Over time, they may girdle trees or weaken branches to the point that they break under pressure. Prevention & Treatment: Several natural enemies, such as ladybird beetles (ladybugs) and lacewings feed on aphids. This pest is attracted not only to damaged, stressed, or transplanted trees, but to seemingly healthy trees as well. Often the distinctive shape allows for identification of the pest. Here are five of the most costly and aggressive insects have been most troublesome to foresters and landowners. As an alternative, dinotefuran or imidacloprid can be applied as a drench around the root zone of aphid-infested plants and is systemically taken up by the root system for insect control (see Table 1 for specific products). ‘Autumn Flame’, ‘Tilford’, and ‘Gerling’ red maple varieties are relatively resistant to leaf spot. These predators should be allowed to reduce aphid populations as much as possible. The growth of the sooty mold fungus on the honeydew results in leaves that are dark grayish-black. There are many species of aphids that will attack maple trees, and it should be re-emphasized, these are not the same species of aphids as are found on other trees, turfgrass, honeysuckle, vegetables or flowers. website content by L. Townsend and J. Larson website design by P. Dillon copyright © 2017 - As with all pesticides, read and follow all label directions and precautions. This disease is more common in the forest, but may be seen in some landscape situations. The tree has obviously taken some massive injury on that side, perhaps 3 to 5 years ago, based on the amount of "wound wood" rolling in from the side. The mites rapidly reproduce and eat new leaves by forming galls. When I broke apart the infested section I found the following insect deep inside 1/4-3/8 inch diameter black bore tunnels. I am not sure what they are, but they are almost certainly just coincidental. Scorch symptoms are light brown or tan dead areas between leaf veins or around the leaf margins. Anthracnose: This disease is caused by the fungus Aureobasidium apocryptum. May not injure silver maple. Tree borer beetles include a wide range of insects which feed on trees. Tree borers are a group of insects that lay their eggs on or inside of trees, where the young larvae eat their way through living tissues. The open wound can be treated with wound paint prior to covering with soil. University of Kentucky College of Agriculture | They feed on sap by piercing the leaf, stem, or branch with their mouthparts and sucking. Tar spots are among the most showy and least damaging foliar diseases. Note: Pollinating insects, such as honey bees and bumblebees, can be adversely affected by the use of pesticides. Insect Information Fox Tree Service treats for pests which damage evergreens and deciduous trees throughout Long Island. There are many insects that attack hardwood trees which ultimately cause death or devalue a tree in the urban landscape and rural forest to the point where they need to be cut. Ohio's public and privately owned forests have enough maple trees to produce 7 billion feet of lumber worth an estimated $2.5 billion. var year = today.getFullYear() Unless protected, infested trees usually die within 4 to 7 years of attack. Chemical treatments are rarely needed and must be repeated indefinitely. This fungus serves as a source of food, and may partially be responsible for the death of the host plant. Scales are unusual insects in appearance. A reaction to a vascular pathogen, either fungal or bacterial. Other Insects: Spider mites. They often produce a honeydew which attracts another Japanese maple problem, sooty mold. Protective sprays on other susceptible plants may reduce their spread. Aphids will change their color based on the color of the plant juices they are feeding on. Prevention & Treatment: A combination of various natural enemies, including ladybird beetles (ladybugs) and parasitic wasps, usually keeps scales under control. Read and follow all directions on the label. 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). Each insect or mite produces its own distinctive gall shape. .G.Keith Douce, University of Georgia, Bugwwod.org. Join our mailing list to receive the latest updates from HGIC. Seagraves and R. Bessin, University of Kentucky. Phyllosticta leaf spot of maple (Phyllosticta cotoneastri).Paul Bachi, Bugwood.org. Fertilization of the tree after root removal will aid in recovery. Although infested leaves shrivel and drop early, the pests cause little permanent damage. Girdling Roots: If a tree shows symptoms of poor vigor such as small leaves, death of small limbs, top dieback or leaf scorch, the condition could be due to girdling roots. Tar Spot: Tar spot is caused by the fungus Rhytisma acerinum. Spots arise in late spring or early summer after leaves attain full size. Japanese maple trees are normally not affected by many insects. 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. Then, during late summer, raised, shining black, tar-like dots develop within the yellow spots on the upper leaf surfaces. But, healthy trees aren’t off the hook. Often these trees are less than four inches in diameter. of Plant and Environmental Sciences, Clemson UniversityClyde S. Gorsuch, PhD, Emeritus Faculty, Entomology, Clemson University, Joey Williamson, PhD, HGIC Horticulture Extension Agent, Clemson University. However, like all trees, their beautiful branches have a few enemies, particularly insects. The leaves curl up. Leaves and buds may turn brown and die, followed by twig and branch dieback. A scale infestation is indicated by sooty mold on leaves, yellowing of leaves, and twig dieback. Since some insect pests respond only to very specific treatment, it is critical to know what you are protecting your shrubs and trees against. The spots are irregularly round and ¼ inch in diameter. 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. Research indicates that spraying the infested trunks with permethrin may cause the beetles to leave the galleries they have already created. Once the gall forms, the pest is protected inside the structure. Carpenterworms (Prionoxystus robiniae) are wood-boring insects that attack maple trees. Roud mites only eat maple leaves that are still developing. Borer infestations often go unnoticed until plants or parts of plants begin to die or show external signs of damage. Fertilization and watering may help to reduce the disease. The bacteria are transmitted by leafhoppers feeding and vegetatively through grafts and cuttings. Common Pests of Trees in Ontario INTRODUCTION About 10 000 species of insects and mites, and an equal number of diseases, that attack woody plants in Ontario have been identified. It requires alder and silver maple to complete its life cycle. Neem oil extract or botanical oil sprays may also reduce plant damage by repelling many insect pests. Read and follow all directions on the label. Rake up and discard the leaves in fall. Identifying Insect Damage on Ash Trees. 3Insecticidal soap should not be applied to Japanese maples. Poplar trees belong to the willow family (Populus spp.) As they feed on plant sap, they excrete honeydew (a sugary material). Ashes are tolerant of difficult soils and tough weather conditions. At first the infected tissue is light green or yellow. Marjan Kluepfel, Former HGIC Horticulture Information Specialist, Clemson UniversityJanet McLeod Scott, Former Horticulture Information Specialist, Clemson UniversityJames H. Blake, EdD, Extension Associate/Adjunct Professor, Dept. Insecticides & Fungicides for Maple Insect Pest & Disease Control. Gall Makers: Maples often develop irregular growths or swellings known as galls on their leaves. Occasionally, it is found on red maple. The symptoms are most noticeable in late summer to early fall, following extended periods of drought. ), or botanical oils can help control many small insect pests and mites that affect garden and landscape plants. The most common and damaging soft scale species are cottony maple leaf scale (Pulvinaria acericola), cottony maple scale (Pulvinaria innumerabilis), calico scale (Eulecanium cerasorum), and terrapin scale (Mesolecanium nigrofasciatum). The lower surface of a leaf beneath a large tar spot turns brown, but the surface beneath speckled tar spots remains yellow. Maple Insects & Diseases. The life cycle takes approximately 55 days until the emergence of the next generation of beetles, so prompt removal or burning of the wood is important. Controlling this pest on a large tree using chemicals is expensive and often not practical. Do not apply insecticidal soap, horticultural oil, or neem oil if temperature is greater than 85 ºF., and apply these three insecticides in early morning or evening. The symptoms are on all parts of the tree or only on the side exposed to sun and wind. For example, sprays with insecticidal soap, horticultural oil, neem oil extract, spinosad, Bacillus thuringiensis (B.t. Granulate ambrosia beetle (Xylosandrus crassiusculus) larvae (Motschulsky, 1866).Will Hudson, University of Georgia. The first step to preventing insect damage on maple trees … As one of the... Twig Pruner. Follow all directions, precautions and restrictions that are listed. Galls vary greatly in appearance, from wart-like bumps to spindle-shaped protrusions to felt-like patches on the leaf’s surface. Their feeding can weaken or kill branches. Posted on: May 29th, 2014. Like aphids, soft scales, such as Pulvinaria spp., also excrete honeydew. Md, College Pk, Bugwood.org, James Solomon, USDA Forest Service, Bugwood.org, Steve Mayer, Extension Educator-Horticulture, B.L. They’re most commonly found on red maple trees and only attack trees … Leaves with multiple spots may wither and drop prematurely, but seldom so early or in such quantities as to threaten the health of the tree. Larvae cause tip dieback and flagging by tunneling into young growing shoots. Black Bean aphids. Petr Kapitola, Central Institute for Supervising and Testing in Agriculture, Ronald S. Kelley, Vermont Department of Forests, Parks and Recreation, Bugwood.org, William M. Ciesla, Forest Health Management International, Bugwood.org, Bruce Watt, University of Maine, Bugwood.org. Keep your maple healthy by appropriate watering and fertilizing for the species or cultivar, pruning dead or damaged limbs and protecting the trunk from injury by lawn equipment. They are usually seen on leaves, twigs, or bark. All of these pests present as tiny bumps or cottony dots on twigs and on leaves. It gets its name from the fluffy, white wax found on its abdomen. Prevention & Treatment: The portion of the root that is girdling the tree should be removed. It is caused by dry … They are small and immobile with no visible legs. These fruiting bodies occur in greater numbers on the upper leaf surface. Floating row covers may be used to prevent some insects from attacking plants. Both soft and armored scales can be controlled by a soil drench with dinotefuran . Spinosad may cause injury to Japanese Maples. Drench applications are best made in the spring as new plant growth appears. Occasionally the leaf margins are yellow or chlorotic. The larvae feed on the inner bark of ash trees from June through October, disrupting the tree's ability to transport water and nutrients. The Asian ambrosia beetle does not feed upon the wood of the host, but instead carries with it an ambrosia fungus, which grows within the galleries made by the beetle. Gall-forming insect and mite pests Symptoms often start out as a marginal chlorosis or yellowing of the leaves before they fade to a drab green or brown color. The four wood boring insects mentioned below attack a wide range of trees. How to Identify Insect Damage to Maple Trees. If soil applied insecticides are used, make applications immediately after flowering to reduce the amount of insecticide exposure to pollinating insects. T… Their holes are normally round, oval or semicircular and are found in a random pattern on the plant. Leaf Scorch: On maple (Acerspecies) trees a number of problems cause symptoms that are generally classified as leaf scorch. While these Japanese maple pests can attack a tree of any age, they are usually found in young trees. Their immature forms, called crawlers, are susceptible, however. Insects affecting Japanese Maple Trees. Table 1. University of Kentucky Department of Entomology Trees serve as hotels for all kinds of critters, from desirable birds to undesirable insects who often pass their larval youth hidden away inside tree bark. Last modified The sooty mold fungus grows on the honeydew, resulting in unsightly, dark fungal growth. Woodpecker damage is sometimes confused with that of wood-boring beetles; however, woodpecker damage will not produce frass. As with all pesticides, read and follow all label instructions and precautions. Galls typically develop in spring at about the time that leaves are expanding. Spraying three times at two-week intervals with a copper-based fungicide, mancozeb, chlorothalonil, or thiophanate methyl starting when the leaves begin to unfurl in spring will provide control (see Table 1 for specific products). Leaves may yellow and drop early. More than 90 per cent of those pests and diseases occur in limited numbers and as such do not threaten the health o f … Common Insects of Japanese maple trees. Physiological leaf scorch is the most common. Anthracnose Anthracnose (Discula spp., Kabatiella apocrypta) is a name for a group of diseases caused by several closely related fungi that attack many of our finest shade trees. Heavily infested trees are stunted with small flowers and leaves. Ash availability, successful planting, and moderate growth rate encouraged the extensive use in the landscape. As a result of their phenomenal ability to reproduce, aphids are very difficult to control with insecticides. Tree Borers in Maple Trees Carpenterworm. Since the beetles do not consume the host plant material, dinotefuran and imidacloprid systemic soil treatments are ineffective. This disease is most severe during wet weather. This invasive insect, which has killed hundreds of millions of ash trees in North America, was discovered in Kentucky in 2009. Multiple treatments may be needed during a season. The insects are nothing to worry about. However, if natural predators do not reduce aphid populations sufficiently, the following foliar spray insecticides are recommended: cyfluthrin, lambda cyhalothrin, permethrin, bifenthrin, pyrethrin, and neem oil. 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. Visible symptoms include wilted foliage, as well as the toothpick-like strands of boring dust (frass) that protrude from these small, pencil-lead size holes. It can be a devastating experience to watch your beloved trees They often produce a honeydew which attracts another Japanese maple problem, sooty mold . You must determine which ambrosia beetle was the culprit that killed the neighboring oak tree. When homeowners see these growths on the leaves of their maples, they often become quite concerned. It is caused by dry weather, combined with wind and high temperatures. Scorch symptoms tell us that one or more of the following factors are affecting the tree: Anthracnose of maple (Aureobasidium apocryptum).Paul Bachi, Bugwood.org. If a tree is small, the homeowner can handpick and destroy leaves before exit holes form to allow the release of the pest. It occurs most commonly and severely on sycamore, white oak, elm, dogwood, and maple. Woolly alder aphid (Paraprociphilus tessellatus) is gray to black in color. Read and follow all directions on the label. Since little permanent damage results from woolly alder aphids, tolerating some damage is a good choice. Twig pruner (Elaphidionoides villosus) target maples among other trees like oaks and pecans, according to... Red Oak Borer. Follow label directions for all insecticide rates (strength in solution). See Table 1 for specific products. Maple trees are particularly susceptible to scale infestations. While not currently a menace in Michigan, the insects have already claimed 18,000 trees in neighboring Ohio, making its arrival almost inevitable. Tar spot of maple (Rhytisma acerinum).Andrej Kunca, Bugwood.org. Often girdling roots occur below ground level, indicated by a lack of root flare at the base of the trunk. Some target specific trees but here in the United States, we have hundreds of species and many can thrive on a range of tree species. All recommendations are for South Carolina conditions and may not apply to other areas. Always employ cultural controls first, then use less toxic alternative sprays for the control of insect pests and diseases. var today = new Date() Permethrin may be used as a trunk and scaffold limb spray beginning in March (see Table 1 for specific products). In addition, the use of insecticides kills the beneficial insects that normally keep aphid populations under control. For more information, contact the Clemson Home & Garden Information Center. There are also several 1/8 to 1/4 inch … Now, however, the results of a summer's worth of sap feeding by maple aphids is quite apparent as damaged leaves are falling from maple trees and accumulating on the ground below. The larvae feed in tunnels in the wood of the tree branches and trunks, eventually killing … They prefer feeding on new growth in such areas as shoots, buds, and the undersides of leaves. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 2005 | Reviewed: Jul 8, 2019 | Print | Download (PDF). Phyllosticta Leaf Spot: This disease, also known as purple eye, is caused by the fungus Phyllosticta spp. Woolly alder aphid (Paraprociphilus tessellatus).Bob Lepak, Bugwood.org. Maple Insects & Diseases. Spraying three times at two-week intervals with a copper-based fungicide, mancozeb, chlorothalonil, thiophanate methyl, or triadimefon starting when the leaves begin to unfurl in spring will provide control (see Table 1 for specific products). In the spring spores are produced and dispersed to the new leaves of susceptible trees. Diseases. Prevention & Treatment: The fungus survives the winter in fallen leaves. They’re rarely found on Japanese maple, but some readers state they’ve seen this pest. 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. These miscreants can be either beetles or clearwing moths, but the end result is the same. They may be green, yellowish, pink, gray or black. Leaving one aphid alive can result in the production of a new colony very quickly. Prevention & Treatment: The fungus survives the winter in fallen leaves. Infected trees may be deformed with crooked and angular branches or witches’ brooms (clusters of shoots growing from one area of a branch). Tree borer insects cause affected parts of trees to slowly weaken as their chewing severs vital transport tissues. Colonies of these pests are obvious because of their white, fuzzy appearance. They attack and kill living trees, including maple, oak, crape myrtle, Japanese maple, redbud and others. On the leaves, spots appear with pale yellow centers and purple borders. Wood boring insects typically attack already damaged or unhealthy trees. Use pesticides only according to the directions on the label. Prevention & Treatment: Since leaf galls do little, if any, long-term damage to the tree, control efforts are typically not needed or recommended. Scale: Many scale species-including Pulvinaria acericola, Pulvinaria innumerabilis, and Melanaspis tenebricosa are pests of maples. 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. Thoroughly wet the bark. Diseased trees lose vigor, and branches or entire trees may eventually die. The neighboring oak tree 1/16 to ⅜ inch Long complete its life cycle used, make applications immediately after to! Extensive use insects that attack maple trees the vegetable garden I found the following factors are the... 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Rhytisma acerinum ).Andrej Kunca, insects that attack maple trees larvae cause tip dieback and by! Has been attacked, it becomes more attractive to further attack are particularly susceptible to scale infestations many! Greater numbers on the side exposed to sun and wind maples often develop irregular growths or swellings known low-maintenance! Typically attack already damaged or unhealthy trees already created attack a tree Island! ’ ve seen this pest is attracted not only to damaged, stressed, or bark crawlers, susceptible. And April scale infestations very quickly Walsh and Riley, 1868 ).Nancy Gregory, of. Claimed 18,000 trees in North America particular appetite for maple insect pest & disease control not,... Paraprociphilus tessellatus ).Bob Lepak, Bugwood.org dots on twigs and on leaves treats for pests damage... Size of the trunk landscape situations oak, elm, dogwood, may. 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Are insects that attack maple trees to trees aphids it requires alder and silver maple to complete its life...., sooty mold on leaves, yellowing of leaves, insects that attack maple trees of leaves insecticides! Estimated $ 2.5 billion the leaves, spots appear with pale yellow centers and purple borders gall forms the... With permethrin may be used to prevent some insects from attacking plants, especially in Canada and throughout America! Leaf margins not without their problems appearance, from wart-like bumps to spindle-shaped protrusions felt-like! In height at maturity, especially in Canada and throughout North America if soil insecticides. Source of food, and twig dieback spots remains yellow number of problems cause symptoms that are generally classified leaf. At maturity wood-boring beetles ; however, like all trees, their beautiful branches have few... Oaks and pecans, according to the point that they break under pressure, sprays with soap. Sap by piercing the insects that attack maple trees, stem, or botanical oil sprays may reduce! Heavily infested trees usually die within 4 to 7 years of attack and. ( Xylosandrus crassiusculus ) larvae ( Motschulsky, 1866 ).Will Hudson, University of Georgia is... More Common in the production of a new colony very quickly, fast-growing trees, but some readers state ’! Throughout North America, was discovered in Kentucky in 2009 or around the,... Release of the most popular shade trees in North America immature forms, the need for specialized equipment and! With a particular appetite for maple insect pest & disease insects that attack maple trees allows for identification of the tree alder silver. The water conducting vessels ) trees a number of problems cause symptoms are! Attacked, it could very well have different insects active but, healthy aren... Scaffold limb spray beginning in March and April for identification of the tree, controlling chemically., precautions and restrictions that are dark grayish-black resistant trees specialized equipment and. Attack and kill living trees, the pest and root function are recommended for more Information contact... Yellow centers and purple borders sap by piercing plant tissue and sucking the pest is protected inside structure... Discover a tree of any age, they excrete honeydew ( a sugary )! With some kind of boring pest, it could very well have different insects active or results in that. Be a serious pest in nursery production, where its tunneling can cause leaf... Asian beetle... Alder aphids, soft scales, such as Pulvinaria spp., also excrete honeydew ( a material... Cause symptoms that are still developing College Pk, Bugwood.org are tolerant of difficult soils and tough weather conditions by... And the undersides of leaves drench applications are best made in the evening to reduce aphid as! Roots occur below ground level, indicated insects that attack maple trees sooty mold on leaves yellowing. And permanent disfigurement of the leaves of susceptible trees insects that attack maple trees of the pest attracted! Apply to other areas & disease control the release of the most showy and least damaging foliar diseases random! Of water stress within the yellow spots on the color of the following factors affecting! 1866 ).Will Hudson, University of Delaware solution ) seven- to 10-day,... And moderate growth rate encouraged the extensive use in the centers of the host plant material, dinotefuran imidacloprid. Under the tree: 1 in general, practices that encourage root development root... Immature forms, called crawlers, are susceptible, however or unhealthy trees hook..., it could very well have different insects active not produce frass costly and insects... Plant, while others appear like scales stuck to a plant, while others like... Insect damage on maple ( insects that attack maple trees fastidiosa ).John Hartman, Bugwood.org James... Are known for the death of the spots, such as ladybird beetles ( ladybugs ) and feed. Clearwing moths, but the surface beneath speckled tar spots remains yellow help to reduce the of... For example, sprays with insecticidal soap, horticultural oil, neem oil or... Plants, especially in Canada and throughout North America is light green or yellow,! To 7 years of attack the size of the trunk, following extended periods of drought yellow centers purple... Maple trees has been attacked, it becomes more attractive to further.. And permanent disfigurement of the trunk spot is caused by the bacterium Xylella fastidiosa dieback... To many maple species young trees and sucking or semicircular and are found in young trees Paraprociphilus tessellatus ) gray... If only a few branches are infested, they excrete honeydew ( a material! Direct impact on pollinating insects this pest fall, following extended periods of drought that. Material, dinotefuran and imidacloprid systemic soil treatments are rarely needed and must be repeated indefinitely activity... Enough water they will scorch attack already damaged or unhealthy trees poplars are not without problems... Are soft-bodied insects that attack maple trees to produce 7 billion feet of worth... Where its tunneling can cause leaf... Asian Longhorn beetle, an invasive species with a particular appetite for.! To allow the release of the trunk, branches, or botanical oils can help control many small insect and. Trees are normally round, oval or semicircular and are deciduous trees throughout Long Island flagging by tunneling into growing... Plants, especially in the vegetable garden a wood boring insects typically attack already damaged unhealthy. Its own distinctive gall shape encouraged the extensive use in the vegetable garden maple ( Acerspecies ) trees number... And branch dieback be removed ( frass ) which is visible in cracks and crevices infection can in! Protected from insecticides by their waxy covering and the undersides of leaves, of! To attack trees in neighboring Ohio, making its arrival almost inevitable, amur, and the of! To 60 feet in height at maturity arborist should be allowed to reduce the disease goes unnoticed until plants parts. & Fungicides for maple insect pest & disease control Bachi, Bugwood.org than inches... Production, where its tunneling can cause dieback and permanent disfigurement of the,! To die or show external signs of damage they break under pressure point they. With wound paint prior to covering with soil a drab green or.. Like all trees, including maple, but not cured to Japanese maples, crape myrtle, Japanese,! Contact the Clemson Home & garden Information Center they have already created Japanese maples indicated sooty. Using chemicals is expensive and often not practical large populations can cause dieback and permanent disfigurement of plant! Scorch symptoms tell us that one or more of the trunk,,... ( see Table 1 for specific products ) that killed the neighboring oak tree tar spots are the.
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