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24 Tips to White Spots On Japanese Maple Tree Bark | Common Insect Pests of Maple in North Carolina

  • This plant fungus targets apple trees and other fruit trees. In some cases, there will eventually be a white or yellowish, fan-shaped mushroom that grows between the wood and the bark. Instead of brown rot, this one has a white, spongelike rot when no mushrooms are present. - Source: Internet
  • Choice shade trees may be examined carefully at least twice a year, in September and May, for sawdust on the bark. When a burrow has been discovered, the grubs may be cut out, or killed by running a wire into the burrow. The opening to the burrow may then be closed. Maintaining adequate watering may be helpful in preventing infestation. - Source: Internet
  • Norway maples are notorious for producing roots that grow around the tree instead of away from the trunk in the normal manner. As girth increases, the girdling root strangles the tree, causing leaves on one side to scorch, or small leaves sparsely arranged on twigs, and a dying back of branches. Growth is slow, and the whole tree dies. A flat side on the trunk usually indicates a girdling root is below ground. - Source: Internet
  • APHIDS Skip to APHIDS Aphids are soft-bodied insects that feed on plant fluids with piercing-sucking mouthparts. They can be found on bark or leaves and often occur in colonies. They do not usually cause serious damage, but can cause leaf distortion or aesthetic damage from sooty mold growth. - Source: Internet
  • Small (1/4 inch) grayish-tan spots with purple borders are scattered over the leaves. Tiny black dots in the spots are fruiting bodies of the fungus. Usually more severe on red, sugar, and silver maple but can occur on Japanese and Norway maple. - Source: Internet
  • This disease is more common on Norway and Japanese maples than on sugar maple. Foliage on one branch or one side of the tree wilts, and sapwood occasionally shows intermittent green or green-black streaks. Some trees die quickly but others linger. The infection usually starts in the roots since this fungus is soilborne. - Source: Internet
  • Becoming a property owner means that you’re going to get thrown into the world of landscaping without expecting it. With so many new plants to take care of, knowing which trees are healthy and which trees are suffering is vital. Many basic gardeners spend a good chunk of time figuring out how to get rid of white tree fungus. Of course, white fungus on tree bark could be a number of different fungi. - Source: Internet
  • Powdery mildew is a fungal disease that leaves a superficial, white, dusty coating on leaves of a wide variety of plants. The cause is a group of related fungi that each attack a limited number of closely related plants. Powdery mildew tends to create a problem for gardeners in middle to late summer, reducing the strength and damaging the appearance of infected plants, but rarely killing them. Phyllactinia guttata is the fungus that afflicts maples, and it can pass the infection to other trees including birch, horse chestnut, hornbeam and dogwood. - Source: Internet
  • Norway maples have been widely planted, and though they are short-lived, they are fairly hardy in our climate and are more tolerant of road salt than sugar maples. Maple leaves are subject to sunburning, especially if hot sunny days follow a prolonged period of cloudy weather in spring. Sunburning resembles anthracnose infection and can be differentiated only by laboratory examination. Sunburning usually occurs on the south or southwest side of a tree, especially on those in exposed locations. Early infection of maple wilt in a large tree, or a girdling root, may resemble this trouble. - Source: Internet
  • Verticillium wilt is a serious disease that is not well treated. The pathogens of this disease enter through cracks in the bark or through wounds. Nematodes play an important role in its spread. - Source: Internet
  • I have a 25 year old Japanese maple tree that has been losing leaves and branches over the past 6 years. The bark looks like it may have a fungus of some sort. The bark is peeling off near the base and there are whitish patches on the tree trunk. Can this tree be saved? - Source: Internet
  • Bacterial leaf scorch (red maple) Leaf margins on localized, individual branches brown in mid- to late July. The light-brown area is separated from green tissue by a dark reddish-brown band and a narrow but distinct yellow halo. Leaves may fall in August. Xylella fastidiosa Leafhoppers and spittle bugs carry the bacteria from tree to tree. Promote plant vigor by protecting the tree from stresses. - Source: Internet
  • Bleeding canker Reddish-brown cankers develop in the inner bark of the main trunk and branches. The bark over the canker becomes sunken, and reddish-brown sap oozes out. Leaves wilt and branches die. Phytophthora cactorum Remove the infected tree and do not replace it with a woody ornamental until the soil has been fumigated and aerated thoroughly. - Source: Internet
  • Tar spot Oval to irregularly shaped, shiny, black spots up to ½ inch in diameter form on the leaves of silver or red maples. Rhytisma acerinum or R. punctatum No control measures are necessary. - Source: Internet
  • On maple leaves, there are several forms of galls caused by mites and midges. Some of the more common of them are the maple leaf spot gall, Cecidomyia ocellaris, on red maple; the maple bladder gall, Vasates quadripedes, and the maple spindle gall, Vastates aceriscrumena, on silver maple; and the gouty vein gall, Dasyneura communis, on sugar maple. Spraying with malathion, which is among the compounds registered for control of this pest in Connecticut, in early May can be helpful in destroying the mites before galls are formed. Consult the label for dosage rates and safety precautions. - Source: Internet
  • There also appears to be a secondary damage near the base of the tree which could have been the result of mechanical or wildlife damage. Birds may be looking for insects in the crack or tear of the bark. Do you see any holes in the bark? Beetles bore holes in the bark to the cambium layer and lay eggs. The larvae are what causes the initial damage to the bark, and then other wildlife looking for them, may peel and damage the bark further. - Source: Internet
  • This insect can best be controlled by a dormant horticultural oil spray in early spring. However, sugar maple trees may be more sensitive than other maples to injury from horticultural oil. Spraying with malathion, or insecticidal soap, which are among the compounds registered for use against this pest in Connecticut, when the young are crawling will be helpful in control. Imidacloprid, applied early in the season as a soil drench, will provide season-long systemic control, but should not be used on trees being tapped for syrup. Consult the labels for dosage rates and safety precautions. - Source: Internet
  • This beetle, in the adult stage, feeds upon a great variety of trees and plants, including maple. The beetle is 1/2" long, bright, shining green, with copper colored wing covers. Two white spots on the tip of the abdomen show beyond the ends of the wing covers, and there are five white spots formed by patches of white hairs on each side of the abdomen. The beetles begin emerging in late June but their greatest abundance is usually about the middle of July. During drought periods populations of Japanese beetle are drastically reduced. - Source: Internet
  • First, the wood on the ground has mold and fungi that are growing as the logs decay. This is normal and is not related to the issue on the live maples. Second, the black spots on the leaves in summer are likely tar spot. The amount of tar spot that develops usually depends on whether or not a summer is particularly wet or dry and rarely affects the health of the tree overall. - Source: Internet
  • Cankers start as depressed areas on the bark which quickly girdle twigs, branches, or trunks. Leaves, beyond the point of attack, wilt but remain attached to the tree. Eventually everything beyond the canker dies. Either the Nectria or wilt fungus or a girdling root may be suspected in cases where one branch of a tree turns red in the fall before the rest of the tree. - Source: Internet
  • Powdery mildew is inhibited by extreme heat and extended periods of rain. Some powdery mildews can assume a form that allows them to live on the bark or buds of their victim through the winter and that is the case for maples. So good care and location is essential. I recommend this Missouri Botanical Garden fact sheet about Japanese maple care so you can give your tree the best possible care and position. - Source: Internet
  • Leaf Scorch: On maple (Acer species) trees, a number of problems cause symptoms that are generally classified as leaf scorch. Scorch symptoms are light brown or tan dead areas between leaf veins or around the leaf margins. Occasionally the leaf margins are yellow or chlorotic. Scorch symptoms tell us that one or more of the following factors are affecting the tree: - Source: Internet
  • Asian Ambrosia Beetles: Japanese maples are among the more common hosts of the granulate ambrosia beetle (Xylosandrus crassiusculus), with other hosts including styrax, ornamental cherry (especially Yoshino), pecan, peach, plum, dogwood, persimmon, sweetgum, magnolia, fig, Chinese elm, and azalea. This pest is attracted not only to damaged, stressed, or transplanted trees but to seemingly healthy trees as well. The beetle becomes active in early March (or earlier), and the female beetles bore into trunks or branch wood of thin-barked hardwood trees. Once a tree has been attacked, it becomes more attractive to further attack. Often these trees are less than four inches in diameter. - Source: Internet
  • This fungus produces raised black spots that look like blobs of tar on the leaves. Depending upon the fungal species, spots can be irregular and up to one-half inch in diameter or can appear as tiny, pinpoint dots in clusters. Silver and Norway maples are very susceptible, but it is usually unsightly rather than serious, although significant defoliation can occur. - Source: Internet
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