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Red japanese maple leaf12/7/2023 The Clemson Cooperative Extension Home and Garden Information Center has a factsheet on common maple diseases and insect pests. It self-seeds easily so can spread and become weedy in the landscape. See potential insect and disease problem fact sheets to the left. Insects, Diseases, and Other Plant Problems: Aphids, scale, maple worms, leafrollers, and leafhoppers are occasional pests. Anthracnose, leaf scorch, and frost damage, especially from late frosts, can occur. Plant as a specimen or woodland tree in acid to neutral well-drained soil. In warmer areas, it will benefit from afternoon shade and may need extra moisture if grown in full sun. This slow-growing tree will remain quite small in colder climates (USDA zone 5). Typically the leaves turn red/purple in spring, but may fade to a green/bronze in summer heat. This variety name refers to the red/purple leaf color and is used for many red-leaved seedlings. Acer is Latin for sharp and palmatum means shaped like a hand, referring to the leaves. Japanese maple parent plants are native to southeast Korea and central and south Japan. This plant is one of the most commercially valuable landscape trees because of its dramatic leaf characteristics. Red-leaf Japanese maple (Sapindaceae family) is a small, 25 foot high, maple variety with striking purple leaves that turn red in autumn. Proper annual pruning, cleaning up of fallen leaves and twigs, and yearly replacement of mulch will help prevent the infection and spread of these Japanese maple tree diseases.Phonetic Spelling AY-ser pal-MA-tum at-ro-pur-PUR-ee-um Description Again, mature Japanese maple trees will probably recover but young trees may not. Moist, sunken bruising on leaves is a sign of anthracnose. It sometimes affects only one side of the tree, leaving the other looking healthy and normal. It is a soil dwelling fungus with symptoms that include yellowing leaves that fall prematurely. Verticillium wilt is another common Japanese maple disease. A mild case of canker will resolve itself, but heavy infection will kill the tree. The most common Japanese maple diseases are caused by fungal infection. Milder cases can cause scarring.Ī strong spray of water and regular treatment with either chemical or organic pesticides will go a long way to prevent insect problems with Japanese maples. At worst, they can cause the death of branches or even the tree itself by girdling the limb with their tunnels. These pests drill into the bark and tunnel along the trunk and branches. Aphids suck plant sap from the tree and a large infestation can cause distortions in tree growth. Wilting leaves, or leaves that are curled and puckered, may be a sign of another common Japanese maple pest: aphids. They often produce a honeydew which attracts another Japanese maple problem, sooty mold. All of these pests present as tiny bumps or cottony dots on twigs and on leaves. While these Japanese maple pests can attack a tree of any age, they are usually found in young trees. Other Japanese maple pests are scale, mealybug, and mites. These leaf feeders can destroy the looks of a tree in a matter of weeks. The most common Japanese Maple pests are the Japanese beetles. There are several possible insect problems with Japanese maples. 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. Its red, lacy leaves are a welcome addition to any garden, but they aren’t problem free. A Japanese maple is a glorious specimen tree.
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