Susceptible to many of the diseases and insects that attack other rose family members, including leaf spot, fire blight, powdery mildew, root rot, aphids, leaf roller and scale. Bushes with acute verticillium wilt show signs of drying leaves or browning, curling and wilting... Fire Blight. Insects, Diseases, and Other Plant Problems: This plant may be damaged by deer. Fireblight is named for the black coloring that develops on host trees, giving them a scorche… If the bush is not pruned to... Plant Hardiness. When leaf spot does occur, it is most often caused by Entomosporium maculatum, which is common in members of the rose family. Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. It is rare, however, for these problems to kill a spirea. 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. To protect healthy foliage on an infected shrub from the spread of the mildew, spray it thoroughly with a general garden fungicide containing sulfur according to instructions on its label. Wait until fall to fertilize your spireas, because feeding them in spring stimulates... Powdery Mildew. Bridalwreath spirea (Spiraea prunifolia), which can grow up to 8 feet tall, is typically the earliest to bloom, with round-clustered white flowers that cover the arching branches in spring. Japanese spirea (Spiraea japonica) grows up to 5 feet tall with flat clusters of pink to red flowers that bloom in summer. Victoria Lee Blackstone is a horticulturist and a professional writer who has authored research-based scientific/technical papers, horticultural articles, and magazine and newspaper articles. Spirea Problems Spirea. 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. To think, I once considered spirea to be “van ordinaire.” If the aphids are all over the shrub, spray them directly with an insecticide product featuring insecticidal soap according to label instructions. Nematode activity is most obvious in hot weather, when wilting shrubs fail to recover from the heat.Control nematodes by adding lots of compost (especially leaf mold) to the soil around the spirea plants to encourage beneficial fungi that attack nematodes. The three primary species of this deciduous shrub reflect different growth forms and bloom times. This removes the dead blossoms and also may trigger a second blooming and new leaf growth. Optimum conditions for growth. Pour diluted liquid fish emulsion onto the soil around affected roots. It's a carefree, vigorous grower, and matures at 3 to 4 feet tall and … ‘Sem’ Ash Leaf Spirea, Ural False Spirea, False Spirea ‘Sam’, Sorbaria sorbifolia ‘Sem’ – all these are names for the same shrub, native to Eastern Siberia, Manchuria, northern China, Korea and Japan. The first sign is a slight stippling of dots on the leaves, after which the leaves turn yellow and drop off. Leaf spot diseases may affect spirea but are also not especially damaging to the health and appearance of the tree. They are recognized by their abundant flowering in whites, pinks, or reds. Infested new growth in spring is stunted and severe infestations can kill a young shrub. Spiraea thunbergii, called Thunberg spirea, baby’s breath spirea or breath of spring spirea, is a dense, twiggy, upright, deciduous shrub with wiry, outward-arching branching.It typically grows 3-5’ tall and as wide, often becoming somewhat open and leggy over time. They protect themselves while feeding by rolling leaves into tubes and binding them with strands of silk. False-spirea is a dense, colony-forming, suckering shrub best used for naturalizing, erosion control. It grows 3 feet tall and wide. 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. are deciduous shrubs that grow 2 to 6 feet tall depending upon species and variety. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. While this disease is not fatal, it does mar the appearance of the shrub. Follow the instructions on the package label. After each cut, dip your pruning tool into a 10 percent chlorine bleach solution to sterilize it. As a preventive measure, you can spray your spirea with a bactericide containing streptomycin or Bordeaux mixture while the plant is blooming. Like other members of the rose family, spireas are susceptible to various pests and diseases, but most are not serious. Too much or too little water can stress plants. Noteworthy Characteristics. Diseases: Phytophthora or Pythium root rots could occur in poorly drained, wet soils, but these soils should be avoided for almost any type of shrub. They suck sap from plant foliage protected by rounded waxy shells which make telltale bumps on stems and leaf undersides. Too much water can cause leaves to turn yellow or entire stems to die, which may give you a false signal your plant needs more water. No serious insect or disease problems. This disease is rarely serious unless the spirea is planted near pears, apples or hawthorns which are also susceptible to it. No known serious insect or disease problems. And ones that add pretty flowers, luminous foliage, and multi-season color give even greater value – like spirea. She is also a former mortgage acquisition specialist for Freddie Mac in Atlanta, GA. How to Get Rid of Bugs & Fungus on Camellias. Spread fresh mulch for the winter.Click here for more information on Controlling Fungal DiseaseDiscolored Blotches on Leaves Caused by Fungal Leaf SpotYellow, brown or black blotches, which frequently run together, appear on leaves affected with fungal leaf spot. Do not over fertilize, because excess nitrogen makes the shrub more blight-prone. Pick off and discard infected leaves. If you plant different varieties of spirea (Spiraea spp. Fire Blight. Cut down and trash (do not compost) seriously infected shrubs together with the soil ball. Black sooty mold growth hinders photosynthesis, which impairs the spirea's ability to manufacture its food. Gold Mound Spirea - I just purchased some gold mound spirea for planting and they looked great a week ago, and now the leaves ... Q. Large, showy clusters of tiny white flowers appear in mid-summer. Spray shrubs with a streptomycin antibiotic wettable powder product to protect blossoms. ‘Anthony Waterer’ is a popular 4 to 5 feet tall and wide spirea with pink-rose colored blooms and reddish fall foliage color. Infested roots are poorly developed, show knots or galls, and may be partially decayed. This is my false spirea the day I planted it less than two years ago. Mulching helps prevent splash-borne infection in outdoor plantings. Also, it doesn't burn in the summer and has great fall color. Remove dead or dying shrubs with the soil around their roots and discard them in the trash. They may taste it or chew a leaf or two, but generally the plant is not their primary source of food. 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. Reportedly has good resistance to powdery mildew. Fire blight (Erwinia amylovora) bacteria oozing from cankers on previously infected spirea branches migrate... Fire Blight Control. Do You Need to Pinch Back Calliope Geraniums? If you notice any of these symptoms, look for the scale insects themselves. Lovely yellow-hued birch leaf spirea Dense, petite habit (just 3-4’ tall and wide!) Spirea shrubs are easy to grow and grow in almost all climatic zones. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. A bacterial disease and poor water management round out the primary problems of spirea, but a little environmental housekeeping may keep your plants healthy. Since most types of spirea rarely have pest problems, consider if yours may be under stress which makes it vulnerable, and address this situation.Click here for more information on Controlling AphidsLeaves Rolled into Tubes by LeafrollersLeafrollers are the larvae of small moths. It is toxic to nematodes. Also try screening the plants or spraying foliage with a repellent spray. Like many members of the rose family, spirea is susceptible to infection of fireblight, but damage is not usually significant. It has grown to over 6 feet tall and spread to … Fire blight is a bacterial disease caused by the pathogen Erwinia amylovora. The spirea aphid (Aphis citricola) occurs in all areas of the U.S., notes University of Illinois Extension. Adult moths are brown or gray, 1/4 to 1/2 inch long. It holds its color throughout the summer and turns a coral-orange in the fall. Some species of scale excrete honeydew, which attracts ants and encourages the growth of sooty mold on the leaves. The spots are small that typically measure 1/8 to 1/4 inches in diameter. Stems, Leaves Encrusted with Small Bumps Indicate ScaleThe first sign of a scale attack is that some of the spirea’s leaves turn yellow, then drop off. As powdery mildew continues, fungal growth encompasses more and more plant tissue. Problems. This attractive shrub has a late winter and spring interest. The early summer white flowers, dark green, birch-like leaves turn a kaleidoscope of red, orange, and purple fall color adding seasonal interest and great for butterfly gardens and the front of the shrub border. THRIPS. You can easily distinguish leaf spot diseases from spots caused by winter injury or ice that focuses sunlight, burning the leaves.Cool, moist weather promotes fungal diseases, especially when new leaves are developing. Inspecting their undersides reveals yellowish, waxy spore masses. Pretty red buds open to bright white flower clusters Special features: Foliage interest, disease resistant, hardy, heat tolerant, beneficial to pollinators, clay soil, drought tolerant No known serious insect or disease problems. ‘Magic Carpet’ Spirea is deer-resistant, which means the plant is not a normal part of their diet. Jets of water from your garden hose dislodge aphids, but in severe infestations, you can use insecticidal soaps to control these pests. Spirea generally aren't bothered by any serious pest or disease problems. Hi Barbara-The red spots on your spirea leaves are most likely a fungal disease. SYMPTOMS: Silver or bronze colored streaks on leaves, which eventually turn brown, … Spiraeas are generally susceptible to many of the diseases and insects that attack other rose family members, including leaf spot, fire blight, root rot, aphids, leaf roller and scale. See this plant in the following landscape: Deer don’t give spireas a single look, which is always worth an extra star in my book and I’ve not found them to be affected much by other bugs or common diseases. Spirea Aphid. It may discolor spirea foliage and even kill lower branches that dogs visit repeatedly. The removal of affected leaves and stems, and the application of a chemical fungicide or a biofungicide may halt the spread of some. In late spring to early summer, a profusion of small, flat clusters of tiny white flowers cover the foliage of birch-like, dark green leaves. Prolonged exposure to waterlogged soil can cause roots to suffocate or rot. Shake out all fallen and diseased leaves from the center of the shrub and destroy them. Collect and discard all dead leaves, branches and mulch in the fall to reduce overwintering mildew spores. You can also shape the shrub at this time. Spiraea cantoniensis -- Reeve’s Spiraea Page 2 October 1999 Figure 2. This primary insect pest feeds on cell sap by piercing plant tissue and siphoning the liquid. Do Spirea Bushes Scare Off Birds, Squirrels - Just planted a 4-gal. For more information see the file on Dealing With Dogs and Cats, Newly Planted Princess Spirea Turned Purple Black After Snow, Seemingly Healthy Spirea Buds Do Not Bloom, Spirea Bush Has Larger And Greener Leaves But No Flowers, Can A Spirea Be Planted Where There Was A Spirea With Fire Blight Removed, Spirea Is Infested With 7mm Shelled Insect With Black Wings And Small Yellow Stripe Down The Middle Of Its Wing, Spirea Have Some Dead Branches With Small Blue Spots, Spirea Bushes Have Foam Dripping On Stems, Spirea Branches Breaking Off And Some Plants Have Leaves Only On Bottom. Because Bt is rapidly inactivated by sunlight and rain, you may have to repeat the spray. Virtually indestructible, Spiraea betulifolia (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. Ants, attracted by the aphids' honeydew secretions, wander over the plants and protect the aphids from natural predators. Bumald spirea (Spiraea x bumalda) is a low-growing summer- to fall-blooming species that grows up to 3 feet tall and bears white or pink flowers. If you have a deer problem at your house, this plant might be a perfect choice for your garden. 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. Spirea leaves with both surfaces exhibiting light-yellow lesions that darken over time suffer from Cylindrosporium filipendula leaf spot. Fire blight causes the branches affected by the disease to appear scorched. Webbing may appear all over the plant and damage worsens with water stress. Noted for its dazzling foliage, Spiraea betulifolia 'Tor' (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to four years in a row. Control larger infestations by spraying or dusting foliage with a product containing Bacillus thuringiensis, or Bt, as soon as you see the feeding caterpillars and the rolled leaves on your spirea. Simply scrape small patches of bumps off spirea leaves or stems with your fingernail or a cotton swab dipped in rubbing alcohol. Most were just ... Q. Are ‘Magic Carpet’ Spirea Deer Proof? Eliminate nearby ant nests if possible. If there are not too many leafrollers, handpick the larvae in their leafy tubes and crush them. The National Gardening Association touts spirea as one of the easiest flowering shrubs you can grow. 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. Powdery mildew is a common disease of a variety of landscape trees, flowers and shrubs. If your plant succumbs to this disease, immediately prune all affected stems at least 10 inches below the infection and destroy them. Gold Thread™ Spirea Spiraea thunbergii 'Ogon' This spring bloomer has white flowers over chartreuse, willow-like leaves. Spirea is also known by the scientific name Spiraea japonica and is a member of the Rosaceae family.

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