Apple Leaf spots
Dear lovers of trees: I coppiced an old apple tree last fall and am learning what I can about regeneration. I had hoped that by restoring the juvenility of this undoubtedly 'heritage' species I could keep off the bugs and problems as it matured. I know that most people would advise to just buy a grafted "newer model" but that is not the story at this point. So, what does this leaf look like to you and what could be done to fight the problem of spots? I have already used Neem oil and BT spray as a first step, without lots of success. Thank you for any answers!
Licking County Ohio
Hello and thank you for your question. It appears that you might be dealing with frogeye leaf spot on your apple tree. Here is a link to an OSU Extension FactSheet that I hope that you find informative: https://ohioline.osu.edu/factsheet/plpath-fru-07
While the bt is an effective caterpillar control, this insecticide will have no protection against the fungus that you are currently experiencing.
While the FactSheet does a nice job of talking about the pathogen, it does reference additional resources for control measures. To make this easier, I have provided those links in the email rather than you having to go back and forth.
Midwest Fruit Pest Management Guide
Controlling Diseases in Home Fruit Plantings
Please let me know if you have additional questions. I would also suggest that you reach out to your local Extension office in Licking County. Their information can be found online at www.licking.osu.edu
Have a great day and stay safe. Amy