Wood-boring insects often produce sawdust-like frass (excrement). They feed on sap by piercing the leaf, stem, or branch with their mouthparts and sucking. The late frost, coupled with what seems like an increase in sucking insects are really stressing out the trees. Md, College Pk, Bugwood.org, James Solomon, USDA Forest Service, Bugwood.org, Steve Mayer, Extension Educator-Horticulture, B.L. This disease is more common in the forest, but may be seen in some landscape situations. Emerald ash borer (Agrillus planipennis) adults are distinctive dark metallic green beetles that are about 1/2 long and about 1/8 inch wide. As they feed on plant sap, they excrete honeydew (a sugary material). Thoroughly wet the bark. Treat when aphids appear and repeat at seven- to 10-day intervals, if needed. insects that attack maple trees. Eggs masses are conspicuously white and cottony in appearance. This disease is most severe during wet weather. Extensive tree-killing can deplete timber supplies, adversely affect levels and distributions of tree stocking, disrupt management planning and operations, and increase forest fire danger by adding to available fuels. 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. Greenstriped mapleworms, Dryocampa rubicunda, feed on maple trees in summer. for Aphids, College of Agriculture, Forestry and Life Sciences, Centipedegrass Yearly Maintenance Program, Ferti-lome Broad Spectrum Insecticide Concentrate, Bayer Advanced Vegetable & Garden Insect Spray Concentrate; & RTS, Ortho Tree & Shrub Insect Control Ready to Use Granules, Bayer Bio Advanced 12 Month Tree & Shrub Insect Control Landscape Formula, Spectracide Triazicide Insect Killer for Lawn & Landscapes Concentrate, Bonide Neem Oil Fungicide, Miticide, Insecticide Concentrate, Bonide Eight Insect Control Vegetable Fruit & Flower Concentrate, Cleary’s 3336-WP Turf & Ornamental Fungicide. Leaves and buds may turn brown and die, followed by twig and branch dieback. As with all pesticides, read and follow all label instructions and precautions. 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. 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. Read and follow all directions on the label. document.write(year) An Equal Opportunity University | Physiological leaf scorch is the most common. The larvae feed on the inner bark of ash trees from June through October, disrupting the tree's ability to transport water and nutrients. Spindle galls, however, are usually indicative of mites. Wood-boring insects that attack healthy trees and shrubs are called “primary invaders.” Primary On the leaves, spots appear with pale yellow centers and purple borders. Physiological leaf scorch is the most common. One woodp… These predators should be allowed to reduce aphid populations as much as possible. Often the distinctive shape allows for identification of the pest. If it is an exotic insect like Asian Longhorned Beetle, the proper authorities need to know so they can try to prevent them from spreading. Cottony maple leaf scale adults (Pulvinaria acericola) (Walsh and Riley, 1868).Nancy Gregory, University of Delaware. When homeowners see these growths on the leaves of their maples, they often become quite concerned. Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. 3Insecticidal soap should not be applied to Japanese maples. Male scales are tiny, winged insects. For more information, contact the Clemson Home & Garden Information Center. If soil applied insecticides are used, make applications immediately after flowering to reduce the amount of insecticide exposure to pollinating insects. Read and follow all directions on the label. Chemical treatments are rarely needed and must be repeated indefinitely. They are easy to spot on the stems of trees with dark bark. As a result of the honeydew, sidewalks and cars become sticky. Colonies of these pests are obvious because of their white, fuzzy appearance. Citrus Thrips are tiny orange, yellow, or even black insects that can attack trees at any age. Also, they stop the sap from flowing properly within the tree. Overwintering immature scales (nymphs) are about 2 mm long, gray, and are usually found in twig forks. Charlotte Gerber (author) from upstate New York on June 11, 2010: Hi Jeremy, Maples have had a really tough year, and many had it rough last year as well. Pests such as caterpillars, beetles, slugs and other large pests can be easily removed by hand when infestations are low. Some are flat and appear like scales stuck to a plant, while others appear like white cottony masses. Insects Attacking Trees. Rake up and discard the leaves in fall. Scorching due to dry soil may be overcome by proper watering. Occasionally, it is found on red maple. Both narrow- and broadleaf evergreens are vulnerable to insect attack, sometimes just to an unsightly degree, and sometimes to the point of fatality. Fertilization of the tree after root removal will aid in recovery. They are also found throughout the Eastern United States. Read and follow all directions on the label. Scale insects are a sucking insect that extract plant sap from the host plant. 1Acephate may damage red and sugar maples. 4Malathion may cause slight injury to many maple species. Both are non-native pests. Table 1. Spots arise in late spring or early summer after leaves attain full size. The spots are irregularly round and ¼ inch in diameter. ), or botanical oils can help control many small insect pests and mites that affect garden and landscape plants. They prefer feeding on new growth in such areas as shoots, buds, and the undersides of leaves. This scale primarily attacks azalea and rhododendron but has also been found on andromeda, maple, arborvitae, willow, poplar, and hackberry. If spraying is required, always spray late in the evening to reduce the direct impact on pollinating insects. Dead branches on spruce and fir trees may indicate a budworm outbreak. For example, sprays with insecticidal soap, horticultural oil, neem oil extract, spinosad, Bacillus thuringiensis (B.t. Scorch symptoms are light brown or tan dead areas between leaf veins or around the leaf margins. Thrips attack young leaves and juvenile fruit and feed on the citrus tree sap. 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. Other chewing insects attack the fruit. It is caused by dry w… But those insects didn't cause the damage; they are just taking advantage of the cool, dark, moist environment of the dead tissue under the bark. 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. .G.Keith Douce, University of Georgia, Bugwwod.org. Protective sprays on other susceptible plants may reduce their spread. Follow all directions, precautions and restrictions that are listed. Mites aren't usually a problem for trees, but both beetles and moths can strip the foliage right off a maple tree. 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. University of Kentucky College of Agriculture | Gypsy Moth: The exotic gypsy moth is one of the "most notorious pests of hardwood trees in the Eastern United States." The sooty mold fungus grows on the honeydew, resulting in unsightly, dark fungal growth. Severe infection can result in partial defoliation of the tree. Scales are unusual insects in appearance. Galls vary greatly in appearance, from wart-like bumps to spindle-shaped protrusions to felt-like patches on the leaf’s surface. Boxelder bugs congregate in large numbers on the bark of trees and feed, often causing new leaves to grow in abnormal shapes or preventing them from growing fully. Unless protected, infested trees usually die within 4 to 7 years of attack. 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). Aphids: Aphids are soft-bodied insects that range from 1/16 to ⅜ inch long. Symptoms often start out as a marginal chlorosis or yellowing of the leaves before they fade to a drab green or brown color. 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. Professional arborists have studied for many years the typical insects that attack specific types of trees. Stress within the water conducting vessels realize you have a problem for,!, the homeowner can handpick and destroy insects that attack maple trees before they fade to a green. Feed by piercing plant tissue and sucking plant sap, they may girdle trees or weaken to... Resistant to leaf spot see all the small bugs underneath the loose bark Makers: often! 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