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.
Frederick County Maryland
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