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Oct 7, 2023 · Phyllosticta leaf spot. Brown spots on the leaves. Spray the leaves with triazole fungicide. Phytophthora Root Rot. Browning of the leaves. Plant Japanese maple only in well-drained soil. Tar spot. Black spots on the leaves. Spray the leaves with a multi-purpose fungicide.
Apr 3, 2024 · For a Japanese maple currently carrying cankers, prune away infected branches several inches behind the symptomatic tissue. Be sure to dispose of them promptly, and only make your cuts in dry weather with sharp, sterile blades. To address cankers on the trunk, you should consult an arborist or plant pathologist. 3.
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- Leaves Curling. One of the first signs of distress in a Japanese maple is curling leaves. This is often a symptom of dehydration or lack of water, especially during hot, dry periods.
- Leaves Turning Brown. Browning leaves can be a common issue in Japanese maples. This is often caused by environmental stressors such as extreme temperatures, wind, and sun exposure.
- Leaf Scorch. Leaf scorch is often characterized by brown, dried-out patches on the leaves, which can give the tree a scorched appearance. Leaf scorch can be caused by a variety of factors, but it’s most commonly associated with environmental stressors.
- Slow Growth. Japanese maples are not known for rapid growth, but if your tree seems to be growing particularly slowly, it could be due to a few factors.
- Aphids. Aphids are always at the top of the list of pests that you can find on nearly any plant. These pretty trees are no different, and a variety of aphid species love to hang out and suck on them.
- Beetles. Japanese beetles (Popillia japonica), granulate ambrosia beetles (Xylosandrus crassiusculus), and vine weevils (Otiorhynchus sulcatus) are all types of beetles that might attack these delicate, attractive maples.
- Caterpillars. A variety of caterpillars are attracted to Japanese maples, including leafrollers. They chew through the foliage, creating holes in the middle and around the edges of leaves.
- Mealybugs. Mealybugs are light gray to white insects, often covered in powdery white wax. They have filaments along the edge of their bodies, and some even have tails.
Mar 29, 2021 · They often produce a honeydew which attracts another Japanese maple problem, sooty mold. Wilting leaves, or leaves that are curled and puckered, may be a sign of another common Japanese maple pest: aphids. Aphids suck plant sap from the tree and a large infestation can cause distortions in tree growth. Tiny clumps of sawdust indicate borers.
- Jackie Rhoades
Sep 21, 2017 · Maple tree leaves often develop tiny, mushroom-shaped bumps. These growths are most common on silver maples, but red and sugar maples experience them as well. The bumps emerge pale green from the leaves' surfaces before deepening to red. While unsightly, especially on trees grown primarily for their foliage, these blemishes are a maple tree's ...
Sep 26, 2023 · 1. Alternaria Leaf Spot. Fungi in the Alternaria genus cause dark brown to black spots on the foliage. These spots may or may not have yellow halos. If the leaves are heavily infected, they will drop from the tree. In bad infections, a young or small Japanese maple can be completely defoliated.
