Apple tree's spotted leaves in Maryland
I have apple trees and have lost about 97% of last year's crop and 90% or previous year's crops due to these spots. I have attached a picture of some leaves where it is starting again this year. I think this is apple scab and I have already sprayed the trees 20 days ago with captan. Is this apple scab or something else? Can you suggest any treatments to control/stop/prevent what is happening this season? I have removed all the contaminated leaves and fruit from last year.
Based on your photos the apple tree leaves looks like they have been subject to frogeye leaf spot, a fungal disease. Be sure to practice good sanitation.
It is a challenge to grow apple trees as they can be prone to disease and pests and usually require a spray schedule for control. One spray is not enough to prevent problems. In general sprays are required throughout the season depending upon the problem. Take a look at our website for common problems and the spray schedule for Va Tech for more information https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/456/456-018/section3-home-fruit.pdf