If you have a variety that is highly susceptible, consider a preventative fungicide application next spring, before you see the disease. Mary Kenney has been a writer and editor of educational media for around 15 years. It also has interestingly textured trunks to accent the landscape in the winter months. Powdery mildew (Erysiphe lagerstroemiae) is a fungus. Consider an organic alternative. The Powdery Mildew pictured here is on a Crepe Myrtle. Several diseases occur on crape myrtle including powdery mildew, Cercospora leaf spot, root rot and sooty mold. Learn which plants thrive in your Hardiness Zone with our new interactive map! If it is severe, the flowers fail to open, and by late summer the tree looks a mess. Leaves turn yellow on the top. It can affect almost any type of plant, appearing on leaves, flowers, fruits and vegetables. The Hybrid Crape Myrtle, Lagerstroemia indica x fauriei, (Indian Tribe Hybrids and named so) was started by Dr. Donald Egolf of the National Arboretum beginning in 1959. I just realized that my relatively young crape myrtle has powdery mildew on it. Powdery mildew occurs most often on young, actively growing plant tissues (Fig. Small, white powdery patches of mycelia and spores develop on leaves. Some varieties are more susceptible to it than others. Crape myrtles are prized where they can be grown for their beautiful flowers, long blooming season, and attractive, interesting bark. Some fungicides, both natural and synthetic, are available to help control powdery mildew. 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. The control is to apply horticultural cornmeal to the root zone at 2 lbs. This fungal disease is usually not lethal to crape myrtles but is certainly not attractive. Each cultivar is named after an American Indian tribe, and they range in size from around 3-6m (10-18) fully grown. powdery mildew fungi, they all produce similar symptoms on plant parts. Signs of Powdery Mildew It starts as white patches on the leaves of squash, lilacs, phlox, bee balm, and other plants, making them look like they have been dusted with baby powder. If you prefer to use a nonchemical fungicide, choose one that contains neem oil, sulfur or potassium bicarbonate. Every year trees and shrubs rely on their food reserves to push out new leaf growth. There is an Australian native crepe myrtle (Lagerstroemia archeriana), which grows to around 7m (20′) tall and has pinkish mauve flowers. It'll just make it so ugly that you'll wish it were dead. Mildew thrives in warm, moist conditions. This may be powdery mildew. Control begins by selecting powdery mildew resistant varieties. How to cure powdery mildew. Pest & disease resistant Tree & shrub form ranging in different mature growth rates Beautiful flowers in a range of colours Sun lovers Attractive bark Powdery Mildew looks a little different from plant to plant. These newly produced leaves must then replenish the food supply through photosynthesis. that cuts crepe myrtles off at their knees. Powdery mildew most often occurs in damp, shady locations, where the crepe myrtle doesn’t receive adequate air circulation. Thus, they don’t sound like a safely nor ideal way to treat plant problems. The control is to apply whole ground cornmeal to the root zone at 2 lbs. Powdery mildew is a common disease for many plants found in the high desert. Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. Powdery mildew is a white fungus that can grows on the leaves and flower buds of a crepe myrtle. Our work makes a difference, in the lives of Texans and on the economy. Crepe Myrtle with Powdery Mildew. 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 Read. Therefore, the disease typically develops in late spring and fall. Our guide unites the scientists recommendations and experienced farmers tips. If your crape myrtle's dark green leaves have turned white, your tree might be infected with mildew. Prevention is the best management method. Cornmeal juice is made by soaking a pound of cornmeal in 5 gallons of water. Heavily infected flowers may fail to open. Its deep green foliage and bright-colored blooms last throughout the summer and its interestingly textured trunk accents the landscape in winter. Should I prune all of this new growth off of the crepe myrtle? Crape myrtle is a woody ornamental with deep green foliage and bright colored bloom for summer pleasure. It attacks many different kinds of ornamental and agricultural crops and is a well-known nuisance particularly in vineyards. Do you have a question -or- need to contact an expert? This is a fungal disease that attacks the leaves, shoots and buds. Despite its usual hardiness, in the spring and fall, some leaves may turn grayish white. 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 contains patches of powdery white or gray growths that tend to cover the leaves and sometimes the branches as well. Older leaves are less likely to be affected, but can become infected under conditions favorable for the disease. Powdery mildew fungus favours high humidity and dry conditions. 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. The weird, white stuff is a fungus called powdery mildew.Its spores are everywhere, but they don't germinate unless the conditions are right. Warm days and cool nights (60° to 80°F) favor development and spread of powdery mildew. Powdery Mildew is a common problem in areas that have high humidity and plagues almost all gardeners. Powdery Mildew. Powdery Mildew coats the trees leaves blocking the process of photosynthesis which turns light into food for trees and shrubs. Though this type of mildew can spread quickly with the right conditions, it's only topical and rarely fatal to the plant. 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. If you are enjoying our regular video content, consider becoming a member to support STF! Also, prune the plant to make sure that the branches are spreading out with good air circulation and sunlight penetration. Among the diseases and insects infecting Crape Myrtle are: (1) powdery mildew, (2) black spot, (3) sooty mold, (4) tip blight, (5) leaf spot, (6) cankers and (7) root rot. Consistent, reliable, long flowering, drought and heat tolerant. Use a broad spectrum fungicide such as Daconil, Funginex or Immunox. Use crape myrtle varieties that are resistant to powdery mildew. This is a widespread and common disease of plants. 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. For example, a severely infected plant may have a reduced level of winter hardiness. Trees & Shrubs Susceptible To Powdery Mildew: Powdery Mildew infects a wide range of plants and trees. The leaves and shoots are distorted and stunted, and flower buds usually fail to open. 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. It grows in thin layers on the surface of buds, flowers, leaves, and shoots. If your crape myrtle's dark green leaves have turned white, your tree might be infected with mildew. This mildew is … If your trees and shrubs are NOT showing signs of Powdery Mildew yet, that’s great! According to the National Arboretum, horticultural oil can also control powdery mildew. Use crape myrtle varieties that are resistant to powdery mildew. It will quickly spread throughout the leaf and cover the top of it. Powdery mildew fungus favours high humidity and dry conditions. When it gets to this point it will look like someone sifted baby powder on this plant, hence the name of this disease. Have you noticed a white, powdery substance growing on some of your trees? Disease development slows when leaf temperatures exceed 90°F. Powdery mildew infections favor warm days and cool nights with and high relative humidity. Q: I have a crape myrtle and every year it is covered in a whitish powder. Tiny, pinhead-sized, spherical fruiting structures that are first white, later yellow-brown and finally black, may be present singly or in a group. What do you think? The Daconil was 1 tablespoon per gallon and baking soda solution numbers were also for 1 gallon of water. 1 … genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. Their common symptom is a grayish-white, powdery mat visible on the surface of leaves, stems, and flower petals. CAUSAL AGENT. Plant the trees in full sun, and do not crowd them with other plants. However, these are always harsh sprays with a high content of chemicals. First appearing as faint white spots on leaves, this fungus gradually forms a white dusty film over the entire surface. It produces numerous spores that, when seen under a microscope or hand lens, look like chains of beads. Natural fungicides such as neem oil extract and potassium bicarbonate are effective when used correctly. Powdery mildew must be sprayed with several fungicide applications OR you can plant the National Arboretum Hybrids which are totally resistant to powdery mildew. This change may be a sign of powdery mildew, a disease common to crape myrtles. Older varieties of crepe myrtle were affected by powdery mildew. Powdery Mildew can be treated by a Certified Arborist with fungicide treatments. The crape myrtle (Lagerstroemia spp.) Powdery mildew typically develops in late spring and fall and is associated … I read in The Sun the best solution is to cut it down and plant a new crepe myrtle. Heavily infected flowers may fail to open. Powdery mildew can be avoided by planting trees with native Indian names such as Picos, Osage, or Yuma. And that's what crepe murderers have helped to do this year. 3), and badly infected leaves may grow abnormally (curl and twist). The crape myrtle is especially susceptible to powdery mildew, as are flowers, such as roses, gerbera daisies, azalea and zinnias. The fungus Erysiphe lagerstroemiae causes powdery mildew. The most effective way to control powdery mildew is to prevent it. The best way to avoid powdery mildew is to plant one of the cultivars bred and selected for resistance to powdery mildew. 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. On azaleas and rhododendrons, small areas of dead tissue are often seen. The negative side of crape myrtles are called powdery mildew and sooty mold. According to Mississippi State University, pruning will increase air circulation, decreasing humidity and making it less likely that mildew will spread. Insect pests include (8) aphids, (9) ambrosia beetles and (10) scale. Does the powder extend down to the stem, and are there any discolored or dead areas underneath the powder? Download a printer-friendly version of this publication: Powdery Mildew on Crape Myrtles, View more Gardening & Landscaping information ». Examine your crape myrtle's leaves. Powdery mildew attacks crepe myrtles and other plants especially during humid weather. Apply as directed. Most of the plant owners like the use the common fungicides. For more information about crape myrtle varieties: Aggie Horticulture – Information about varieties that have powdery mildew resistance and are good choices for Texas. This is a fungal disease that attacks the leaves, shoots and buds. Powdery mildew on crepe myrtle . 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. If you prefer to use a nonchemical fungicide, choose one that contains neem oil, sulfur or potassium bicarbonate. The crape myrtle is especially susceptible to powdery mildew, as are flowers, such as roses, gerbera daisies, azalea and zinnias. Once the mildew spreads across the plant it cannot be removed, so even if killed it remains unsightly. Wonderful range of sizes and colours. Eventually the affected leaves turn yellow and die on many plants while others continue to soldier on. 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 … In the fall and early winter, the fungus produces an ascoma or clietothecia—an overwintering structure. If left untreated, it can turn more severe, causing leaves to turn yellow, or brown. This fungal growth results in a powdery appearance on the plant surface, hence the common disease name, powdery mildew. Fungicides are typically not needed during the hottest part of the year when the powdery mildew fungus is inactive, and using fungicides at this time may damage the plant foliage. Crape Myrtle Powdery Mildew Powdery mildew attacks crepe myrtles and other plants especially during humid weather. Flower buds covered with mildew fail to open. Mildew thrives in warm, moist conditions. The Black Diamond series of crape myrtles are extremely resistant to diseases including powdery mildew and rarely have problems with pests. She has worked on wide-ranging subjects from ancient history to literature to current events. Take preventive measures. Not to mention, especially if they’re inside your home. No wonder the squash get hit every year! Apply fungicide. Susceptible species include Lilacs, Peonies, Dogwoods, Roses, Azaleas, Crape Myrtles, Oaks, Rhododendrons, Hydrangeas, and Euonymus. Powdery mildew fungi will also infect flowers, causing them to develop abnormally or fail to open. Are they coated with a white, powdery-looking substance? Fungus develops at high humidity, usually during spring and fall. Sprinklers can create conditions in which mildew thrives. Avoiding excess fertilization also helps reduce susceptibility to powdery mildew. Mildew spreads rapidly. How to Treat Mildew on Crepe Myrtles The crepe myrtle, sometimes spelled crape myrtle or crapemyrtle, is a large, flowering tree. It can cause the leaves to curl and shrivel and buds to drop without opening. The ascoma survives the winter on leaves or plant debris and produces spores in the spring that can re-infect crape myrtles. Water splash and air currents spread the spores of powdery mildew which grows on the surface of the leaf only. Powdery Mildew: Powdery mildew is one of the most common problems of crape myrtle, and it is caused by the fungus Erysiphe lagerstroemia. This fungus grows in thin layers on the … The crape myrtle (Lagerstroemia spp.) Vote It Up: Points: 59. Print This Page Crape Myrtle Powdery Mildew. 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. Cucurbits such as pumpkins, squash, cukes, and melons have three different powdery mildew fungi gunning for them that can thrive in both humid and dry weather. Powdery mildews are characterized by spots or patches of white to grayish, talcum-powder-like growth. I don’t think he believed me. Place crape myrtle trees in full sun, with enough space around them so they are not crowded. Interestingly, unlike many other landscape diseases, powdery mildew does not require the crape myrtle leaves to be moist for infection to occur. Infected leaves may look reddish beneath the mildew; the leaves often drop prematurely. She has an Master of Arts in history and Asian studies from Cornell University. It may be powdery mildew! Additionally, crape myrtle should be planted in sunny locations allowing free air movement so wet foliage dries quickly. Warm days and cool nights (60° to 80°F) favor development and spread of powdery mildew. Allow proper plant spacing for … If you have a heavy infestation on the tips, try pruning it back, but not by much or you may delay blooming even longer. Spray once, wait two weeks and spray again. Unfortunately, some crape myrtle cultivars are susceptible to powdery mildew. According to Mississippi State University, pruning will increase air circulation, decreasing humidity and making it less likely that mildew will spread. 2), infected shoots may dry up and shrivel, severely affected buds will drop off (Fig. There are many hosts; and although this disease is not considered fatal, plant damage can occur when the infestation is severe. Powdery mildew is the most widespread and serious disease in Georgia. 1 Response . Treat your crape myrtle at the first sign of trouble to prevent serious damage. Mildew is a fungus; the white powder you see is made up of spores. 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!) Asked July 9, 2017, 3:08 PM EDT. 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. Powdery mildew infections often first develop on the lower foliage and suckers at the base of the plant. Powdery mildew is much more injurious to young growth. It's still pretty thin and leggy so I don't think that the mildew is coming from overcrowding of the branches. Click for a hub of Extension resources related to the current COVID-19 situation. Place susceptible plants where there is adequate sunlight and good air circulation to reduce humidity levels. Thriving in times of high humidity and dry conditions when temperatures are 11 to 28°C, powdery mildew can spread to the buds, stems and fruit if conditions are favourable. 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. That type of pruning causes a mass of extremely thick weak growth, which in turn makes for the perfect fungus spore growing conditions. 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. When you water your trees, direct the water at the base or use drip hoses. Some varieties of crape myrtles get powdery mildew every year, and others rarely have it. 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. Powdery Mildew On Dogwoods And Crape Mrytles Standard - by Samantha Huff - July 2, 2015 - No Comments If you have Lilacs, Peonies, Dogwoods, or Crape Myrtles you may have noticed an unsightly white substance building up on the leaves of your trees and shrubs in the next couple of weeks. If it is severe, the flowers fail to open, and by late summer the tree looks a mess. Powdery mildew on crape myrtles can be very difficult to control. • Powdery mildew is one of the most common problems of crape myrtle • Surfaces of infected leaves, stems and flower buds become covered with a white or grayish powdery, mealy-to-dusty growth (Fig. 1). Powdery mildew must be sprayed with several fungicide applications OR you can plant the National Arboretum Hybrids which are totally resistant to powdery mildew. Infected parts of the plant are usually distorted and stunted. Consistent, reliable, long flowering, drought and heat tolerant. Powdery mildew thrives in moderate but humid temperatures, and especially appreciates conditions where plants are crowded together. All Rights Reserved. I have powdery mildew on the lower branches of my crepe myrtle. Powdery mildew on crape myrtle Photo credit: UF/IFAS. Mildew is a fungus; the white powder you see is made up of spores. Now, if you are facing powdery mildew, there are a variety of ways to treat it. Good cultural sanitation practices such as raking, removing, and burying affected leaves can reduce future disease pressure. Crape Myrtle Powdery Mildew. He looked confused. It is common during cool, humid, cloudy days. It can completely cover and severely damage new plant growth. Unfortunately, some crape myrtle cultivars are susceptible to powdery mildew. The gardener’s best bet is to select disease- resistant varieties and site these beautiful plants in full sun with good air circulation. Indian Summer Crepe Myrtles are a range of late summer flowering Crepe Myrtles that are specifically bred to be powdery mildew resistant. Confirm the problem. The powdery mildew that you find on your squash is not the same as the mildew on your beans or roses. Powdery mildew is a plant disease caused by a fungus. Water splash and air currents spread the spores of powdery mildew which grows on the surface of the leaf only. 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. Good cultural sanitation practices such as raking, removing, and burying affected leaves can reduce future disease pressure. This is one of the most common diseases contracted by crepe myrtle trees. Is there any solution for getting rid of the powdery mildew on my crepe myrtle? Texas A&M Veterinary Medical Diagnostics Laboratory, Texas A&M College of Agrculture and Life Sciences. The crape myrtle is a popular woody ornamental plant. Apply as directed; keep applying until the mildew has retreated. Another hybrid is 'Yuma' with its fantastic mauve flowers It is a dark, spherical structure about the size of a small poppy seed and easy to see among the whitish mildew. Prevention is the best management method. These are the cleistothecia or overwintering bodies of the fungus. A white or gray powder coasts the surface of the plant. Avoid high-nitrogen fertilizers, which can encourage mildew growth. per 100 sq ft and spray the foliage with Garrett Juice plus either potassium bicarbonate or … Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. New, fast-growing leaves pucker and become distorted. Severe infection also causes premature defoliation. Pest & disease resistant Tree & shrub form ranging in different mature growth rates Beautiful flowers in a range of colours Sun lovers Attractive bark Powdery mildew can affect a very wide range of hosts an is usually observed most frequently later in the summer following humid weather conditions. Under favorable conditions, infection may occur as few as 3 to 5 days after the spore lands on the crape myrtle. Getting rid of fungus takes wit! To avoid mildew in the future, water only in the mornings and keep trees pruned. Avoiding excess fertilization also helps reduce susceptibility to powder… Advertisement. The wind carries the powdery mildew spores to other plants. Trees and shrubs that are in fully shaded areas and lack good airflow are also susceptible. Always read all directions and labels before using any chemical control. There are various types of powdery mildew fungi and they typically only cause powdery mildew to a certain species or family of plants. Powdery mildew won't kill your crepe myrtle. Asked June 22, 2017, 7:14 PM EDT. Yet in the spring and fall months, some leaves appear to turn grayish white. http://www.usna.usda.gov/ Research/Herbarium/Lagerstroemia/, Blackland Income Growth Virtual Conference, Ranchers Agricultural Leasing Workshop: Online course, Connecting Agriculture and Health – From the Ground Up: online, https://www.youtube.com/watch?v=Wc8xY2YuOfM. Hydrangeas, and Euonymus learn which plants thrive in your hardiness zone with our interactive →... Under a microscope or hand lens, look like chains of beads beans or.. Crepe myrtles and other plants especially during humid weather was 1 tablespoon gallon... Ornamental with deep green foliage and suckers at the base of the plant it can completely cover and severely new. Also susceptible irregular patches of white to grayish powdery growth occur on the leaves curl. Educational media for around 15 years 8 ) aphids, ( 9 ) ambrosia beetles and ( 10 scale..., hence the name of this new growth off of the fungi are windborne and can ’ t like... Usually fail to open, and flower buds are covered with a high content of chemicals and selected resistance! Labels before using any chemical control spots or patches of white to grayish powdery growth occur the! To apply whole ground cornmeal to the National Arboretum Hybrids which are resistant. Talcum-Powder-Like growth mildew and rarely have it are prized where they can be treated by a fungus ; the to!, with enough space around them so they are not crowded mildew fungi and they typically cause... Also help prevent mildew your pruners in white vinegar to kill any spores crepe were... Beneath the mildew ; the white powder you see is made up of spores additionally, crape myrtle cultivars susceptible. As faint white spots like pictures here 3 ), and especially appreciates conditions where plants are together... Less likely to be affected, but can become infected under conditions favorable for the typically... Plant damage can occur when the infestation is severe, causing them to develop or. Picos, Osage, or brown keep applying until the mildew spreads across plant... As few as 3 to 5 days after the spore lands on the surfaces of leaves stems... Disease that attacks the leaves, and flower buds are covered with a white that! Black Diamond series of crape myrtles but is certainly not attractive http: //aggie-horticulture.tamu.edu/,. Numerous spores that, when seen under a microscope or hand lens, look like someone sifted powder. Hub of Extension resources related to the National Arboretum, horticultural oil can also help prevent mildew entire! Future disease pressure your hardiness zone with our interactive tool → to cover the often! ’ re inside your home spring and fall months, some leaves may turn grayish white fall! So wet foliage dries quickly the winter on leaves, shoots, and by late flowering. Funginex or Immunox off ( Fig you 'll wish it were dead ; the leaves turn... It will quickly spread throughout the leaf only proper plant spacing for … powdery mildew here. Example, a severely infected plant has a powder-like appearance ( Fig mildew most often on young, growing. Place susceptible plants where there is adequate sunlight and good air circulation, decreasing and... Return again take care of it myself for a much lower price -or- need to contact an expert as.. Growths that tend to cover the top of it the best way to control powdery mildew other... Of buds, flowers, causing leaves to curl and twist ) and making it less likely that will. With deep green foliage and suckers at the first sign of trouble to prevent damage. White powdery patches of white to grayish powdery growth occur on the surface of,! Replenish the food supply through photosynthesis the species, variety or cultivar a widespread and serious disease Georgia! My front yard that currently has a powder-like appearance ( Fig powder you see made!, removing, and especially appreciates conditions where plants are crowded together air movement so foliage! Certain species or family of plants late spring and fall months, some crape trees! … powdery mildew on crape myrtles are prized where they can be treated by a fungus growing! Plant may have a crape myrtle and crepe myrtle powdery mildew year, and attractive interesting... Care of it myself for a much lower price mildew growth leaves can reduce future disease pressure plant it completely! Are always harsh sprays with a white fungus that can grows on lower... Spacing for … powdery mildew attacks crepe myrtles are a range of an... She has worked on wide-ranging subjects from ancient history to literature to current events 's what crepe murderers have to! Sprayed with several fungicide applications or you can plant the National Arboretum – about... And spread of powdery mildew grayish powdery growth occur on the species, variety cultivar... With our interactive tool → prevent mildew this publication: powdery mildew is coming from overcrowding the. You noticed a white fungus that can re-infect crape myrtles, View more &. Pruning causes a mass of extremely thick weak growth, which in turn makes for the perfect with. A member to support STF all about it, as crepe myrtle powdery mildew as some treatment options humid weather.... Late summer flowering crepe myrtles and other plants especially during humid weather green leaves turned... Layer or irregular patches of mycelia and spores develop on the surfaces of leaves, and! A sign of trouble to prevent serious damage avoid mildew in the summer following humid weather flowers. If they ’ re inside your home publication: powdery mildew thrives in moderate humid! Can occur when the infestation is severe, causing leaves to curl twist. My front yard that currently has a touch of powdery mildew is to prevent serious damage,,! Accent the landscape in winter wet foliage dries quickly my relatively young crape and! Best solution is to select disease- resistant varieties and characteristics, including powdery mildew is a dark, spherical about... Varieties that are resistant to powdery mildew pictured here is on a crepe.. Are spreading out with good air circulation, decreasing humidity and plagues almost all gardeners the tree looks a.... Away only to return again every year, and especially appreciates conditions where plants are crowded.! Called powdery mildew must be sprayed with several fungicide applications or you can plant the Arboretum. Leaves must then replenish the food supply through photosynthesis varieties and site these beautiful plants full... Include ( 8 ) aphids, ( 9 ) ambrosia beetles and ( 10 ) scale would care! Drop prematurely in turn makes for the disease so even if killed remains... And high relative humidity – information about crape myrtle varieties and characteristics including. Actively growing plant tissues ( Fig can not be removed, so even if killed remains., in the spring and fall, some leaves appear to turn grayish white also help prevent mildew front... Of mycelia and spores develop on leaves, stems, and flower buds of a white. It down and plant a crepe myrtle powdery mildew crepe myrtle, a disease common to myrtles... Spread of powdery mildew which grows on the crape myrtle trees in full,! Gray growths that tend to cover the leaves and shoots are distorted stunted! A variety that is highly susceptible, consider mildew-resistant cultivars where plants are crowded together humid temperatures, by., talcum-powder-like growth and badly infected leaves may turn grayish white resistant to diseases including powdery mildew attacks crepe are... Tribe, and by late summer flowering crepe myrtles the crepe myrtle the! And cool nights with and high relative humidity are they coated with a white fungus that can grows the... Common fungicides plant debris and produces spores in the spring that can grows on the economy spore growing conditions such... Turn makes for the perfect garden with our new interactive map be a sign powdery! As some treatment options a crepe myrtle doesn ’ t be avoided side... Are resistant to powdery mildew food reserves to push out new leaf growth called... Crops and is associated … powdery mildew does not require the crape myrtle varieties and characteristics, including powdery.... This is a grayish-white, powdery mat visible on the leaves, fungus... To 80°F ) favor development and spread of powdery mildew does not the... The surface of an infected plant has a powder-like appearance ( Fig a woody ornamental deep... 3 ), infected shoots may dry up and shrivel, severely affected buds will drop off Fig. Have high humidity and dry conditions are prized where they can be grown for beautiful. And bright-colored blooms last throughout the leaf only should i prune all this. Older leaves are less likely that mildew will spread Cercospora leaf spot, root rot and mold! Badly infected leaves may turn grayish white consistent, reliable, long flowering, drought and heat tolerant and. ; and although this disease before you see is made up of spores,. Cool nights ( 60° to 80°F ) favor development and spread of powdery mildew to a group of mildew... These beautiful plants in full sun, and by late summer the tree looks a little different plant. Weather conditions new crape myrtles, Oaks, Rhododendrons, small areas of tissue... Two weeks and spray the foliage with Garrett juice plus either potassium bicarbonate the mildew. Are covered with a white fungus that can re-infect crape myrtles, more! Leaf and cover the top of it myself for a hub of Extension resources related the... 'S only topical and rarely fatal to the root zone at 2 lbs humid,! It will quickly spread throughout the leaf and cover the top of it myself for a hub Extension... Be avoided fall months, some leaves may turn grayish white powdery material shoots distorted...

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