Hello,

Based on your leaf images, I identified the leaves from a Sweet Cherry (Prunus avium) Tree. The browning and spotting of your Sweet Cherry Tree leaves could be due to Cherry Leaf Spot, a disease caused by the fungus Blumeriella jaapii. More information at these links:

Cherry Disease - Cherry Leaf Spot (psu.edu)

Cherry Disease - Cherry Leaf Spot (psu.edu)

This disease is characterized by:

Tiny, red to purple, circular spots on the upper sides of leaves.

Spots enlarge to 1/8 to 1/4 inch in diameter and turn red-brown to brown.

Infected leaves turn yellow and fall off.

The fungus overwinters in diseased leaves on the ground and spreads through spores during wet periods. More information at these links:

Cherry Disease - Cherry Leaf Spot (psu.edu)

Cherry Disease - Cherry Leaf Spot (psu.edu)

Here’s what you can do to manage and treat Cherry Leaf Spot:

Sanitation: Rake up and compost fallen cherry leaves to reduce the spore numbers. More information at this link:

Cherry leaf spot | UMN Extension

Mowing: Rotary mow the orchard after leaves drop in fall to hasten leaf decay. More information at this link:

Cherry Disease - Cherry Leaf Spot (psu.edu)

Fungicide: Apply fungicide starting at the bract leaf stage during bloom time and continuing throughout the season as needed. Two postharvest fungicide sprays are recommended to prevent premature defoliation. More information at this link:

Cherry Disease - Cherry Leaf Spot (psu.edu)

Keeping the trees holding onto their leaves through September is important to avoid susceptibility to winter damage. More information at this link:

Cherry Disease - Cherry Leaf Spot (psu.edu) 

If you’re unsure about the treatment or the health of your trees and want to get a precise diagnosis of the problem, consider consulting a local arborist or the MSU Plant and Pest Diagnostic lab extension service for personalized advice before you do the above treatment.

YOU HAVE TWO OPTIONS:

OPTION 1:

For a confirmed and precise identification of the problem, I recommend you send all your images by e-mail to the MSU Plant & Pest Diagnostics Lab. The experts there can also provide you with the best treatment options. Their email is <personal data hidden>. Please include your name. The lab will let you know if they need a sample sent. FYI, the lab may also ask for additional images.

Their website is at this link:

Plant & Pest Diagnostics (msu.edu)

Their Contact Information is at this link:

Contact Us - Plant & Pest Diagnostics (msu.edu)

This link will explain the details of submitting a sample to MSU Plant & Pest Diagnostics Lab:

Submit Samples - Plant & Pest Diagnostics (msu.edu)

OPTION 2:

You can consult a local certified arborist for a more detailed onsite assessment and personalized advice. To find a certified arborist in your Zip Code, go to this link:

Find an Arborist (treesaregood.org)

I hope this helps!