While not currently a menace in Michigan, the insects have already claimed 18,000 trees in neighboring Ohio, making its arrival almost inevitable. A response to an undesirable soil contaminant, such as salt (applied to roads for wintertime ice control), accumulation of fluorides in containerized soil mixes with perlite, or high levels of phosphate fertilizers. Although infested leaves shrivel and drop early, the pests cause little permanent damage. Leaves may yellow and drop early. Poplar trees belong to the willow family (Populus spp.) Physiological leaf scorch is the most common. Since the beetles do not consume the host plant material, dinotefuran and imidacloprid systemic soil treatments are ineffective. This problem occurs when a root entwines around another large root or the base of the tree and prevents or hinders water and nutrient movement. This information is supplied with the understanding that no discrimination is intended and no endorsement of brand names or registered trademarks by the Clemson University Cooperative Extension Service is implied, nor is any discrimination intended by the exclusion of products or manufacturers not named. In the spring spores are produced and dispersed to the new leaves of susceptible trees. These fruiting bodies occur in greater numbers on the upper leaf surface. But, healthy trees aren’t off the hook. They’re rarely found on Japanese maple, but some readers state they’ve seen this pest. Leaving one aphid alive can result in the production of a new colony very quickly. They often produce a honeydew which attracts another Japanese maple problem, sooty mold. Often these trees are less than four inches in diameter. Other Insects: Spider mites. It is caused by dry … As a result of the honeydew, sidewalks and cars become sticky. 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. Tree borer beetles include a wide range of insects which feed on trees. 5Neem oil may cause injury to Japanese maples. It is important to remember that while unsightly, they do not cause permanent injury to a tree. Maple trees are particularly susceptible to scale infestations. In small trees with light infestations, scale can be scraped off or infested branches can be removed and destroyed. Scales are unusual insects in appearance. As with all pesticides, read and follow all label directions and precautions. See Table 1 for specific products. Other Japanese maple pests are scale, mealybug and mites. The location of damage on the bark and the species of tree attacked aid in the identification of the insect involved. Table 1. The size of the tree, the need for specialized equipment, and the cost may prohibit this approach. So if you discover a tree with some kind of boring pest, it could very well have different insects active. Boring activity often starts a flow of tree sap or results in sawdust-like excrement (frass) which is visible in cracks and crevices. Physical barriers may also be used to prevent insects from attacking plants, especially in the vegetable garden. However, like all trees, their beautiful branches have a few enemies, particularly insects. Incorporate organic soil amendments into the soil to improve aeration and drainage of clay soils or to improve the water holding capacity of sandy soils. Their immature forms, called crawlers, are susceptible, however. Tar spots are among the most showy and least damaging foliar diseases. Scorch symptoms are light brown or tan dead areas between leaf veins or around the leaf margins. and are deciduous trees that can reach 40 to 60 feet in height at maturity. Fertilization of the tree after root removal will aid in recovery. Bacterial leaf scorch of maple (Xylella fastidiosa).John Hartman, Bugwood.org. Rake up all fallen leaves. Prevention & Treatment: The fungus survives the winter in fallen leaves. I am not sure what they are, but they are almost certainly just coincidental. Over time, they may girdle trees or weaken branches to the point that they break under pressure. Leaf Scorch: On maple (Acerspecies) trees a number of problems cause symptoms that are generally classified as leaf scorch. Scales vary in appearance depending on age, sex, and species. var today = new Date() Scorch symptoms are light brown or tan dead areas between leaf veins or around the leaf margins. Like aphids, soft scales, such as Pulvinaria spp., also excrete honeydew. Granulate ambrosia beetle (Xylosandrus crassiusculus) larvae (Motschulsky, 1866).Will Hudson, University of Georgia. The leaves curl up. Research indicates that spraying the infested trunks with permethrin may cause the beetles to leave the galleries they have already created. As one of the... Twig Pruner. Symptoms often start out as a marginal chlorosis or yellowing of the leaves before they fade to a drab green or brown color. Prevention & Treatment: The fungus survives the winter in fallen leaves. Carpenterworms (Prionoxystus robiniae) are wood-boring insects that attack maple trees. Insects affecting Japanese Maple Trees. Aphids will change their color based on the color of the plant juices they are feeding on. Once the gall forms, the pest is protected inside the structure. Prevention & Treatment: Several natural enemies, such as ladybird beetles (ladybugs) and lacewings feed on aphids. Identifying Insect Damage on Ash Trees. Since some insect pests respond only to very specific treatment, it is critical to know what you are protecting your shrubs and trees against. Gall development is a reaction by the leaf tissue to feeding or egg laying by various mites (such as Vasates quadripedes and Vasates aceriscrumena) and insects (such as Acericecis ocellaris and Cecidomyia ocellaris). Tree & Ornamental Insect Treatment A wide variety of insects attack trees and ornamentals in our landscape and can cause considerable damage, sometimes in a very short period of time. document.write(year) All recommendations for pesticide use are for South Carolina only and were legal at the time of publication, but the status of registration and use patterns are subject to change by action of state and federal regulatory agencies. Prevention & Treatment: The most effective control is to replant with resistant trees. When they break-and-enter, the larvae hatch from their eggs and bore holes into tree trunks and branches. Since little permanent damage results from woolly alder aphids, tolerating some damage is a good choice. There are also several 1/8 to 1/4 inch … Chemical treatments are rarely needed and must be repeated indefinitely. This group of insects includes the exotic Asian longhorned beetle …

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