Q.Follow Up Question About Winter Damaged Japanese Maple.
First of all thank you to the person who took the trouble to answer my question. You suggested that the problem was a fungus growing on the trunk and branches, but I could not find which kind of fungus in the links you sent, or the kind of fungicide to use to clear up the problem or prevent it progressing. I am a big fan of Neem Oil and use it extensively in the garden, but unfortunately it is not suitable for Japanese Maple trees, which is a pity since it takes care of most things. Could you tell me please, if left untreated how much harm will it do? It has certainly spoilt the look of the tree since it is covering the lovely red bark, but the tree appears to be thriving otherwise and is bursting out all over with its spectacular red leaves. Thanks again.
Certified GKH Gardening Expert
Fungicide will be a broad term that describes many different methods of fungus control. Anything with copper, such as copper sulfate, will be appropriate. I would consider Neem oil to be better as a pesticide than as a fungicide. It has very little effect on most fungi.
At this point, identification will be absolutely impossible. It is, either, a crust fungus, or bracket fungus. There are thousands, unfortunately.
Most crust fungi are harmless. Most bracket fungi will take a tree out within years.
To give the tree the best chance, treat with a copper based fungicide.
Thank you again BushDoctor, I will try that. I just want to beg to differ about the Neem Oil. For the benefit of others, we have found it superb protection against black spot on roses, and powdery mildew on clematis and others, but it is harmful to some plants including Japanese Maple, so it is best to read up which plants to avoid. Wonderful stuff! Thanks again :)
