For more information about crape myrtle varieties: Aggie Horticulture – Information about varieties that have powdery mildew resistance and are good choices for Texas. Treat mildew by improving the air circulation in your crepe myrtle's canopy, or the upper- and outer-most areas of the tree's leaves. Severe infection also causes premature defoliation. Use crape myrtle varieties that are resistant to powdery mildew. 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. 1). Gardening Know How: Can Crepe Mrytle Grow in Zone 5? Mildew thrives in warm, moist conditions. Otherwise, prune sparingly to maintain the tree's natural shape. The crape myrtle (Lagerstroemia spp.) Her articles appear on various websites. Alternate using formulas with different active ingredients to prevent the crepe myrtle from developing a resistance to any one kind of fungicide. Avoiding excess fertilization also helps reduce susceptibility to powdery mildew. Older leaves are less likely to be affected, but can become infected under conditions favorable for the disease. Powdery mildew occurs most often on young, actively growing plant tissues (Fig. A variety of chemicals can control powdery mildew, including neem oil, sulfur-based sprays, propiconazole, potassium bicarbonates and tebuconazole. FYI, there are lots of different kinds of powdery mildew and they attack many different plants -- bee balm, lilacs, euonymus, phlox, squash, roses, etc. Warm days and cool nights (60° to 80°F) favor development and spread of powdery mildew. Prevention is the best management method. Garden Safe – Best Organic Fungicide for Powdery Mildew. The ascoma survives the winter on leaves or plant debris and produces spores in the spring that can re-infect crape myrtles. The surface of an infected plant has a powder-like appearance (Fig. Mildew thrives in warm, moist conditions. She is a member of the Society of Professional Journalists and was a college reference librarian for eight years. The crepe myrtle, sometimes spelled crape myrtle or crapemyrtle, is a large, flowering tree. The crape myrtle (Lagerstroemia spp.) Do you have a question -or- need to contact an expert? Spray your crepe myrtle with fungicides as soon as you see mildew on the leaves. (Crape Myrtle), University of Florida IFAS Extension: Lagerstroemia Indica: Crapemyrtle, Bowood Farms: Lagerstromea/Crape Myrtle: Planting and Care Instructions, HGTV: Choosing the Right Crape Myrtle for Your Landscape. We have intentionally placed the review of the most effective fungicide at the end of the review because its the diagnosis which comes first and foremost. All Rights Reserved. But if you live in a colder climate, there are many hybrid crepe mytles that can survive in zone 6, and some can survive in zone 5 if they're planted in a protected area. To remedy this situation, you will need to apply fungicide. Depending on the severity of the disease, you may need to apply fungicides every week or two. Mildew is a fungus. Moreover, it can be applied for indoor plants and utilized every day before harvesting. Download a printer-friendly version of this publication: Powdery Mildew on Crape Myrtles, View more Gardening & Landscaping information ». Older leaves are less likely to be affected, but can become infected under conditions favorable for the disease. Garden Safe is a 3-in-1 formula tripling up as an antifungal, insect powder, and a miticide. These Southern favorites provide shade, and feature attractive, peeling bark and are easy to care for. This change may be a sign of powdery mildew, a disease common to crape myrtles. Plan the perfect garden with our interactive tool →, Mississippi State University Extension: Powdery Mildew on Crape Myrtle, North Caroline State University Cooperative Extension: Crapemyrtle aphid, University of Georgia Cooperative Extension: Crape Myrtle Culture, University of Calfiornia Sonoma County Master Gardeners: Lagerstroemia Spp. Application intervals vary; if the aphids reappear, treat the tree again to prevent another round of black mold. You may use a generic fungicide that contains propiconazole, tebuconazole, thiophanate-methyl, myclobutanil or triadimefon. And that's what crepe murderers have helped to do this year. The white powder that comes from the leaves of an affected Crape Myrtle are the spores mildew releases in order to reproduce. It can completely cover and severely damage new plant growth. Follow the instructions included with your fungicide of choice. To determine the amount of fertilizer for an established tree, measure the ground under the widest part of the canopy, or top of the tree, then provide 1/2 pound of fertilizer for every 100 square feet. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Hi i am Waqar Zafar, a passionate plant pathologist. Shorten excessively long outer branches. 3), and badly infected leave… AgriLife Extension: Powdery Mildew on Crape Myrtle ; University of California Integrated Pest Management Program: Powdery Mildew on Ornamentals Once the roots are established, the tree rarely requires supplemental water. Under favorable conditions, infection may occur as few as 3 to 5 days after the spore lands on the crape myrtle. Crepe myrtle (Lagerstroemia Indica) is a popular, easy to grow tree in the right setting. Pruning depends on the desired size and shape of the tree. Depending on the severity of the disease, you may need to apply fungicides every week or two. • 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. Wait a day or two to water if the soil feels cool and moist. This fungal growth results in a powdery appearance on the plant surface, hence the common disease name, powdery mildew. 2), infected shoots may dry up and shrivel, severely affected buds will drop off (Fig. Its deep green foliage and bright-colored blooms last throughout the summer and its interestingly textured trunk accents the landscape in winter. What is the best Fungicide for Powdery mildew? The best way to prevent powdery mildew on crape myrtles is to grow resistant varieties in open, airy sites that receive at least six hours of direct sunlight every day. Texas A&M Veterinary Medical Diagnostics Laboratory, Texas A&M College of Agrculture and Life Sciences. The crepe myrtle, sometimes spelled crape myrtle or crapemyrtle, is a large, flowering tree. Always read all directions and labels before using any chemical control. Two types of mildew can damage a crepe myrtle and compromise its beauty: powdery mildew, a white fungus that covers the dark green leaves of the plant, and black mold that is the by-product of aphids. The North Carolina State University Cooperate Extension reports that chemicals effective against aphids include insecticidal soap, horticultural oil, pyrethroids and organophosphate. However, crepe myrtle benefits from an occasional watering during hot, dry weather, especially while the tree is blooming. I have done graduation Plant pathology and animal science. Disease development slows when leaf temperatures exceed 90°F. Some fungicides, both natural and synthetic, are available to help control powdery mildew. Learn which plants thrive in your Hardiness Zone with our new interactive map! genus of trees and shrubs are reliably hardy in zones 6 to 9, depending on the species, variety or cultivar. It can completely cover and severely damage new plant growth. It grows in thin layers on the surface of buds, flowers, leaves, and shoots. Crepe myrtle needs to be watered regularly for the first two months. It produces numerous spores that, when seen under a microscope or hand lens, look like chains of beads. 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. Spray your crepe myrtle with fungicides as soon as you see mildew on the leaves.
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