Hi, I hope someone can help me. I have 42 large bags of wet sugar maple leaves collected mid November last year. I noticed that quite a few had brown pimples on the surfaces as I was raking them up. Might this be rust? I have quite a few Japanese maples and do not want to risk infecting them with rust. I had planned to make a leaf pile down at the bottom of my garden (near the raspberries). I was going to shred them and mix them with horse manure to speed up the process. Now I don't want to spread the spores by shredding them. I would like to know the best way to use these leaves. Could I make a pile, add some manure and cover with an old carpet to keep the spores from spreading. Will the rust remain viable even after a year or two. I don't want to introduce disease into my vegetable and flower and shrub beds. Should I leave the leaves in the transparent plastic bags for a few years? Should I just bury them in part of the yard and sod over the top? Thank you for any help.