Leaf Spot on Crape Myrtles « Back to Name that Plant. Dallas Red Myrtle – 15 to 20 feet. OUT DAMN SPOTS: Many crape myrtles are dropping yellow or red leaves with spots on them. The fungus that cause this crepe myrtle disease attacks mostly during the warm moist weather and this can cause so much harm to the tree to almost completely defoliate. It is very likely too soon to add more fertilizer, but you can check the label of the product you used. This is especially true in large plant nurseries and residential or commercial landscapes that use overhead irrigation frequently. Cercospora leaf spot will cause tan to dark brown spots which will be randomly scattered on leaves Severely affected leaves turn yellow with areas with large lesions. Eliminate scales with a solution of 2 tablespoons, or the label's specified amount, of liquid permethrin concentrate in 1 gallon of water. It doesn't usually harm … Pathogen cycle: These fungi survive adverse conditions in leaves in the canopy and in fallen leaves. If it says to apply it every three weeks, go ahead and fertilize. Thank you. Satisfactory exfoliating bark. More information on successfully growing crape myrtles is available in HGIC 1008, Crape Myrtle, and HGIC 1009, Crape Myrtle Pruning. The problem that I am seeing is a fungal leaf spot known as Cercospora leaf spot. Cercospora leaf spot is a fungal disease that affects crops, ornamental plants, shrubs and flowers. OUT DAMN SPOTS: Many crape myrtles are dropping yellow or red leaves with spots on them. Excellent resistance to leaf spot and powdery mildew. Cercospora leaf spot is a very common fungal pathogen of crapemyrtle. Most gardeners consider deadheading crape myrtle trees more trouble than it is worth, and many trees are too tall to make this practical. Crape Myrtle leaf drop. Arkansas Plant Disease Control Products Guide - MP154 See Ornamental Disease - Home Garden for recommendations of products to help control diseases on crapemyrtles. Fungal leaf spots caused by Cercospora lythracearum may appear on crape myrtle foliage during periods of warm, moist weather. Notes: I have lots of Natchez crape myrtles that have what I think is cercospora leaf spot on them. Cercospora leaf spot of crape myrtle beginning as tiny flecks on lower surface of 4 uppermost leaves and large irregular, brown spots coalescing and causing distortion of the larger lower leaves on the right. Arkansas Plant Disease Control Products Guide - MP154 Crape myrtle aphids are quite common, and most trees get them during summer. To prevent Cercospora leaf spot on a small crepe myrtle, a fungicide, such as Daconil, should be sprayed by Aug. 1. Common problems are crape myrtle aphids, powdery mildew and Cercospora leaf spot. After the flower clusters of crape myrtles fade and the flowers drop off, you will see clusters of green balls. The traditional crape myrtle (Lagerstroemia indica) is susceptible to both powdery mildew and cercospora leaf spot. Posted 21 August 2010. Trim them if you like, but it won't hurt to leave them. Source: Louisiana State University Press Release. Global Posts, Institute of Food and Agricultural Sciences and University of Florida, P.O. www.lsuagcenter.com Baton Rouge, Louisiana (August 11, 2010)--A hot and wetter-than-normal summer has lead to an increase in the major disease problem on crape myrtles in south Louisiana, says LSU AgCenter horticulturist Allen Owings. You know what's going on but you also know it's too late to spray this ___ to do anything and that the disease overall is not that debilitating to your tree. So when you look over your crape myrtle trees here in the mid to late summer period and you see a lot of leaves changing color and the weather has been rainy. After all the rain, the grass has turned a lighter green. Twilight purple crape myrtle reaches over 40 feet tall. Patches of white to grayish powdery growth occur on the surfaces of leaves, flowers and new shoots. These are all practical goals in younger or smaller growing crape myrtles where the seedpod clusters are easy to reach. There are two serious and common fungal diseases on crapemyrtle: powdery mildew (Erysiphe lagerstroemiae) and Cercospora leaf spot. Crape myrtles (Lagerstroemia indica) are essentially trouble-free small trees. The infection causes dark-olive to black-colored spots on the leaves, which then turn red, orange or yellow and fall off. Most products have a short control period. -- Kevin. Heavily infected flowers may fail to open. A related species, Pseudocercospora causes similar spots. Twilight Purple Crape Myrtle: Twilight is the large purple crape that is most coveted. Crapemyrtle leaves with advanced leaf spot. The most common problems include powdery mildew, Cercospora leaf spot, aphids, Japanese beetles and sooty mold. -- Kevin. What happens is that in mid- to late summer, angular, brown spots form on the oldest leaves. Crape myrtle bark scale; Crapemyrtle Fungal Diseases. Approximately 1000 seedlings were generated from crosses between susceptible and resistant crape myrtle parents by the Priciple Investigator. Last year's fallen leaves are the main source of the problem. Powdery Mildew of Crape Myrtle can be seen as early as mid-April, but it is much more common in June, when the dryer weather, warm days and cool nights create the perfect conditions for its spread. Cercospora Leaf Spot of Ligustrum. My crape myrtle tree seems to have some fungus. Leaves and young shoots are heavily coated with a powdery, white mold, and may become distorted. You have permission to edit this article. 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