There are a few Japanese maple diseases and several insect problems with Japanese maples that you should be aware of to give your tree the care it needs. Some branches are dying and fall off during heavy winds. The good news is that the trees will recover, and with any luck from Mother Nature, will leaf out in all their glory next year. Hi Siv Low, I think your trees, along with most other people's trees in the U.S., suffered stress with the unusual spring (with a late frost) we had this year. Leaves higher up and near the tops are slowly shriveling up and dying. Just within the last week or two I have noticed that the leaves are uniformily turning scarlet color, however are not dried out or spotted in any way. Hi Mike, I suspect, based on your location, that your maple was anothr casualty of this year's late frost. We live in the Pacific Northwest and have a large (approx 30 year old) well established Japanese Red Maple tree (not sure of the exact species)that has been suffering leaf die off in summer for the last three years. Older maples tend to leaf out on the outermost part of the branches, while the inner parts of the branches have fewer leaves and small branches. Once a tree is infected, the disease survive the winter in infected branches and then spread when the wind carries its spores to surrounding trees. I am devestated! is the soil type the same in their different locations? It doesn't seem to be any particular size of leaf or location. In some cases—especially with house plants—propagators actually select infected plants since consumers like the way that the infection looks. Lichen gets everything it needs to thrive from the air rather than its host surface. Tar spot will not kill your trees, but it's unsightly and can cause them to drop their leaves before the fall season. Asian longhorned beetleA new and potentially serious threat to some of North America’s most beautiful and popular trees is the Asian Longhorned Beetle (Anoplophora glabripennis). Leafscorch occurs around the perimeter of the leaf. I have a sugar maple that is 60 feet tall. However, it inflicts much more extensive damage because it affects both the leaves and the branches. It's caused by unfavorably dry weather conditions. In the long term would bracing the trunks help to prevent the splitting? If the spots make an appearance next year, you could spray the leaves with a fungicide; contact your county Cooperative Extension office (in the US) to find out what fungicides are allowed in your area. I'm not sure exactly what may be causing the lesions you speak of. This disease can be managed by removing all debris and dead leaves from around the trees before winter, as the fungus that causes it lives in the debris. It is too bad if they're causing trouble for you, since they're great shade trees. It looks wilted today and we just received 5-7 inches of rain in the past 72 hours. Is the tree dying? Your Life has called and left you a message: get one, and spend less time surfing the Internet. Hi, I've been planting sugar maples (small 18-24 inch saplings) on my property in Michigan for 5 years. Leaves that are spotty and are turning brown along the veins of the leaves may signal that the tree has anthracnose. I water the trees as much as my neighbors.But the trees are always greener on the other side :( I want to help my tree grow. I don't think your tree is dying- it just needs a little extra care. The female lays her eggs on the leaves by burrowing into the leaf (this can result in brown scars on it). My tree looks like it's starting to have some problems. Also, don't use concrete to fill a hole. A database that provides information on more than 200 native tree and shrub species, and on almost 300 insects and 200 diseases found in Canada's forests. Any ideas as to what's happening and how I can fix it? Since 1980, the gypsy moth larvae have defoliated close to a million or more forested acres each year. So now the cars and deck are covered with sticky sap. Charlotte Gerber (author) from upstate New York on August 01, 2010: Hi Brenda, It sounds like you have carpenter ants. Dieback generally around the crown; external signs appear long after the tree has been infected, Try to prevent the roots from getting damaged or wounded; some trees recover for no apparent reason, Ten to brown spots with a purple or red center. Is there something I can fill this hole with like a foam insulation product? Powdery mildew doesn't often cause lasting harm to the tree that it's on because it just sits on the top of the leaf (as opposed to getting inside the roots or eating holes in the leaves). I was told it could be Anthracnose, but uncertain how to treat it or if it is treatable this late in the season? Alternatively, you could contact a beekeeper who may be interested in the bees, then cut down the tree (though they would be "wild" bees). The leaves are very small but the tree is quite dense, the leaves have curled from the tips and the tree looks like its dying. Charlotte Gerber (author) from upstate New York on June 11, 2010: Hi MelissaJ, The damaged root could be the source of the problem with the one side of the tree. Hi Annie Papas, I would definitely say that you have a fungal infection, however, I'm not sure how to tell you to treat it, since I'm only aware of US laws regarding fungicides. I wouldn't cut the tree down with the bees in it though- that's just asking for trouble! To look at it from any angle other than while standing under the canopy, the tree looks full & healthy. The scales grow to adulthood on the leaves and mate in August or September before the females return to the twigs to spend the winter. Question: A big piece of bark fell off my large silver maple tree. Check out my slideshow at the beginning of my article- slide #7 is a photo of this type of gall. Dead major limbs could identify borer infestations.". One of them has been trimmed in the past, while the other has pretty much grown on its' own, it is huge. In my own experience, this has helped me to eliminate a variety of landscape pests including aphids. Question: Why aren't my Purple Maples purple? silver maple leasions in bark / separating 8 or 10 years old 30ft tall - we live in texas near austin. Alternatively, the Japanese maple is susceptible to two other problems that cause similar leaf problems: aphids (visible on the underside of leaves), which leave a sticky residue - I use Bayer Advanced Tree and Shrub, as it kills sucking insects and fertilizes at the same time. There are two things that come to mind when I hear "white fungus" - powdery mildew or heart rot. Maple trees can leaf out more than once during a growing season if they are stressed, so hang in there. While I hate to sound like a broken record lately, I've been using the Bayer Advanced Tree and Shrub to treat my maples and other plants that were hit with the late frost. Please help as I do not want to lose these wonderful trees. Note, however, that … A couple years ago we planted 2 October Glory Maples here in TN. Tree-boring insects are only looking for a bed-and-breakfast site to pass their larval stage, but they do serious damage to ornamental trees. If this is the only problem you notice, the tree may sprout a second set of leaves this summer, but they will be smaller than those on the "good side" of the tree. By H. T. Fernald [Public domain], via Wikimedia Commons. Personally, I've had luck with Bayer Advanced Tree and Shrub (available at WalMart and other similar stores in the garden section) for my maples. free shipping on orders over $100. For more information, see Entfact 405.
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