This is my false spirea today. Most leaf spot diseases affect only a small percentage of the tree's overall leaf area, and are a minor stress on the health of the tree. Spray healthy foliage every 7 to 10 days with a general garden fungicide to protect it from the spread of the infection.Click here for more information on Controlling Fungal DiseaseFoliage Burned by Dog UrineDog urine is mildly toxic to most ornamental plants, as well as lawns. Click here for more information on Controlling ScaleLeaves and Twigs Die Back Due to Fire BlightThis bacterial disease is spread by insects and rain. âSnowmoundâ is a 7-foot tall version that has less disease. Spirea generally aren't bothered by any serious pest or disease problems. Some species of scale excrete honeydew, which attracts ants and encourages the growth of sooty mold on the leaves. They do, however, want to be in at least part sun and, like most plants, youâll get the best flowering in more sun. Q. Spirea Out Of Control - About 4 to 5 years ago, I moved several perennials from my deceased parents yard to mine. Birchleaf spirea is a great small, rounded shrub, reaching 3 to 4 feet high. Their feeding retards plant growth, and causes the leaves to curl and turn yellow. My Spirea Bush Is Dying Verticillium Wilt. Mulching helps prevent splash-borne infection in outdoor plantings. False-spirea is a dense, colony-forming, suckering shrub best used for naturalizing, erosion control. They sometimes cluster in large masses on tender new leaves and buds of spirea. Spirea Problems Spirea. âGoldflameâ is a gold leaf spirea with light pink blooms. They suck sap from plant foliage protected by rounded waxy shells which make telltale bumps on stems and leaf undersides. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. Leaves Coated with White Powder Due to Powdery MildewPowdery mildews caused by various fungi sometimes attack some kinds of spireas, coating their leaves and growing tips with whitish patches. How to Care for the Plant Called Minuet Weigela, How to Cure Hydrangea Anthracnose Disease, University of Illinois Extension: Bridalwreath Spirea, University of Illinois Extension: Japanese Spirea, University of Illinois Extension: Bumald Spirea, University of Illinois Extension: Spirea Aphid. However, they are related to roses and can be susceptible to the same pests and diseases as roses, such as leaf spot, powdery mildew and aphids. As a preventive measure, you can spray your spirea with a bactericide containing streptomycin or Bordeaux mixture while the plant is blooming. May be difficult to find in local nurseries. They will ingest the bacterium and later die. Do You Need to Pinch Back Calliope Geraniums? Potential diseases include: fire blight, leaf spot, powdery mildew, and root rot. Spiraea thunbergii, called Thunberg spirea, babyâs breath spirea or breath of spring spirea, is a dense, twiggy, upright, deciduous shrub with wiry, outward-arching branching.It typically grows 3-5â tall and as wide, often becoming somewhat open and leggy over time. Save Beloved by greenhorn and green thumb gardeners alike, their multi-season beauty, easy care, and fast growth make it one of the most popular of flowering shrubs. In early to late summer, a profusion of small, flat clusters of tiny white flowers cover the foliage of birch-like, round to egg-shaped, dark green leaves, 2 in. Leaf spot diseases may affect spirea but are also not especially damaging to the health and appearance of the tree. This attractive shrub has a late winter and spring interest. All spirea plants are susceptible to the same problems. This disease is rarely serious unless the spirea is planted near pears, apples or hawthorns which are also susceptible to it. Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to four years in a row. Extensive summer leaf drop may follow. Optimum conditions for growth. Noted for its dazzling foliage, Spiraea betulifolia 'Tor' (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. Inspecting their undersides reveals yellowish, waxy spore masses. Spirea leaves with both surfaces exhibiting light-yellow lesions that darken over time suffer from Cylindrosporium filipendula leaf spot. Insects, Diseases, and Other Plant Problems: This plant may be damaged by deer. To think, I once considered spirea to be âvan ordinaire.â They develop yellowed or bronzed foliage, then they decline slowly and die. âSemâ Ash Leaf Spirea, Ural False Spirea, False Spirea âSamâ, Sorbaria sorbifolia âSemâ â all these are names for the same shrub, native to Eastern Siberia, Manchuria, northern China, Korea and Japan. 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