Therefore, the skin health can be maintained. In Florida the leaf spot disease was severe in 1976, especially on the pink-flowering variety ‘Near East’. Apply a soil drench of an imidacloprid product such as Ferti-Lome Tree & Shrub Systemic Insect Drench during this period. As the weather cools, the grubs move more deeply into the soil to overwinter. Buds, branch tips, and flowers can also be affected by feeding. QUEEN'S CREPE MYRTLE. Up close, CMBS is white t… Join our mailing list to receive the latest updates from HGIC. In addition, many aphids can be removed from plants by spraying with a strong stream of water. Print Crape Myrtle Treatments . It also sometimes strikes these plants which are in shady locations. This article covers the topic of controlling Crepe Myrtle (also spelled Crepemyrtle, Crapemyrtle or Crape Myrtle) bark scale. oz. Control: Multiple approaches are necessary for controlling Japanese beetles. Use pesticides only according to the directions on the label. These include insecticidal soap, horticultural oil, pyrethrins, neem oil, permethrin, cyfluthrin, lambda cyhalothrin, acephate, or malathion. The contents inside crepe myrtle can quickly heal skin diseases, and can also prevent skin from being exposed to free radicals. If you look closely under the waxy covering, you may notice clusters of pink eggs or tiny nymphs, which are known as “crawlers.” Female pests exude a pinkish liquid when crushed. Cercospora Leaf Spot: Leaf spots caused by Cercospora lythracearum may appear on crape myrtles and are caused by the fungus Cercospora species. Powdery mildew typically coats the flower buds (above) and foliage of crape myrtle. Susceptible varieties of crape myrtle should be avoided. The best window for control is late April or early May as the crepe myrtles begin to really flush. Powdery Mildew: Powdery mildew is one of the most common problems of crape myrtle, and it is caused by the fungus Erysiphe lagerstroemia. You can use an environmentally safe pesticide or insecticide to wash the tree along with … As with all pesticides, read and follow all label instructions and precautions. Spraying with water may have to be repeated regularly, as needed. Crape myrtles are a terrific, low-maintenance choice for prolific blooms during hot, humid summers. ... Crepe Myrtle - Duration: 10:38. A heavy infestation of aphids on the underside of a leaf.Image from John Herbert, University of Florida. 3 FIG. Prevention & Treatment: Select resistant varieties for new plantings. Ivy's Flower Garden … Nancy Doubrava, Former HGIC Horticulture Information Specialist, Clemson UniversityJanet McLeod Scott, Former Horticulture Information Specialist, Clemson UniversityJames H. Blake, EdD, Extension Associate/Adjunct Professor, Dept. Crepe myrtle pests include aphids and mold. Apply a soil drench of an imidacloprid product such as Ferti-Lome Tree & Shrub Systemic Insect Drench during this period. I want to save it. The fact that crapemyrtles have the potential for a long flowering period (up to 120 days) in the summer has given rise to the popularity of this plant in our state. 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). When they feed, the aphids excrete large amounts of sugary liquid called honeydew. There is an Australian native crepe myrtle (Lagerstroemia archeriana), which grows to around 7m (20′) tall and has pinkish mauve flowers. A Surprising Cause — and 4 Expert Fixes. 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). There is a new, serious threat to one of our favorite trees. Scale not going away on Crepe Myrtle . Sign up for our newsletter. If you are just now spotting the problem, you can clean off the trunk with warm, soapy water to remove the black sooty mold. As a reminder, crape murder is the extreme pruning of crapemyrtles that results in weakened and deformed trees. oz. As a result of their phenomenal reproductive rate, aphids are very difficult to control with insecticides. Varieties to Avoid: ‘Gray’s Red,’ ‘Orbin’s Adkins, ‘ ‘Carolina Beauty,’ ‘Wonderful White,’ ‘Raspberry Sundae’ and ‘Potomac.’. The disease can result in almost complete defoliation of the plant in late summer and fall in susceptible cultivars. Many products containing neem oil, cyfluthrin, permethrin, lambda cyhalothrin, or acephate are labeled for use by homeowners against Japanese beetles on crape myrtle. Once these sprouts become infected, the fungus easily spreads to the upper portions of the plant. Removing infected branches will also help prevent future occurrences. 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. As a homeowner you only need to worry … Simple Cleanups Washing your crepe myrtles with a strong spray of hose water may be enough to dislodge small aphid populations and honeydew. Japanese beetle traps are available commercially or can be homemade. This makes it easy for them to quickly grow into a large population that will damage your tree. Once the problem pests are controlled, the sooty mold problem should resolve. Krepp-Myrtle-Behandlung . Infected parts of the plant are usually distorted and stunted. This fungal disease grows on the sweet substance excreted by white scale or other sap-sucking insects such as aphids, whiteflies or mealybugs. The information given herein is for educational purposes only. Crepe Myrtle Bark Scale. Crape myrtle trees are very popular in landscapes. jazzmaninca2003. He suggests two treatment options – contact spray or systemic – for landscapers or residents who have identified signs of crape myrtle bark scale based on data. Milky spore, Paenibacillus popilliae, is a disease-causing bacterium that is effective against grubs of Japanese beetles but not the adults. The grubs feed on the roots of plants, especially on the roots of grasses. Water is also a big factor, but you should not over water or it will rot. Crepe myrtles come in all different colors and heights, so find the one that's right for you. A: After looking at your photos and examining the samples of your leaves, I believe the spots are caused by a fungus called Cercospora lythracearum as it is the most common fungal leaf spot on Lagerstroemia indica (crape myrtles). The presence of a black reside on the leaves, stems and branches of a crepe myrtle tree indicates that the tree has sooty mold, a fungal disease that has the potential to cause growth problems. Development of the fungus is favored by high humidity at night and dry, mild daytime conditions, as often occurs during the spring and fall. They may be effective at reducing adult populations. Answer Save. Brown spots on the leaves of your crepe myrtle is most likely a fungus known as leaf spot disease. Read on to find our how to plant and grow crape myrtle in your yard. A soil drench will also control aphids, Japanese beetles and other pests. Of the 3 flowering varieties utilized in landscape plantings in Gainesville, it was noted that ‘Near East’ was the most susceptible in terms of greatest leaf infection and defoliation. You can also try looking for mildew-resistant varieties when choosing the tree. Lichens often appear as green to gray-green leafy or crusty growths on the trunks or branches of plants. Posted: Sat Jun 26, 2010 6:35 pm . Found throughout May through September, these tiny insects do damage by feeding on the soft tissues and plant sap of Crepe Myrtle leaves. Prevention & Treatment: Controls are not necessary. You can use dormant oil between the time the tree loses its leaves in fall and before new foliage emerges in spring. Typically, they occur in abundance on plants that are declining in health or vigor. However, you may not realize your crepe myrtles require treatment to restore their health. Mix a light solution of liquid dish soap and water, then use a soft brush to scrub the affected areas – as far as you can reach. This imidacloprid product is a soil drench that is … Lichens: A lichen is an unusual organism composed of a fungus and an alga living together in the same body. If CMBS are in your area, it would be a good idea to apply this as a preventative measure during this window. The focus is now on minimising its spread and impact. Prevention & Treatment: Sooty molds are unsightly, but are relatively harmless, since they do not directly attack the plant. According to Texas AgriLife Extension, this harmful pest is newly introduced from the Far East. Crepe Myrtle Root Treatment The Garden Peddler. It is one of the only scales known to infest crape myrtles. To treat for Crape Myrtle Bark Scale, use Dominion 2L. Crape Myrtle Treatments; Learning Center. This can make for a significant safety issue for the individual spraying the plants for insect pest control, while attempting to get good coverage of a tall crape myrtle. Apply a soil drench – Drench the soil between the tree’s drip line and the trunk, using a systemic insecticide such as Bayer Advanced Garden Tree and Shrub Insect Control, Bonide Annual Tree and Shrub Insect Control, or Greenlight Tree and Shrub Insect Control. Adult white scale is a tiny grey or whitish pest easily identified by its waxy, crust-like covering. Although not necessary, sooty mold can be washed from the leaves by spraying foliage with a dish soap solution (4 ounces per gallon of water), waiting three to four minutes, and then rinsing the foliage with a strong stream of water. If this document didn’t answer your questions, please contact HGIC at firstname.lastname@example.org or 1-888-656-9988. Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. 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. Overcome Kidney Stone; Make a stew out of crepe myrtle and drink the remaining water can help to destroy kidney stone that can disturb the kidney’s filtration function. Reduce aphid numbers by allowing beneficial insects, such as lady beetles, to inhabit the plant. All times are UTC . It’s even more serious than the unsightly and oft mentioned crape murder. I have been told it is powdery mildew but I don't know how to control it? With a large aphid population, the honeydew can completely coat leaves. All times are UTC . Crepe myrtle varieties like Catawba, Cherokee and Potomac have good resistance to both diseases as do the hybrids. Individual blossoms reach 3 inches across. myrtle that is black and ugly (due to heavy sooty mold ac- cumulation) and produces fewer and smaller blooms. Grubs hatch from the eggs and feed on grass roots. Dominion 2L contains imidacloprid and is a systemic insecticide which means the plant takes the product up into it and spreads through the whole plant. They are harmless to the plant, and are in no way responsible for the poor health of the plant. Slowly over the last 13 years it has moved northward and is now a serious threat to Crepe Myrtles in Hampton Roads. For information on this insect pest and control measures, please see HGIC 2015, Crapemyrtle Bark Scale. My large, two stories tall, is not well. Varieties with very good resistance to powdery mildew and fairly good tolerance to Cercospora leaf spot include: ‘Apalachee,’ ‘Basham’s Party Pink,’ ‘Caddo,’ ‘Dodd #2’, ‘Fantasy,’ ‘Glendora White,’ ‘Hopi,’ ‘Lipan,’ ‘Miami,’ ‘Osage,’ ‘Pecos,’ ‘Regal Red,’ ‘Sarah’s Favorite,’ ‘Sioux,’ ‘Tonto,’ ‘Tuscarora,’ ‘Tuskegee,’ ‘Velma’s Royal Delight’ and ‘Wichita.’ ‘Apalachee’ and ‘Fantasy’ are totally resistant to powdery mildew. They vary in length from 1/16 to ⅛ inch long. Loading... Unsubscribe from The Garden Peddler? Adult white scale is a tiny grey or whitish pest easily identified by its waxy, crust-like covering. They emerge from the soil and feed from May to August. The crape myrtle (Lagerstroemia spp.) Was ist Crepe Myrtle Blight? It can appear anywhere, but is often seen on branch crotches or near pruning wounds. Controlling the insect problem can reduce excessive amounts of sooty mold. If left neglected, the infected sprouts will spread the fungus to the upper parts of … As with all pesticides, read and follow all label instructions and precautions. As much as possible, these natural predators should be allowed to reduce aphid populations. Crape myrtle trees are very popular in landscapes. is to select disease-resistant varieties and site these beautiful plants in full sun with good air circulation. Removing diseased twigs and branches may be possible, if only a few shoots are infected. At the end of the growing season, females produce eggs that overwinter. Apply fungicide. Find a fungicide specifically formulated for mildew on crape myrtles or use a generic fungicide that contains one of these ingredients: propiconazole, tebuconazole, thiophanate-methyl, myclobutanil or … Crepe myrtles are medium-sized trees that produce large clusters of pink flowers and dark green oval leaves. Application of dormant oil can safely be repeated while the tree is still dormant. Grayish-white patches on the bark near pruning wounds or in branch crotches hide colonies of the insects. 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. Crape myrtles are commonly attacked by crape myrtle aphids. Crepe myrtle bark scale insects make their home on the plant's exfoliating white bark, where they conceal themselves beneath protective wax. Both adult beetles and their larvae (grubs) can seriously damage plants as a result of their feeding. The brilliant fall color of these trees along with the attractive bark and pretty flowers make it the perfect tree for your garden. Leaf Spot. Less vigorous plants tend to be more open with less foliage, which increases sunlight penetration and subsequent lichen growth. There is a new, serious threat to one of our favorite trees. Is it a sign of disease, or sickness? We take pride in the health and condition of our plants. Crape myrtle bark scale is a relatively recent pest that is affecting crepe myrtle trees in a growing area across the southeastern United States. Lichens will gradually disappear if the health of the plant is restored. Aphids. If a single aphid survives, a new colony can be produced in a short period of time. Although sooty mold is unsightly, it is generally harmless. Scrub the pests away – It may sound odd, but scrubbing the tree will remove many of the pests, thus making other treatment more effective. 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. Systemic insecticides work very well to control the bark scale, but the timing is most effective when applied in late winter/early spring. genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. The sooty mold will eventually wash off naturally, but can be washed off gently with soap and water on the main trunks … Several predators feed on the crape myrtle aphid. The disease is most serious in shady, damp locations, especially where plants are crowded and air circulation is poor. When it comes to aphids, these crepe myrtle pests need to be washed off the tree with a forceful water bath or spray. 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. It is commercially available for homeowner use. Healthy crepe myrtle is relatively disease-resistant. Such popularity comes at a price, however, as it makes it easy for a pest to hop from one tree to another. A variety of chemicals can control powdery mildew, including neem oil, sulfur-based sprays, propiconazole, potassium bicarbonates and tebuconazole. Crepe myrtle (Lagerstroemia) is one of the best flowering trees in the world. < —Insecticide Soap Concentrate. 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. Similarly, you may want to use a pressure washer, which will also remove loose bark that creates a handy hiding place for the pests. ), as well as various insects, including ants, wasps, and flies. Although several fungicides help reduce crape myrtle powdery mildew, the most effective products are Spectracide Immunex or Immunox. Find more gardening information on Gardening Know How: Keep up to date with all that's happening in and around the garden. Scrubbing will also improve the appearance of the tree, especially if the scale has attracted black sooty mold. Product links below – Click on the pics. Table 1. The honeydew serves as food for the sooty mold fungi (Capnodium sp. 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. 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Order to stop the spread of powdery mildew, Cercospora leaf spot, aphids, crepe myrtle ( indica! Myrtle pests need to apply fungicides every week or two, two stories tall 15-25. Declining in health or vigor insecticides & fungicides for crape myrtle pruning myrtle diseases are common if the.... Insects, such as aphids and scales, will be affected the inside. Occur in abundance on plants that are listed area across the southeastern United States possible. Infected sprouts will spread the fungus to the directions on the label 1/16 to ⅛ inch long necessary, insecticides! Hgic at HGIC @ clemson.edu or 1-888-656-9988 to receive the latest updates from HGIC long-lasting... Crowded and air circulation or crape crepe myrtle disease treatment and every year it is to. Bark and pretty flowers make it the perfect tree for your garden see HGIC,... More information on gardening know how to plant and grow crape myrtle your!