Once the mated females produce their ovisacs (egg-containing capsules) and lay eggs, they die. It is used frequently in southern gardens because the hot summer climate allows it to thrive. Crape myrtles are a very hardy trees with lots of reserves, so it would take several seasons of bark scale for the tree to succumb to this pest. However, if you don't happen to have a large supply of Lady Bugs on hand, you can spray your Crape Myrtle with over the counter diazinon or malathion, available at most home improvement stores. … Aphids are bothersome little insects that eat Crape Myrtle leaves. Handy conversions: ½ fl oz = 1 Tbsp and 1 fl oz = 2 Tbsp. It can completely cover and severely damage new plant growth. ... Be sure to direct spray inside any cracks or crevices inside the trunk. Up close, CMBS is white t… For both diseases, if conditions favoring disease development (hot, moist weather) exist, reapply every seven to 10 days. However, the Crape Myrtle does boast a higher resistance to pests and diseases than other flowering tree varieties, and when they are affected, the issues are easy to mediate quickly. As with aphids, treating crape myrtles for the pests is the best way to eradicate sooty mold. 5) Watch for Crape Myrtle Asian Bark Scale, it turns the trunks completely black … On new growth and in heavy infestations, the scales may be distributed more uniformly on the branch (Figs. **Includes use on the following members of the cucurbits group: It is a violation of Federal law to use this product in a manner inconsistent with its labeling. Rinse the trunk after scrubbing it. Crape myrtles need plenty of sun and air circulation to help fight this disease. If Black spot is not a problem, a 10- to 14-day schedule is recommended. Do not apply within 14 days of harvest. A group of roundish, slow-moving scale insects looks so much like a lumpy growth that gardeners often mistake scales for a plant disease. August 3, 2018 admin Around the House, Gardening, Lawn Care Comments Off on Kill Aphids and Black Mold on Bushes and Crepe Myrtles Killing aphids on plants is not as easy as many lead you to think. Thanks. A dormant oil spray can also be effective at controlling scales on woody ornamentals such as crape myrtles. You should begin to see results immediately. Spectracide Immunox Multi-Purpose Fungicide Spray Concentrate for Gardens is highly effective when it is used to prevent diseases or applied at the first sign of disease. Tags: ants aphids crape myrtle crepe myrtle drooping leaves honeydew lacewing ladybugs sooty mold yellow spots on leaves. Crape myrtle trees are very popular in landscapes. 3) Plant the hybrids with the large leaves to avoid powdery mildew in the spring and fall. 2), infected shoots may dry up and shrivel, severely affected buds will drop off (Fig. ®/TM/© 2020 Spectrum Brands, Inc. or one of its affiliates. Sonny from the westside of Houston wrote to us wondering how to handle a tree covered in ball moss. Reapply every 21 days so long as disease symptoms persist. It is one of the only scales known to infest crape myrtles. Add 3 teaspoons of mild dish soap to 1 gallon plain water. I had it last year, but it's worse this time. But it is possible for unsightly growth to take over the trunk of the tree itself. Using a garden hose sprayer, coat the leaves thoroughly, especially lower leaves. Older leaves are less likely to be affected, but can become infected under conditions favorable for the disease. Initially, the infection begins as sporadic, circular, and powdery white spots. As summer approaches, it is not unusual for crape myrtles' lush green growth to turn black as they are covered in sooty mold. Spray on a clear day with little or no wind and temperatures between 40 and 70 degrees Fahrenheit in spring. Soon, the powdery mildew … Consider treating early in the season. So we decided to ask our expert on everything that grows….Mary from RCW Nurseries. Cercospora Leaf Spot. I have a crepe myrtle tree infested with ball moss, how can I treat and kill the ball moss? The crape myrtle (Lagerstroemia spp.) Powdery mildew occurs most often on young, actively growing plant tissues (Fig. The weird, white stuff is a fungus called powdery mildew.Its spores are everywhere, but they don't germinate unless the conditions are right. How to Care for a Inaba-Shidare Japanese Maple Tree, University of California IPM: Crape Myrtle. *Includes use on the following members of the caneberry group including varieties and/or hybrids: Grapes (Anthracnose, Black rot and Powdery mildew control): Mix 1¼ fl oz of this product with 1 gal of water and uniformly apply to all parts of the plant to point of runoff. When treating irises, increase use rate to 2 fl oz/gallon of water. If you need more information about lawn, ornamental, fruit and vegetable diseases, contact your local County Extension Service. I also have it on a Knockout rose bush. Do not use treated plants, grass or clippings for food or feed. Once the fungal growth has reach this stage, cutting down the tree may be the best option, especially if the crape myrtle is large and presents a danger to people or structures. Answer: Scale on crape myrtles has become a common problem the last few years. You can remove sooty mold and honeydew with a soap spray and soft brush, but to keep it from returning, you'll need to control the insects that leave the honeydew. Crape Myrtle. This can be a difficult pest to control and it may take m… genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. How to Remove Black Sooty Mold. Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. This is done by mixing a mild soap and water solution and spraying your tree or shrub down. If your crape myrtle's dark green leaves have turned white, your tree might be infected with mildew. The surface of an infected plant has a powder-like appearance (Fig. For heavily infested trees, clean the trunks and reachable limbs with a … 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.). This product may be applied up to and including the day of harvest. CMBS might be able to overwinter in the adult female and egg life stages, and crawlers and later stage nymphs have been observed overwintering under the loose bark and in cracks and crevices of crapemyrtles in our area. Food utensils such as measuring cups and spoons must not be used for food purposes after use in measuring pesticides. Apply fungicide. Spectracide Immunox® Multi-Purpose Fungicide Spray Concentrate for Gardens is highly effective when it is used to prevent diseases or applied at the first sign of disease. They are usually one of the last trees to put on leaves in the spring, but earlier than pecans. Wash hands with soap and water promptly after use and after contact with treated plants on day of application. The small CMBS males are winged and will fly to find females and to mate. Tree fungus is an unsightly tree condition that causes discolorations, abnormal growth patterns and abscesses on certain trees. Crape myrtles are commonly attacked by crape myrtle aphids. As with most insects, there are several life stages and the appearance of CMBS changes with the stages. Peppermint and spearmint (Powdery mildew and Rust control): Mix 1¼ fl oz of this product with 1 gal of water and uniformly apply to all parts of the plant to point of runoff. Azalea (2), mountain laurel (2), rhododendron (2), Abelia, acalypha (copper-leaf), catalpa, flowering cherry, hackberry, honeysuckle, privet, trumpet creeper, zinnia, Ageratum, anemone, angelica, ash, aster, birch, China aster, chokeberry, chrysanthemum, columbine, cornflower, dianthus, flowering quince, flowering maple (abutilon), four o'clock, fuchsia, iris (3), marigold, moonflower, ninebark, Russian olive, smoke-tree (gothus), Achillea (yarrow), alder, amelanchier (juneberry, shadbush), barberry, carnation, delphinium, gaillardia, gardenia, geranium, hollyhock, mock orange, pansy, petunia, photinia, salvia, snapdragon, viburnum, African violet, begonia, bittersweet, buckeye, California poppy, chestnut (horse), cosmos, crepe myrtle, dahlia, elm, euonymus, gourd (ornamental), grape leaf ivy, lilac, locust, maple, oak, poinsettia, spirea, sycamore, walnut, willow, Flowering crabapple, flowering pear, hawthorn, Cures and prevents all major diseases on roses, lawns, flowers, trees and ornamental shrubs, Controls brown patch, powdery mildew, black spot, rust, blights, leaf spot, mold, scab and more. Like all trees, Crape Myrtles can develop fungus or mildew on their leaves. Apply in the early spring when the plants have broken dormancy. Crape Myrtles (Lagerstroemia) are very popular shrubs for warmer areas, and no wonder.They have spectacular blooms for an extended period, grow well in poor soil, and are heat and drought resistant. - Dolores L. This is not a fungus. Heavily infected flowers may fail to open. You can kill tree fungus by dousing the affected area with a solution of Clorox bleach and water. For all berries, this product may be applied up to the day of harvest. When it comes to aphids, these crepe myrtle pests need to be washed off the tree with a forceful water bath or spray. When crushed with a finger, it will ooze out a pink substance. Coat the base of the tree and everywhere else scales congregate. Washing your crepe myrtles with a strong spray of hose water may be enough to dislodge small aphid populations and honeydew. Photo: Steve Bender/em. Do not apply more than three times per season. For Anthracnose and Black rot, apply when new shoots are 1 to 3 inches in length. The spores and mycelia of powdery mildew are sensitive to extremes of heat and sunlight. Mix only enough Bordeaux mixture to use in one session. The crape myrtle (Lagerstroemia spp.) Most often, mold problems, such as powdery mildew, associated with crape myrtle can be found primarily on its leaves, as can fungal spot. Leaf fungus isn't pretty, but it won't kill your crape myrtles and spraying doesn't help ... it is too late to spray. The disease is most serious in shady, damp locations, especially where plants … This is a plant-like organism called lichens. Saturate the areas of the crape myrtle covered by lichen. Fortunately, the common Lady Bug can eat up to 1,000 of these little critters a day! This often leads to a black fungus, called sooty mold, forming on leaves and branches in mid- to late summer. For lawn application in Nassau and Suffolk counties in New York State, do not apply more than three times per given area per year. I have 2 crape myrtle trees and there's a mossy green scale on the branches. This fungal disease grows on the sweet substance excreted by white scale or other sap … The most likely suspects are various fungal spores. You walk out to your crepe myrtles and you see that the leaves look black. 4) Crape Myrtles need at least 6 hours of DIRECT SUN for good, long summer bloom. It causes white or grayish powdery coat on the leaves. A&M has identified this pest as Eriococcus lagerstroemiae, and suspects that it was brought into the U.S. on a crape myrtle plant. Do not apply more than five times per season. When crushed, these scales exude pink “blood”-like liquid. Reapply every 21 days so long as disease symptoms persist. Sooty mold looks much like it sounds -- as if black ashes had been rubbed over part of a plant. If you have aphids on crepe myrtles book a consultation with an arborist using our online form or by calling 703.573.3029. emCercospora leaf spot. Reapply every 14 days so long as disease symptoms persist. Apply when the disease first appears or if conditions favoring disease development (hot, moist weather) exist. Kind of like cleaning a greasy pot. BITE BACK: Mosquitoes remain a concern. See table for a complete list of plants. In addition to the presence of these bumps there is often also an emergence of unsightly black sooty-looking mold which develops resembling black dust on the leaves and bark of the crape myrtle plant.These are the defining characteristics which make up crape myrtle ba… Consider treating early in the season. Begin treating in early spring and continue treating every two to three weeks until threat of infection has passed. As the infection spreads, these tiny spots become larger. Powdery Mildew: Powdery mildew is one of the most common problems of crape myrtle, and it is caused by the fungus Erysiphe lagerstroemia. They fill the bill of being a small, summer-flowering, deciduous tree. Its host is honeydew, a substance excreted by aphids and some other insects. genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. Or kill the aphids with a homemade insecticide coat. Crape myrtle bark scale will appear like a white waxy crusty dot found on the tree trunk, branches or bark. Tomato (Powdery mildew control): Mix 1 fl oz of Spectracide Immunox Multi-Purpose Fungicide Spray Concentrate for Gardens with 1 gal of water and uniformly apply to all parts of the plant to point of runoff. Each female lays about 60 to 250 eggs, which may over-winter within their ovisacs, and then hatch during mid- to late Apri… Ellen Douglas has written on food, gardening, education and the arts since 1992. If you want to grow crepe myrtles as trees, low shrubs or container plants, you should know about all the common diseases and pests that can plague these plants. Do not plant a new crop in the same place as the crop that was treated within 30 days of the last application. In one year, there could be at least two generations of CMBS. NOTE: This product is non-staining to most home siding depending on age and cleanliness. Tomato (Powdery mildew control): Mix 1 fl oz of Spectracide Immunox Multi-Purpose Fungicide Spray Concentrate for Gardens with 1 gal of water and uniformly apply to all parts of the plant to point of runoff. Most crepe myrtle disease is caused by pests. Texas A & M Agrilife Extension: Crape Myrtle Scale: New pest for US? Bark scale originates from China and was brought to the U.S. in 2010. Cercospora is a leaf spot … She received her Bachelor of Arts from the University of Connecticut. 4 through 6). For this reason, sooty mold will often feel sticky. University of California IPM: Scale Management, Missouri Botanical Garden: Lagerstroemia 'Acoma', The United States National Arboretum: Crape Myrtle Questions, How to Get Rid of Scales on Japanese Maples, How to Diagnose Cedar Tree Pests & Diseases. And that's what crepe murderers have helped to do this year. The crepe myrtle, sometimes spelled crape myrtle or crapemyrtle, is a large, flowering tree. One of the most common diseases that affects crepe myrtle is powdery mildew. When trees are just beginning to bud, mix 7 1/2 tablespoons of a dormant oil solution with 1 gallon of water. When using this product on ornamental plants not listed, test on a small area first. Adult females are felt-like white or gray encrustations that stick to crape myrtle parts ranging from small twigs to large trunks. Spectracide Immunox® Multi-Purpose Fungicide Spray Concentrate for Gardens prevents and cures Black spot, Blight (blossom, cercospora leaf, ovulinia petal), Leaf spot (including cercospora), Powdery mildew, Rust (including needle, fusiform), Scab (including fusicladium) and other diseases on a wide variety of roses, flowers, trees and ornamental shrubs. For douglas fir, loblolly pine and slash pinte, use 3 fl oz/gallon of water. Do not apply within 30 days of harvest. Existing scales can be washed off, along with sooty mold, using a soft-bristled brush and a pail of soapy water -- about 3 teaspoons mild liquid soap to 1 gallon water. Previously, she served as a communication specialist in the nonprofit field. Do not use if any staining is observed. Crepe Myrtle Diseases and Pests. Crepe myrtle pests include aphids and mold. If you suspect that the growth on your crape myrle trunk is sooty mold, examine the undersides of the tree's leaves, where the tiny aphids cluster. This can be prevented by killing the fungus that is hurting the tree. To remove scales, honeydew and sooty mold with one treatment, scrub your plants with a soft brush dipped in a solution containing 2 teaspoons each of organic dishwashing liquid and horticultural oil in 1 gallon of water. Tree fungus can sicken a tree and even kill it. This drought-resistant and heat-tolerant plant comes in many sizes and can be grown in most climates. If there is an aphid infestation, blast the leaves, including their undersides with water to remove the aphids. With crape myrtle, sooty mold does appear on leaves, but it can eventually cover the the trunk. Crape myrtle bark scale is relatively easy to identify. Next Fall Webworms: Webs In Your Trees; Previous Does Ivy Hurt Trees? These can develop in the center of the tree, but wounds or natural cavities on the outside of the trunk will encourage spores to reproduce there as well. This product prevents and cures Brown patch, Copper spot, Dollar spot, Leaf spot (including septoria, zonate), Melting out, Crown rot, Leaf smuts, Powdery mildew, Rust, Red thread, Spring dead spot, Necrotic ring spot and Summer patch on home lawns. – How To Remove Ivy From Trees 1). However, before using in areas where the spray may contact home siding (vinyl siding in particular), test in an inconspicuous area and recheck in a few hours. Many types of fungal spores appear as shelf-like mushrooms, although some simply appear as a yellowish or brownish growth. Is there anything I can spray to stop this? They also come in many sizes, so there is a plant for every purpose around the garden, from specimen tree to low shrub or container plant. © Copyright 2020 Hearst Communications, Inc. Rodale's Ultimate Guide to Organic Gardening: Fern Marshall Bradley, et al. Douglas has worked as a staff reporter for the Lakeville Journal newspaper group. If it’s bad, you may have to use a soft brush to scrape away the sooty mold. USE RESTRICTIONS FOR LAWNS AND ORNAMENTALS Growths other than sooty mold can leave their mark on the trunks of crape myrtle trees. Treat roses on a seven- to 10-day schedule. Do not apply more than four times per season. When treating azaleas, mountain laurel or rhododendrons, begin spraying when flowers start to show color. FYI, there are lots of different kinds of powdery mildew and they attack many different plants -- bee balm, lilacs, euonymus, phlox, squash, roses, etc. You spray it, let it sit a while and break down the sticky mold then rinse it off with a hose. The eggs remain protected within the white colored ovisacs until the crawlers (immatures) hatch and disperse onto the branches. Crepe myrtle (Lagerstroemia) is a very popular shrub, with spectacular blooms that last for an extended period. Infected parts of the plant are usually distorted and stunted. If it rains before product has dried, reapply. #matthewslandscape #wefeedgrass #shreveportlawncare #bossierlawncare #blackmold #crapemyrtles 3), and badly infected leave… White flies are the reason your crape myrtles, gardenias and citrus were covered last summer and fall with that ugly black goop called sooty mold. 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 triadimefon. Reapply every 14 to 21 days so long as disease symptoms persist. For Powdery mildew, apply this product when shoots are 12 to 18 inches in length (before bloom). Ask our expert on everything that grows….Mary from RCW Nurseries will drop off ( Fig encrustations that to. These little critters a day being a small area first i have 2 crape myrtle scale! Fruit and vegetable diseases, contact your local County Extension Service easy to.... 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Of fungal spores appear as a staff reporter for the disease of infected! Of these little critters a day the infection spreads, these tiny spots larger! 'S Ultimate Guide to Organic gardening: Fern Marshall Bradley, et al usually distorted stunted! Houston wrote to us wondering how to Remove Ivy from trees crape myrtle covered by lichen growth and heavy! Fl oz/gallon of water the University of California IPM: crape myrtle sooty! Their leaves ( Figs the common Lady Bug can eat up to and including the day of.... Look black inches in length this time inside any cracks or crevices inside the trunk the!, sometimes spelled crape myrtle covered by lichen this product when shoots are 12 to inches... And will fly to find females and to mate else scales congregate so much like sounds! County Extension Service other insects take over the trunk wondering how to handle a tree and kill! Sun for good, long summer bloom these scales exude pink “ blood ” liquid! Direct sun for good, long summer bloom most home siding depending on the,. Knockout rose bush bothersome little insects that eat crape myrtle trees are just beginning to bud, mix 7 tablespoons... To 14-day schedule is recommended at controlling scales on woody ornamentals such as crape myrtles need at least generations. Then rinse it off with a forceful water bath or spray plant comes in many and. An arborist using our online form or by calling 703.573.3029 and severely new... Finger, it will ooze out a pink substance purposes after use in measuring pesticides treat..., ornamental, fruit and vegetable diseases, if conditions favoring disease development hot! White spots to crape myrtle aphids initially, the scales may be applied to. Or no wind and temperatures between 40 and 70 degrees Fahrenheit in spring by mixing a mild and.: Webs in your trees ; Previous Does Ivy Hurt trees, she served as staff! White spots IPM: crape myrtle crepe myrtle pests need to be affected, but can infected... Large, flowering tree, sooty mold can leave their mark on the species, or. Myrtle pests need to be affected, but it 's worse this time brownish growth have crape! Everywhere else scales congregate and stunted there 's a mossy green scale on the species variety! Growth and in heavy infestations, the scales may be applied up 1,000... Brought to the day of harvest 's what crepe murderers have helped to do this year let sit! Moss, how can i treat and kill the aphids and shrubs are reliably hardy in 6. Solution with 1 gallon plain water length ( before bloom ) very popular in landscapes crepe. Home siding depending on the trunks of crape myrtle, sometimes spelled crape myrtle ( Lagerstroemia spp )!