Want to see more Southern Living videos? Systemic insecticides work very well to control the bark scale, but the timing is most effective when applied in late winter/early spring. Crape myrtle disease . Scale not going away on Crepe Myrtle . As a result of their phenomenal reproductive rate, aphids are very difficult to control with insecticides. The leaves are orange and sparse forthe second year in a row. In addition to crape myrtle, it will feed on nearly three hundred different plant species. Japanese Beetle. You can use an environmentally safe pesticide or insecticide to wash the tree along with … Grayish-white patches on the bark near pruning wounds or in branch crotches hide colonies of the insects. Pruning depends on the desired size and shape of the tree. Repeat applications every 2-3 weeks or as needed, and always read label and instructions before using any control. More information on successfully growing crape myrtles is available in HGIC 1008, Crape Myrtle, and HGIC 1009, Crape Myrtle Pruning. Japanese Beetles: Adult Japanese beetles are about ½ inch in length and coppery-brown in color with metallic green heads. If your crape myrtle's dark green leaves have turned white, your tree might be infected with mildew. By: Mary H. Dyer, Credentialed Garden Writer. The scales also reproduce on the shrubs, with each female laying dozens of pink eggs. Crepe Myrtle Bark Scale (or CMBS) is relatively easy to identify in heavy infestations, but can be difficult to notice in its early stages on Crepe Myrtles. Crepe myrtles come in all different colors and heights, so find the one that's right for you. Crape myrtle bark scale is a relatively recent pest that is affecting crepe myrtle trees in a growing area across the southeastern United States. Spray the tree with a dormant oil – Apply dormant oil generously, using enough oil to reach cracks and crevices in the bark. They are harmless to the plant, and are in no way responsible for the poor health of the plant. What you've described sounds like the disease called: POWDERY MILDEW. Green Stuff on Crepe Myrtle Bark. Soil drenches of imidacloprid in the spring will control aphids and last longer within the plant to prevent future infestations by aphids and other insect pests (see Table 1 for specific products). It’s even more serious than the unsightly and oft mentioned crape murder. Keep traps at least 50 feet from the crape myrtle tree or you may create more of a problem by attracting them to the area. 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. Adult females are felt-like white or gray encrustations that stick to crape myrtle parts ranging from small twigs to large trunks. You walk out to your crepe myrtles and you see that the leaves look black. The fungal plant disease myrtle rust is an established disease in Victoria and can't be eradicated. This fungal disease is a serious problem on crape myrtles from Maryland to Florida and out to Texas and in the North on trees planted near the seashore or other cool, foggy areas. Image from John Herbert, University of Florida, These harmless lichens are growing on an older crape myrtle.Karen Russ, ©2007 HGIC, Clemson Extension. Crepe Myrtle Bark Scale. Spraying with water may have to be repeated regularly, as needed. Crape myrtles (Lagerstroemia indica) are essentially trouble-free small trees. Posted: Sat Jun 26, 2010 6:35 pm . There is a new, serious threat to one of our favorite trees. All of these are safe, natural products available at home and garden centers. Crape Myrtle. Crepe Myrtle Root Treatment The Garden Peddler. Therefore, the skin health can be maintained. We also recommendPivot 10. Cercospora Leaf Spot: Leaf spots caused by Cercospora lythracearum may appear on crape myrtles and are caused by the fungus Cercospora species. This is an insect growth regulator that can kill ins… Board index » Natural Organic Management and Techniques » Pests & Disease Control Forum. The disease is most serious in shady, damp locations, especially where plants … Also, honeydew production from the bark scale on the leaves which may begin dripping sap down off the leaves. If disease is severe enough to warrant using chemicals for control, thiophanate-methyl or myclobutanil as used for powdery mildew will control Cercospora leaf spot (see Table 1 for specific products). The best window for control is late April or early May as the crepe myrtles begin to really flush. Slowly over the last 13 years it has moved northward and is now a serious threat to Crepe Myrtles in Hampton Roads. It is one of the only scales known to infest crape myrtles. ... Crepe Myrtle - Duration: 10:38. Sooty mold completely covers these crape myrtle leaves. Several predators feed on the crape myrtle aphid. Effective treat-ments are available, but they are relatively costly and do not provide 100 percent control, meaning that treatments must be reapplied each year. If you live in the Mid-South, you most likely have a crepe myrtle in your yard or certainly in your neighborhood. As with all pesticides, read and follow all label instructions and precautions. Have confidence that any plants you order from us are ALWAYS disease and insect free. Varieties to Avoid: ‘Gray’s Red,’ ‘Orbin’s Adkins, ‘ ‘Carolina Beauty,’ ‘Wonderful White,’ ‘Raspberry Sundae’ and ‘Potomac.’. When it comes to aphids, these crepe myrtle pests need to be washed off the tree with a forceful water bath or spray. Control: Multiple approaches are necessary for controlling Japanese beetles. Page 1 of 1 [ 8 posts ] Previous topic | Next topic : Author Message; charmon711 Post subject: Scale not going away on Crepe Myrtle. Product links below – Click on the pics. In addition, using insecticides means that beneficial predators will also be killed. Since 2013, in the city of Germantown, there has been a suspicious decrease in the health and appearance of one of the South’s ubiquitous flowering tree species, the crepe myrtle. Shorten excessively long outer branches. The disease can result in almost complete defoliation of the plant in late summer and fall in susceptible cultivars. Favorite Answer. myrtle that is black and ugly (due to heavy sooty mold ac- cumulation) and produces fewer and smaller blooms. Relevance. Apply Immunex (1 ½ fl. This makes it easy for them to quickly grow into a large population that will damage your tree. If a single aphid survives, a new colony can be produced in a short period of time. Similarly, you may want to use a pressure washer, which will also remove loose bark that creates a handy hiding place for the pests. This often leads to a black fungus, called sooty mold, forming on leaves and branches in mid- to late summer. This will reduce moisture that could lead to fungus. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 2002 | Updated: Nov 11, 2019 | Print | Download (PDF). The grubs feed on the roots of plants, especially on the roots of grasses. This crepe tree boasts striking beautiful summer flowers, extremely beautiful fall foliage and is a totally good drought resistant tree. If your crepe myrtle is affected by white scale, it may develop black sooty mold (In fact, the sooty, black substance may be the first sign of white scale on crepe myrtles.). Crepe myrtle aphids reproduce rapidly. Removing infected branches will also help prevent future occurrences. Although sooty mold is unsightly, it is generally harmless. Kingwood Garden Center customer, Ronny R, stopped by to find a solution for the unsightly residue on his crepe myrtle trees, which he believed to a fungus. If left neglected, the infected sprouts will spread the fungus to the upper parts of … genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. Some of the problems CMBS brings about are the limiting of blooms; you’ll see a little bit of reduction in the blooms. The brilliant fall color of these trees along with the attractive bark and pretty flowers make it the perfect tree for your garden. In South Carolina, the most important insect pest is the crape myrtle aphid (Sarucallis kahawaluokalani), which is found on the leaves and twigs of crape myrtle. You have 50 words left! As much as possible, these natural predators should be allowed to reduce aphid populations. Otherwise, prune sparingly to maintain the tree's natural shape. As the weather cools, the grubs move more deeply into the soil to overwinter. Although several fungicides help reduce crape myrtle powdery mildew, the most effective products are Spectracide Immunex or Immunox. The focus is now on minimising its spread and impact. Their feeding on young leaves often causes leaf distortion. Prevention & Treatment: The most effective control measures include locating plants in full sun, removing sprouts from the base of the plant and planting resistant varieties. There is an Australian native crepe myrtle (Lagerstroemia archeriana), which grows to around 7m (20′) tall and has pinkish mauve flowers. Krepp-Myrtle-Behandlung . My large, two stories tall, is not well. If you are just now spotting the problem, you can clean off the trunk with warm, soapy water to remove the black sooty mold. is to select disease-resistant varieties and site these beautiful plants in full sun with good air circulation. < —Insecticide Soap Concentrate. Sooty mold indicates that there is an insect problem on the plant. Japanese beetle (Popillia japonica) is also a pest and feeds on both leaves and flowers. Plant sap has a high sugar content. In Florida the leaf spot disease was severe in 1976, especially on the pink-flowering variety ‘Near East’. A variety of chemicals can control powdery mildew, including neem oil, sulfur-based sprays, propiconazole, potassium bicarbonates and tebuconazole. Copyright © 2020 Clemson UniversityClemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | Contact UsHGIC@clemson.edu, College of Agriculture, Forestry and Life Sciences, Centipedegrass Yearly Maintenance Program, Bonide Systemic Insect Control Concentrate, Bayer Advanced Vegetable & Garden Insect Spray Concentrate, Bayer BioAdvanced 12 Month Tree & Shrub Insect Control, Bonide Multi-Purpose Insect Control Soap Concentrate, Martin’s Cyonara Lawn & Garden Concentrate; & RTS, Bonide Malathion 50% Insect Control Concentrate, Gabriel Laboratories Milky Spore Powder; or Granular, Spectracide Immunox Multi-Purpose Fungicide Concentrate, Ferti-lome Triple Action Plus: Neem Oil Concentrate (w/ pyrethrins), Bonide Eight Insect Control Vegetable Fruit & Flower Concentrate, Cleary’s 3336-WP Turf & Ornamental Fungicide. They come in a profusion of sizes—from dwarf to towering trees—and in colors ranging from snow white to deep purples and reds. Board index » Natural Organic Management and Techniques » Pests & Disease Control Forum. With approximately 50 species, this tree is cultivated in warmer climates, and is indigenous to Southeast Asia, the Indian subcontinent, and northern parts of Australia. Scrubbing will also improve the appearance of the tree, especially if the scale has attracted black sooty mold. Typically, they occur in abundance on plants that are declining in health or vigor. Multiple applications may be required. Reference to commercial products or trade names is made with the understanding that no discrimination is intended and no endorsement by the Texas AgriLife Extension Service is implied. I have been told it is powdery mildew but I don't know how to control it? Aphids. Crape myrtles are a terrific, low-maintenance choice for prolific blooms during hot, humid summers. And if so, what should I do to treat it? Large leaves (8-12 inches long, 4 inches wide) turn red in fall. ), as well as various insects, including ants, wasps, and flies. Crepe myrtle aphids reproduce rapidly. Spray your crepe myrtle according to label directions with insecticidal soap, horticultural oil, neem oil, or Natria Multi-Insect Control. If CMBS are in your area, it would be a good idea to apply this as a preventative measure during this window. 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. Once these sprouts become infected, the fungus easily spreads to the upper portions of the plant. The crape myrtle (Lagerstroemia spp.) The information given herein is for educational purposes only. Crepe myrtle (Lagerstroemia) is one of the best flowering trees in the world. Many products containing neem oil, cyfluthrin, permethrin, lambda cyhalothrin, or acephate are labeled for use by homeowners against Japanese beetles on crape myrtle. Aphids are bothersome little insects that eat Crape Myrtle leaves. Apply fungicide. All times are UTC . 1 decade ago. oz. You can use dormant oil between the time the tree loses its leaves in fall and before new foliage emerges in spring. In addition, many aphids can be removed from plants by spraying with a strong stream of water. Crape Myrtle Aphids: Crape myrtle aphids are pale yellowish green in color with black spots on the abdomen. Q: I have a crape myrtle and every year it is covered in a whitish powder. Sign up to get all the latest gardening tips! Apply a soil drench of an imidacloprid product such as Ferti-Lome Tree & Shrub Systemic Insect Drench during this period. per gallon of water every 14 days) until disease control is obtained. Adult white scale is a tiny grey or whitish pest easily identified by its waxy, crust-like covering. As the aphid feeds, it injects saliva into the leaf. Like the aphids, crepe myrtle scales drain sap, excrete honeydew and lure sooty mold. The honeydew serves as food for the sooty mold fungi (Capnodium sp. The amount of resistance may vary from location to location and may depend on particular environmental conditions. White-to-grayish moldy growth develops on leaves and new shoots. Answer Save. Adults can be handpicked and drowned in a pail of soapy water. Infected parts of the plant are usually distorted and stunted. According to Texas AgriLife Extension, this harmful pest is newly introduced from the Far East. Heavily infested trees need fungicide for treatment. QUEEN'S CREPE MYRTLE. Treatments that have proven most effective in states where CMBS is already established are soil-applied systemic insecticides containing the active ingredients imidacloprid, imidacloprid + clothianidin, dinotefuran, or thiamethoxam. It is commercially available for homeowner use. Read on to find our how to plant and grow crape myrtle in your yard. Adult Japanese beetles eat flowers and skeletonize leaves (eat leaf tissue between the veins, resulting in a lacy skeleton remaining). jazzmaninca2003. No mowing takes place sonow physical damage I can think of. Crepe myrtle pests include aphids and mold. Very few insects are pests of crape myrtle. Asked June 19, 2017, 9:25 AM EDT. This makes it easy for them to quickly grow into a large population that will damage your tree. Heavily infected flowers may fail to open. James Blake, ©2007 HGIC, Clemson Extension. Crape myrtle bark scale is relatively easy to identify. I want to save it. 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