peach fungus - Ask Extension
Hello,
I am wonder if the extension service does soil testing or if I need to contact an outside lab to get that done.
I also have a peach tree i...
Knowledgebase
Soil testing and peach fungus #948156
Asked November 05, 2026, 5:08 PM EST
Hello,
I am wonder if the extension service does soil testing or if I need to contact an outside lab to get that done.
I also have a peach tree in my yard that gets a leaf fungus each spring on the first set of leaves. I heard that I need to treat this in the fall to prevent it in the spring. Do you have more info on this and what I should be doing?
Clackamas County Oregon
Expert Response
Hi, Thanks for writing in!
Below is a list of soil testing for you to consider. I will share your question with a Clackamas County Master Gardener to help with your peach tree.
Warmly,
Below is a list of soil testing for you to consider. I will share your question with a Clackamas County Master Gardener to help with your peach tree.
Soil Testing Laboratories for Gardens, Lawns, and Landscapes
This is a list of soil testing laboratories in the western U.S. that are known to offer garden soil testing packages and provide recommendations. Carefully follow your selected lab’s sampling and shipping guidelines.
- Garden centers, hardware stores, and online stores also sell soil test kits. Choose a kit that has you collect a soil sample and mail it to a lab for testing. The accuracy will be better than that of a colorimetric test kit (which relies on your perception of color changes) or digital probes.
Please note that reference to specific companies and associated commercial products does not mean that the OSU Extension service endorses these products or services or that we intend to discriminate against products and services not mentioned.
Warmly,
Thank you for your questions. In addition to those labs listed by Anna, both OSU Soil Health Lab (https://cropandsoil.oregonstate.edu/shl/testing-services/soil-testing) and A & L Western Agricultural Labs (https://allabswest.wordpress.com/soil-analysis/) do this testing. Testing for issues in addition to soil pH and soil nutrients can get very expensive, so be clear about what you need.
As for peach leaf fungus, there are 18 diseases that infect peach trees, but the most common fungal infection is "peach leaf fungus", described here: https://pnwhandbooks.org/plantdisease/host-disease/peach-prunus-persica-leaf-curl
Note that only those marked "H" are available to homeowners. Those marked "O" are organic, and may or may not be available generally. It is probably too late to apply the fall "dose", but you should be ready for the spring one. Good luck!
As for peach leaf fungus, there are 18 diseases that infect peach trees, but the most common fungal infection is "peach leaf fungus", described here: https://pnwhandbooks.org/plantdisease/host-disease/peach-prunus-persica-leaf-curl
Note that only those marked "H" are available to homeowners. Those marked "O" are organic, and may or may not be available generally. It is probably too late to apply the fall "dose", but you should be ready for the spring one. Good luck!
