Multi Grafted Apple Tree – disease?
We have a small 3 year old apple tree we purchased from a nursery. Last year it produced maybe 3 apples total, which more than we were expecting. This year we have many more on various branch types. However, some of the leaves are turning colors and/or getting spots and dying. Can you please help me figure out what is wrong and what I can do to help it? I've only been gardening a couple of years and I don't know a lot about these things. I would love to have this tree for years to come. Please help. The types of grafted branches are: Melrose, Yellow Delicious, Honeycrisp, and Gravenstein. All are semi-dwarf and we live in Oregon if that makes a difference. Thank you for your time. -Kara
This could be necrotic leaf blotch.
The link below discusses this issue.
These links discuss the common issues and disease found with Apple Trees.
Further inspection of the leaves and plants will help you.