Apple Tree Disease
I have two Granny Smith apple trees in my back yard. They seem to have developed a leaf disease. Online searching has suggested a couple of possibilities but I am hoping you can give me the real answer for MoCo and what, if anything, I can do. The trees are fairly close together, I'm afraid. Thank you!
Montgomery County Maryland
In general apples are susceptible to insect and disease issues and eventually require a spray schedule for control. Left and middle photos looks like scab. Right photo looks like frog eye leaf spot. You may see some defoliation. Rake all fallen leaves and dispose of in the trash. You will have to adhere to a spray schedule next spring.
See our website on common diseases and the spray schedule from Va Tech