mark under leaves of apple tree
I have pink/white marks under the leaves of my apple tree. Please help me understand what this is on my apple tree. It has what I think is rust but also this pink/white almost fluffy marks underneath. Are they eggs or disease? I've looked in books but to no avail.
That looks like powdery mildew to me. For more information on powdery mildew and other apple tree diseases, please visit the following link: