![]() There are many different fungicides on the market. ![]() Contact your local independent nursery and garden center to see what they recommend in your area. Daconil fungicide controls most diseases of Japanese Maples. If you must use a fungicide, Daconil will probably be the best. Here's a good article on Japanese Maple disease problems: You can check to see if yours makes the list. There's an article here in Gardenality that lists these Japanese Maples. There are several Japanese Maples that perform well in even more sun. Morning sun is great, and will dry the morning dew off the foliage. Make sure that your Japanese Maple gets at least filtered sun or some morning sun. Lack of sun, overhead irrigation, lack of air circulation, or abnormally high amounts of rain. This fungus can be caused by a few different things. Usually the fine white gray fungus is powdery mildew. This being said it's not impossible for them to contract a fungus or disease. I haven't experienced a fungus on any of them. I have 65 plus Japanese Maples in my landscape. This way Brooks will recognize your your appreciation of his answer quickly. when you want to comment on and answer you can use the 'Comment About This Answer' box below the answer instead of using the 'Post An Answer to this Question' box. ![]() Use Brooks recommendations and your trees should be fine. If dry deep water at least once a week to make sure the whole root ball is being kept moist. It is important to dig down 6 to 8 inches and make sure the soil feels cool and moist, not wet. We sometimes have a tendency to over water newly planted maples. The leaf drop can also be attributed to too much water as Brooks noted. If the leaves are dropping make sure they are picked up keeping any fungus from spreading to other plants. Leaves were never wet, but high humidity plus no circulation will produce the same results as getting the foliage wet with irrigation sprinkling. What Brooks is noting proved the reasons for my mildew problem. This area was protected from wind which evidently had very poor air circulation. Only once I have experienced mildew on a Japanese maple, Tamukeyama, and it was due to moving it in an area that was poorly lit, very moist, humid corner of a garden. I also have many japanese maples, no where near the numbers Brooks has. Alexander-Brent is correct in assuming you have powdery mildew on your maple.
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