If you’re unsure of the cause, give us a call and we’ll be happy to help. Leaves: Deciduous, in opposite pairs, simple, long stalked 3-9 prominent veins radiating from the stalk at the base of the leaf, usually palmately lobed with. It can be tough to diagnose exactly what’s affecting your Japanese Maple. This spraying may require starting in early spring to reduce the mite’s population. Mites are very, very small and should be properly identified first before any spraying takes place. Mite infestations also cause the tree’s leaves to dry up and drop.
The adult is 1/8 inch long, pale green, and wedge-shaped. Other trees susceptible to damage are apple, ash, birch, crabapple, dogwood, oak, elm, hickory, and redbud.
Mites may also infest your Japanese Maple. A pest that can also attack agricultural crops, Potato leafhoppers can be pests of maples in nursery production. If this disease persists for more than a couple of years, we can spray the tree with a copper fungicide in spring as the leaves emerge. The best control is to pick up all these leaves in the fall and dispose of them off-site in a sealed plastic trash bag. In spring, Japanese Maple leaves may be affected by a disease called Pseudomonas syringes This bacterial disease makes leaves curl and dry up as the summer progresses. In some cases, a trunk injection with an antibiotic can be helpful since this is a bacterial disease. To control this disease, keep the tree healthy with adequate water and fertilizer. Japanese Maples can be susceptible to a disease called Verticillium Wilt, which causes leaf browning and curling (although it’s generally confined to individual branches instead of an overall browning). It could be due to environmental causes, wind damage, or even high humidity (it can sometimes cause the tips and edges of Japanese Maple leaves to curl).ĭry, curling leaves can also be due to bacterial and/or fungal diseases or insect damage. 
What could be causing this and what should I do?Ī. There are several reasons why a Japanese Maple leaf would be dry and curled. The leaves on my Japanese Maple have started to turn brown and are curling at the edges.
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