Copyright Leaf Group Ltd. // Leaf Group Lifestyle. If your trees and shrubs are NOT showing signs of Powdery Mildew yet, that’s great! Unfortunately, some crape myrtle cultivars are susceptible to powdery mildew. Mildew is a fungus; the white powder you see is made up of spores. The best time to prune crape myrtles is in the winter, when they are dormant, or in the spring, before they have set new blooms. That type of pruning causes a mass of extremely thick weak growth, which in turn makes for the perfect fungus spore growing conditions. Choose organic or slow-release fertilizers instead. Consistent, reliable, long flowering, drought and heat tolerant. Early on it wipes off or washes away only to return again. Crape Myrtle Powdery Mildew. per 100 sq ft and spray the foliage with Garrett Juice plus either potassium bicarbonate or … It attacks many different kinds of ornamental and agricultural crops and is a well-known nuisance particularly in vineyards. If you prefer to use a nonchemical fungicide, choose one that contains neem oil, sulfur or potassium bicarbonate. Control begins by selecting powdery mildew resistant varieties. Place crape myrtle trees in full sun, with enough space around them so they are not crowded. Powdery mildew must be sprayed with several fungicide applications OR you can plant the National Arboretum Hybrids which are totally resistant to powdery mildew. Powdery Mildew: A wet spring can lead to powdery mildew on your crepe myrtles, especially if you are guilty of that harsh spring pruning (AKA: Crepe Murder!) She has worked on wide-ranging subjects from ancient history to literature to current events. There are various types of powdery mildew fungi and they typically only cause powdery mildew to a certain species or family of plants. It is common during cool, humid, cloudy days. The crape myrtle is especially susceptible to powdery mildew, as are flowers, such as roses, gerbera daisies, azalea and zinnias. Q: I have a crape myrtle and every year it is covered in a whitish powder. Also, prune the plant to make sure that the branches are spreading out with good air circulation and sunlight penetration. Powdery mildew fungus favours high humidity and dry conditions. Print This Page Crape Myrtle Powdery Mildew. Spray once, wait two weeks and spray again. Powdery mildew is a fungus which spreads a white or ash-grey film over the upper and lower surfaces of the leaves of plants-usually the older leaves. Vote It Up: Points: 59. Getting rid of fungus takes wit! If your crape myrtle's dark green leaves have turned white, your tree might be infected with mildew. Now, if you are facing powdery mildew, there are a variety of ways to treat it. Powdery Mildew. Trees and shrubs that are in fully shaded areas and lack good airflow are also susceptible. Another hybrid is 'Yuma' with its fantastic mauve flowers Fungus develops at high humidity, usually during spring and fall. Powdery mildew is a plant disease caused by a fungus. There is an Australian native crepe myrtle (Lagerstroemia archeriana), which grows to around 7m (20′) tall and has pinkish mauve flowers. The control is to apply whole ground cornmeal to the root zone at 2 lbs. Powdery mildew infections favor warm days and cool nights with and high relative humidity. These newly produced leaves must then replenish the food supply through photosynthesis. The Daconil was 1 tablespoon per gallon and baking soda solution numbers were also for 1 gallon of water. How to Treat Mildew on Crepe Myrtles The crepe myrtle, sometimes spelled crape myrtle or crapemyrtle, is a large, flowering tree. 2), infected shoots may dry up and shrivel, severely affected buds will drop off (Fig. To avoid mildew in the future, water only in the mornings and keep trees pruned. It produces numerous spores that, when seen under a microscope or hand lens, look like chains of beads. Heavily infected flowers may fail to open. The crape myrtle (Lagerstroemia spp.) Crape myrtles are prized where they can be grown for their beautiful flowers, long blooming season, and attractive, interesting bark. Avoiding excess fertilization also helps reduce susceptibility to powdery mildew. This fungal disease is a white or gray, powdery, growth on the lower leaf surface and flower buds of zinnias, crape myrtles, and many vegetables, phlox, lilac, melons, cucumbers, and many other plants. It's still pretty thin and leggy so I don't think that the mildew is coming from overcrowding of the branches. Water splash and air currents spread the spores of powdery mildew which grows on the surface of the leaf only. Infected leaves may look reddish beneath the mildew; the leaves often drop prematurely. Powdery mildew occurs most often on young, actively growing plant tissues (Fig. Consider an organic alternative. It also has interestingly textured trunks to accent the landscape in the winter months. Powdery mildew attacks crepe myrtles and other plants especially during humid weather. The crape myrtle is a popular woody ornamental plant. The gardener’s best bet is to select disease- resistant varieties and site these beautiful plants in full sun with good air circulation. In order to diagnose your plant correctly you need to know as much as possible about plant diseases, and most of our guide is devoted to that matter! Powdery mildew fungus favours high humidity and dry conditions. Water splash and air currents spread the spores of powdery mildew which grows on the surface of the leaf only. It sounds like you have powdery mildew on your crape myrtle, a common fungal disease. Powdery mildew is a common disease for many plants found in the high desert. I said I would take care of it myself for a much lower price. Selection of disease-resistant cultivars and hybridisation has led to a group of powdery mildew-resistant varieties. Powdery mildew spores can germinate and infect crape myrtle in the absence of free water on the plant tissue, as long as there is adequate humidity in the air. I read in The Sun the best solution is to cut it down and plant a new crepe myrtle. If it is severe, the flowers fail to open, and by late summer the tree looks a mess. It'll just make it so ugly that you'll wish it were dead. 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. When you water your trees, direct the water at the base or use drip hoses. Powdery mildew can be avoided by planting trees with native Indian names such as Picos, Osage, or Yuma. Interestingly, unlike many other landscape diseases, powdery mildew does not require the crape myrtle leaves to be moist for infection to occur. Powdery mildew infects the leaves, branches, and even flowers of most plants, and unlike most fungi, it can also be a problem even in dry weather. The Black Diamond series of crape myrtles are extremely resistant to diseases including powdery mildew and rarely have problems with pests. It can cause the leaves to curl and shrivel and buds to drop without opening. Older varieties of crepe myrtle were affected by powdery mildew. Do you have a question -or- need to contact an expert? Powdery mildew on crepe myrtle . Plant the trees in full sun, and do not crowd them with other plants. The development of hybrids between the L.indica and the L.fauriei species has resulted in varieties of crepe myrtle that are resistant to a fungal disease known as powdery mildew, and that's a major problem that can afflict the older varieties of the crepe myrtle. Apply fungicide. Powdery mildew is a common disease of roses, crepe myrtles, dahlias, zinnias, calendulas, sweet peas, cucurbits and vine crops. Powdery mildew. Mildew spreads rapidly. It grows in thin layers on the surface of buds, flowers, leaves, and shoots. Asked June 22, 2017, 7:14 PM EDT. This fungus grows in thin layers on the … Indian Summer Crepe Myrtles are a range of late summer flowering Crepe Myrtles that are specifically bred to be powdery mildew resistant. In the fall and early winter, the fungus produces an ascoma or clietothecia—an overwintering structure. Prevention is the best management method. Powdery mildew typically develops in late spring and fall and is associated … He looked confused. According to Mississippi State University, pruning will increase air circulation, decreasing humidity and making it less likely that mildew will spread. Some varieties of crape myrtles get powdery mildew every year, and others rarely have it. Leaves, shoots, and flower buds are covered with a thin layer or irregular patches of a grayish white powdery material. Its deep green foliage and bright-colored blooms last throughout the summer and its interestingly textured trunk accents the landscape in winter. Powdery mildew is a white fungus that can grows on the leaves and flower buds of a crepe myrtle. Every year trees and shrubs rely on their food reserves to push out new leaf growth. The fungus Erysiphe lagerstroemiae causes powdery mildew. Our work makes a difference, in the lives of Texans and on the economy. Pest & disease resistant Tree & shrub form ranging in different mature growth rates Beautiful flowers in a range of colours Sun lovers Attractive bark Mildew thrives in warm, moist conditions. http://aggie-horticulture.tamu.edu/ southerngarden/lager.html, US National Arboretum – Information about crape myrtle varieties and characteristics, including powdery mildew resistance. Though this type of mildew can spread quickly with the right conditions, it's only topical and rarely fatal to the plant. This fungal disease is usually not lethal to crape myrtles but is certainly not attractive. The Powdery Mildew pictured here is on a Crepe Myrtle. 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. Not to mention, especially if they’re inside your home. No wonder the squash get hit every year! They may even die. Learn all about it, as well as some treatment options! Avoiding excess fertilization also helps reduce susceptibility to powder… Click for a hub of Extension resources related to the current COVID-19 situation. Despite its usual hardiness, in the spring and fall, some leaves may turn grayish white. Crepe myrtle; Hydrangea; Ajuga; Photinia; Sweet pea; Zinnia; Apple; Grape; Rose; Strawberry; F irst appearing as faint white spots on leaves, powdery mildew gradually forms a white dusty film over the entire surface. Natural fungicides such as neem oil extract and potassium bicarbonate are effective when used correctly. Most Read. genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. Are they coated with a white, powdery-looking substance? Plan the perfect garden with our interactive tool →. Crape Myrtles resistant to powdery mildew. Powdery mildew spores can germinate and infect crape myrtle in the absence of free water on the plant tissue, as long as there is adequate humidity in the air. But all variations will start with small white spots like pictures here. × View full size in a new window × View full size in a new window. The wind carries the powdery mildew spores to other plants. Warm days and cool nights (60° to 80°F) favor development and spread of powdery mildew. Some fungicides, both natural and synthetic, are available to help control powdery mildew. Powdery Mildew. Baltimore County Maryland. These are the cleistothecia or overwintering bodies of the fungus. Wonderful range of sizes and colours. Some varieties are more susceptible to it than others. This is a fungal disease that attacks the leaves, shoots and buds. If you have a heavy infestation on the tips, try pruning it back, but not by much or you may delay blooming even longer. Older varieties of crepe myrtle were affected by powdery mildew. A representative from my lawn care company came to assess my yard and let me know that he could treat it for the low low price of $65.99. I laughed. Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. Susceptible species include Lilacs, Peonies, Dogwoods, Roses, Azaleas, Crape Myrtles, Oaks, Rhododendrons, Hydrangeas, and Euonymus. per 100 sq ft and spray the foliage with Garrett Juice plus either potassium bicarbonate or cornmeal juice. It can completely cover and severely damage new plant growth. Selective pruning and plant placement in the landscape to encourage good air circulation can suppress humidity levels and reduce the opportunities for powdery mildew spores to settle on plant tissue. It is best to prevent the growth of mildew, but if your tree is already infected, following these steps will help you restore it to its former beauty. Apply as directed; keep applying until the mildew has retreated. Avoid high-nitrogen fertilizers, which can encourage mildew growth. Advertisement. Cornmeal juice is made by soaking a pound of cornmeal in 5 gallons of water. Use a broad spectrum fungicide such as Daconil, Funginex or Immunox. Common victims of powdery mildew . Powdery mildew is a white fungus that can grows on the leaves and flower buds of a crepe myrtle. Powdery mildew can affect a very wide range of hosts an is usually observed most frequently later in the summer following humid weather conditions. After each cut, dip your pruners in white vinegar to kill any spores. Selective pruning and plant placement in the landscape to encourage good air circulation can suppress humidity levels and reduce the opportunities for powdery mildew spores to settle on plant tissue. Examine your crape myrtle's leaves. If it is severe, the flowers fail to open, and by late summer the tree looks a mess. Indian Summer Crepe Myrtle (Lagerstroemia indica x L. fauriei) The Indian Summer range has been specially bred to resist powdery mildew, a fungal disease that can be seen on some older crepe myrtle varieties. Black Diamond Crape Myrtle Dwarf Series Best Red Black Diamond Crape Myrtle The Best Red falls in-between the Crimson Red and Red Hot in … This fungal disease is usually not lethal to crape myrtles but is certainly not attractive. Mary Kenney has been a writer and editor of educational media for around 15 years. CAUSAL AGENT. Disease development slows when leaf temperatures exceed 90°F. Wonderful range of sizes and colours. 1 Response. Prevention is the best management method. Is there any solution for getting rid of the powdery mildew on my crepe myrtle? This disease is fairly easy to recognize since it causes white cottony growth of the fungus on the surface of leaves, flowers, fruits and other parts of the plant. Powdery mildews are characterized by spots or patches of white to grayish, talcum-powder-like growth. Additionally, crape myrtle should be planted in sunny locations allowing free air movement so wet foliage dries quickly. Crape Myrtle Powdery Mildew Powdery mildew attacks crepe myrtles and other plants especially during humid weather. Older leaves are less likely to be affected, but can become infected under conditions favorable for the disease. The most effective way to control powdery mildew is to prevent it. If you think your trees or shrubs are showing signs of Powdery Mildew schedule an appointment with one of our Certified Arborists to get a diagnosis and begin treatment. Confirm the problem. A white or gray powder coasts the surface of the plant. Howard County Maryland. Asked July 9, 2017, 3:08 PM EDT. Crepe Myrtle with Powdery Mildew. Research new crape myrtles. If you prefer to use a nonchemical fungicide, choose one that contains neem oil, sulfur or potassium bicarbonate. Allow proper plant spacing for … FYI, there are lots of different kinds of powdery mildew and they attack many different plants -- bee balm, lilacs, euonymus, phlox, squash, roses, etc. Most of the plant owners like the use the common fungicides. Powdery mildew fungi will also infect flowers, causing them to develop abnormally or fail to open. Warm days and cool nights (60° to 80°F) favor development and spread of powdery mildew. Download a printer-friendly version of this publication: Powdery Mildew on Crape Myrtles, View more Gardening & Landscaping information ». Advertisement . 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