The spores and mycelia of powdery mildew are sensitive to extremes of heat and sunlight. Crepe myrtle leaves turning brown—with the whole leaf turning brown or browning along the edges and sometimes accompanied by curling—is different from the emergence of brown spots in the middle of the leaf. Initial symptoms on crape myrtles are the appearance of dark brown spots that develop first on the lower leaves and progress upward in the canopy from midsummer through fall. Since then, it spread rapidly. Tweet. D.F., Houston. I was going to plant some new boxwoods and perennials in the bed, and put down new mulch & decorative rock. These trees bloom later in the summer, around June, so you won’t see crape flowers as early as you see roses or gardenias in your garden. Crape Myrtle Trees need at least six hours of sunlight a day in order to bloom. To lower the acidity, add sulfur. I was just about to remodel my front flower bed when I discovered the white bark disease bugs on my crepe myrtle tree. Measure the pH balance of your soil with a pH tester, which can be found at your local gardening store. • 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. Powdery mildew on ficus plants can produce symptoms such as a white fungal coating on leaves and stems, twisting leaves, small leaf size and premature leaf drop. Local garden center recommended "Natural Guard Neem Oil by ferti-lome". They’re noticeable because their organic material causes the bark to turn black with sooty mold. Thanks to their drought tolerance and heat resistance, they continue to bloom through harsh conditions. Question: It looks like it’s raining from my crape myrtle leaves. This is one of the most common diseases contracted by crepe myrtle trees. emCercospora leaf spot. Crepe myrtles are deciduous, flowering profusely with compact crepe-like blooms throughout the hot summer months, then losing their leaves in late Autumn to show off, another draw card, its textured bark. They definitely are not insects. Instead, it grows on sticky honeydew secreted by sucking insects like aphids, scales, and white flies that do feed on the leaves. Sooty mold is a fungus that covers the leaves and looks like you just sprayed your crepe myrtle with asphalt. Unfortunately, you must have one of the older varieties that is not powdery mildew resistant. Crape myrtles need plenty of sun and air circulation to help fight this disease. Spray your crepe myrtle with fungicides as soon as you see mildew on the leaves. I mixed it 3 oz to 1 gallon and sprayed it on the tree and underside of the leaves. Ask Nancy > Crepe Myrtles Are Covered With Sticky Residue And White Powdery Substance. The Crape Myrtle prefers slightly acidic soil with a pH ranging from 5.0 to 6.5. ©2020 Walter Reeves / The Simple Gardener, Inc. All Rights Reserved. Plus, Crape Myrtle Trees are tough. Local garden center recommended "Natural Guard Neem Oil by ferti-lome". They’re noticeable because their … The disease is most serious in shady, damp locations, especially where plants … When crepe myrtle leaves turn yellow, orange, and red, it means fall must be on the way. But I deep watered any way. The scales also reproduce on the shrubs, with each female laying dozens of pink eggs. For the brightest blooms, use a fertilizer that’s high in phosphorous. Guttation takes place under conditions of high relative humidity and low transpiration (moisture release through leaf stomates). If you wish, you can cut them back much harder than this – they ’ ll send out long arching branches from the site of the cut when spring arrives. At this stage heavy defoliation occurs. In the rare case that your tree develops an issue, here are a few quick and simple solutions to quickly restore its full health. I tasted the crystals myself and found them to be salty/sweet, as expected. If your crepe myrtle was planted in a shady area as opposed to a sunny area, it can be especially susceptible to contracting this disease. Various leaf spot fungi cause yellow, brown or black dead blotches on crape myrtle leaves. However, the Crape Myrtle does boast a higher resistance to pests and diseases than other flowering tree varieties, and when they are affected, the issues are easy to mediate quickly. Its deep green foliage and bright-colored blooms last throughout the summer and its interestingly textured trunk accents the landscape in winter. Crepe myrtle roots travel far and wide, spreading three … A short video describing the black spot disease of crape myrtle. Heavily infected leaves then turn yellow or brown and fall prematurely. Heavy infestations of crape myrtle bark scale are easy to spot and identify: Look for crape myrtles with heavy accumulations of black sooty mold on the leaves, limbs, and trunk.