While Japanese maples are most commonly affected, other maples such as Acer pseudoplatanus ‘Brilliantissimum’ and Acer platanoides 'Drummondii' may also suffer from leaf scorch. Occurs in Fall as temperatures begin to drop. We have had a very wet spring/summer so far, so lack of moisture is not the problem. Also, excessive watering doesn’t do any favours to your potted Japanese maple tree, either, as this type of acer plant doesn’t thrive in waterlogged soils. Asked by Anonymous on August 1, 2020. You’ll sometimes see olive-colored streaks on the wood under the bark. Over-exposure to sun can result in brown leaves, a phenomenon also known as "leaf scorch." Thanks in advance, Marzia. Leaf curl survives in the hot summer on a Japanese maple tree in the form of spores. 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. 67% Upvoted. If your Japanese maple won’t leaf out, it’s very disappointing. Japanese maple trees are small ornamental trees that seldom grow taller than 20 feet. Identification: Black spots that range in size from a pin-prick to size of a half dollar (4 cm).Some reports say that the spots can get as big as two inches. In some cases whole leaves can become entirely crispy and there may be some minor die-back of branches. Small red areas appear on the emerging leaves, which then become thick and turn yellow and whitish-gray. as each year has been different but the results the same. Japanese maple leaves will often scorch in USDA hardiness zones 7b and 8 unless the tree is protected by shade and well-irrigated during times of drought. Compared with maple anthracnose, the spots are more rounded in shape and contain small, raised blisters. Leaves curling and drying up while other leaves changing colors. Anthracnose diseases generally infect the leaf veins and cause death of the vein and surrounding tissue. Unfavourable locations such as sandy soil, proximity to pavement or other obstructions that restrict root growth or exposed windy sites will also promote leaf scorch. Wanda Simone says: October 25, 2019 at 10:12 am . It can be caused by frost, cold, drying winds, dry or wet soil and sun. Few plants can equal the beauty and command of a Japanese Maple in the autumn landscape. Japanese maples may look delicate, with their lacy, red leaves and twisting branches, but they're actually pretty resilient. Anyway, we have a bloodgood in a container, planted about a year ago. Tiny clumps of sawdust indicate borers. punctatum. During very hot weather you may notice the ends of the leaves drying out and curling. These ornamental maples are prized for their foliage, diminutive size and value as a focal point for garden plantings. Stressed-out Japanese Maple have been known to drop every leaf from their branches and still recover beautifully — usually re-leafing during the same season! my Japanese maple is losing its leaves from only one part of the tree i have tested the soil for damp or dry but just damp down to 3 feet my tree is planted in a lawn which gets feed on a regular basis is it the wind and the sun burn tested the bark and it is green i had the tree for about 15 years . One of the very best Japanese Maples for all season color in sun or shade! I don't know if I should trim the tree at this time. The disease rarely results in fatality to a Japanese maple, but it may increase the likelihood of leaves falling prematurely and the tree moving into fall dormancy earlier than normal. 9 comments. Another problem is Verticillium Wilt - requires pruning to remove the affected branches. This is unsightly and may indicate that your tree needs more shade, but unless it occurs over a long period every year, it won't be fatal. Leaf scorch is caused by a variety of circumstances – wind burn, exposure to extremely hot sun, salt runoff from roadways, excessively alkaline soils or short intense drought periods. The surface of the leaves is affected, usually, without any lasting damage. When you identify leaf curl on a Japanese maple in one spring, there is no cure for that year. This wilt is caused by a fungus in the soil. Some you may be able to correct. My son brought this home from school in the 2nd grade, some 35 years ago. No dropping yet, just an off color and the curls. Leaf curl is identifiable on newly sprouting Japanese maple leaves and twigs in the spring. The leaves have been curling and falling for some time, but the tree is not dry. The “Bloodgood” leaves are a purplish red in spring, turn burgundy in summer and fiery fed in the fall. Japanese Maples prefer a moist but well-drained soil. 1. Although the Coral Bark is considered a cultivar that is more resistant to sun and heat it is no different that most Japanese maples when it comes to some tip burn in the warmer summer months. Water on the leaves of a Japanese maple, especially when the sun is shining during the hot afternoon hours, can scald leaves. They often produce a honeydew which attracts another Japanese maple problem, sooty mold . After infected leaves fall from tree, the Japanese maple will sprout new leaves, which are mostly normal. Cause: Normal Fall season foliage drop. However, the only way to be completely sure it isn't verticillium wilt is to have a sample tested at a diagnostic lab. Say your tree’s in a shadier spot, but is still sporting dull, brown leaves that are crisp and curling. In some cases whole leaves can become entirely crispy and there may be some minor die-back of branches. Hi Jules…it could be too much water (Japanese Maples don’t like to sit in wet soil), too little water, or that it’s getting too much sun. It seemed to be doing well up until the past month. Maple trees can have any number of diseases and other problems that can cause leaves to develop spots, turn yellow or brown--or die. Two days ago I noticed that quite a few of the leaves were turning brown and other brown leaves were on the ground . If the leaves of your Japanese maple have leaves that are wilting and turning yellow or brown, it might have Verticillium wilt. Lesions are a mix of lighter brown to black. 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