It can produce numerous spores, when seen under the microscope looks like chains of beads. It is wise to choose cultivars of Lagerstroemia that have a resistance to powdery mildew. It’s truly one of those trees that look good at any time of the year. Follow the fungicide directions exactly, and thoroughly dowse the plant with it. The information given herein is for educational purposes only. Powdery mildew spores are disseminated by wind. Care should be observed when using any fungicide. Sorry, your blog cannot share posts by email. Encourage good circulation through selective pruning and/or proper placement of plant in the landscape to reduce chances of spore settling and humidity level, and allows for full sun. Crape myrtle is a woody ornamental with deep green foliage and bright colored bloom for summer pleasure. With so many new colours in the range you really are spoilt with choice so why not choose a favourite or the whole series of Diamonds in the Dark Crepe Myrtle – they really will be a shining gem in your garden. With so many new colours in the range you really are spoilt with choice so why not choose a favourite or the whole series of Diamonds in the Dark Crepe Myrtle – they really will be a shining gem in your garden. Severely infection may also cause premature defoliation. The Texas A&M University System, U.S. Department of Agriculture, and the County Commissioners Courts of Texas Cooperating. Crape myrtles with good to excellent resistance to powdery mildew include Tonto, Muskogee, Acoma, Souix, Tuskegee and many other. Oils work best as eradicants but have some preventive activity. Many people fight powdery mildew by trimming back all affected branches, but this can reduce a floral display if done too late in the season. GET BREAKING NEWS IN YOUR BROWSER. Master Gardener: Powdery mildew on crape myrtles, Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to email this to a friend (Opens in new window), 2020 Latest: Democrat Joe Biden wins Virginia. The best management method is prevention. References to commercial products or trade names are made with the understanding that no discrimination is intended and no endorsement by Texas AgriLife Extension Service personnel is implied. Broadcast: Mar 18th Powdery mildew growth may be arrested when leaf temperature is above 90°F. Use resistant varieties, provide the plants with full sun, and using good cultural practices, such as avoiding excess fertilization and removing affected leaves in the fall, will adequately manage powdery mildew in most situations. Older leaves are less likely to be affected, but can become infected under conducive conditions for the disease. Growing from 10 to 12 feet tall and 6 to 8 feet wide, Black Diamond Crape Myrtles stay compact and can fit in most landscapes. It may be necessary to repeat applications every seven to 10 days because the plant will grow and develop new shoots and leaves that are unprotected. Remember these trees are drought tolerant and after establishment require little water. The spores and mycelia of powdery mildew are sensitive to extremes of heat and sunlight. Severely affected buds will abort and drop off. Touch of Class Plants Counter-intuitively, rain does not increase the likelihood of powdery mildew, as the spores do not thrive in water. Although it usually is not fatal to the plant, it can cause dwarfing of new growth and death of foliage. Powdery mildew spores can germinate and infect crape myrtle in the absence on free water on the plant tissue, as long as there is … In the later part of the year, this fungus can produce an overwintering structure call the ascoma. References to commercial products or trade names are made with the understanding that no discrimination is intended and no endorsement by Texas AgriLife Extension Service personnel is implied. Think crepe myrtle. Texas Plant Disease Diagnostic Laboratory. It is essential to follow the directions on pesticide labels. Meet Mystic Magenta has striking black foliage and masses of magenta pink blooms. These products are usually a beneficial bacterium that can destroy fungal pathogens. (03) 5629 2443 Click for a hub of Extension resources related to the current COVID-19 situation. AgriLife Extension's online Bookstore offers educational information and resources related to our many areas of expertise and programming; from agriculture, horticulture, and natural resources to nutrition, wellness for families and youth, and much more. I have been told it is powdery mildew but I don’t know how to control it. But starting now, a thorough dowsing with a horticultural or plant based oil spray will help reduce a light to moderate case of this fungal disease. This may be powdery mildew. They are mainly used as a preventive, although they may kill the mildew they contact. It also has interestingly textured trunks to accent the landscape in the winter months. Mel shows us some exciting varieties in the Touch of Class Diamonds in the Dark Collection. For more information on natural and synthetic fungicides, please contact your local County Extension Agent. At just 3-meters tall and 2.5-meters wide, they’re the perfect feature tree for both traditional and modern gardens, big and small. Brentwood 2-year-old boy dies of fentanyl overdose, mother charged with murder, Decision time on Trump, Biden: Big turnout, few hiccups, Kapor Center polling station puts out West Oakland welcome. The best practice is to choose a resistant variety of crape myrtle and plant it in the sun. Post was not sent - check your email addresses! The University of California has additional information on managing powdery mildew on ornamentals and general care and pest management for crape myrtles at www.ipm.ucdavis.edu. Of the sulfur products, wettable sulfur formulated with a surfactant is the simplest and most effective for the home gardener. The leaves are dark purple to burgundy to black! The University of California has additional information on managing powdery mildew on ornamentals and general care and pest management for crape myrtles … Under favorable conditions, infection may occur as few as 3 to 5 days after the spore lands on the crape myrtle. Educational programs of the Texas AgriLife Extension Service are open to all people without regard to race, color, sex, disability, religion, age, or national origin. The ascoma (also known as the clietothecia) is a small dark spherical structure about the size of a small poppy grain, and are easily observed amongst the whitish mildew. Eradicants can help manage an infection after it has started. Additionally, crape myrtle should be planted in sunny locations allowing free air movement so wet foliage dries quickly. Sulfur has been used to manage powdery mildew for centuries, but it is effective mainly as a preventive. Presenter: Melissa King. CLICK HERE TO TURN ON NOTIFICATIONS. Yet in the spring and fall months, some leaves appear to turn grayish white. Never apply oils to water-stressed plants or when the temperature is higher than 90 degrees. They may cover new growth entirely and cause severe damage to these parts. Molly K. Weden is a Contra Costa Master Gardener. Many have Native American nation names, such as “Catawba” (purple flowers, 15 by 15 feet), “Cheyenne” (red flowers, 10 by 10 feet) or “Natchez” (white flowers, 20 by 20 feet). Q: I have a crape myrtle and every year it is covered in a whitish powder. Warm days and cool nights (60° – 80°F) reportedly favor development and spread of powdery mildew. These growth and spores give it the powdery-like appearance, hence the common disease name “Powdery Mildew”. Title: Diamonds in the Dark – Crepe Myrtles All Access Digital offer for just 99 cents! Badly infected leaves may grow abnormally (curl and twist). Powdery mildew spores can germinate and infect crape myrtle in the absence on free water on the plant tissue, as long as there is adequate humidity in the air. These varieties are highly resistant to powdery mildew and are very low maintenance, so they look fabulous for very little effort. This series of small crape myrtles is colorful and unique. Potassium bicarbonate is available to licensed applicators only. It is evidenced by white fuzz on leaves and shoots. Crape myrtles need plenty of sun and air circulation to help fight this disease. A: Powdery mildew is a plant disease caused by a fungus, Erysiphe lagerstroemiae. Infected shoots may dry up and shrivel. This fungus grows in thin layers on the surface of leaves, shoots, buds and flowers. Powdery mildew grows best on young, actively growing plant tissues. Purely Purple is smothered in vibrant purple flowers. Fungicides are typically not needed at the hottest part of the year as the powdery mildew fungus is inactive and the fungicides may cause damage to the plants. A unique education agency, the Texas A&M AgriLife Extension Service teaches Texans wherever they live, extending research-based knowledge to benefit their families and communities. This disease has a powder-like appearance on the infected surface. There are numerous fungicides, both natural and synthetic, that are available to control powdery mildew. The UC Cooperative Extension Master Gardener Help Desk is staffed 9 a.m. to noon Monday-Thursday, 925-646-6586, firstname.lastname@example.org. The most effective way to control powdery mildew is to prevent it. Less toxic fungicides are available including horticultural oils, neem oil, jojoba oil, sulfur, potassium bicarbonate and biological fungicides. Episode: 1 Under favorable conditions, infection may occur as few as 3 to 5 days after the spore lands on the crape myrtle. Never apply oils within two weeks of an application of sulfur, and never apply sulfur within two weeks of an application of oil. Get Morning Report and other email newsletters. These varieties are highly resistant to powdery mildew and are very low maintenance, so they look fabulous for very little effort. Shell Pink has beautiful coral pink blooms. www.touchofclassplants.com.au, The Way to have Green Grass Through Winter. Biological fungicides are available commercially. The flowers come in a variety of colors including pink, red, purple, and white. Thinking beautiful trees in the garden? The ascoma survives the winter on leaves or plant debris, and will produce spores in the spring to that can reinfect the crape myrtles. The information given herein is for educational purposes only. The best way to avoid powdery mildew is to plant one of the cultivars bred and selected for resistance to powdery mildew. Except for the oils, these materials are primarily preventive. Place crape myrtle trees in full sun, with enough space around them so they are not crowded. The next best practice is to spray with a preventive fungicide early on. Often the leaves are stunted and distorted. Preventive treatments are applied to susceptible plants before any sign of the disease. Powdery mildew spores are disseminated by wind. Powdery mildew (Erysiphe lagerstroemiae) is a fungus. Natural fungicides such as Neem oil extract and Potassium bicarbonate has been shown to be effective when used correctly.