As a preventive measure, you can spray your spirea with a bactericide containing streptomycin or Bordeaux mixture while the plant is blooming. Leaf venation: pinnate Current year stem/twig thickness: thin Leaf type and persistence: deciduous Leaf blade length: less than 2 inches Leaf color: green Fall color: yellow Fall characteristic: showy Flower Flower color: white Spirea Diseases Fire Blight. Virtually indestructible, Spiraea betulifolia (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. Infested roots are poorly developed, show knots or galls, and may be partially decayed. They may taste it or chew a leaf or two, but generally the plant is not their primary source of food. Do Spirea Bushes Scare Off Birds, Squirrels - Just planted a 4-gal. Spider Mites. âMagic Carpetâ Spirea is deer-resistant, which means the plant is not a normal part of their diet. Spray shrubs with a streptomycin antibiotic wettable powder product to protect blossoms. âAnthony Watererâ is a popular 4 to 5 feet tall and wide spirea with pink-rose colored blooms and reddish fall foliage color. This is my false spirea today. It grows 3 feet tall and wide. They do, however, want to be in at least part sun and, like most plants, youâll get the best flowering in more sun. âSnowmoundâ is a 7-foot tall version that has less disease. 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. 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. Spireas are generally 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. No known serious insect or disease problems. Prolonged exposure to waterlogged soil can cause roots to suffocate or rot. Also try screening the plants or spraying foliage with a repellent spray. Spirea Problems Spirea. There is conflicting data on the level of tolerance the plant has for deer. Spiraea spp. © Copyright 2020 Hearst Communications, Inc. Remove dead or dying shrubs with the soil around their roots and discard them in the trash. More information on Spiraea x bumalda. You can also shape the shrub at this time. Birchleaf spirea is a great small, rounded shrub, reaching 3 to 4 feet high. 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. The large compound leaves open on arching stems, unfolding with a reddish tinge gradually changing to â¦ Black sooty mold growth hinders photosynthesis, which impairs the spirea's ability to manufacture its food. Prune out damaged areas to stimulate regrowth of new, healthy stems and foliage. Some fungal spots are surrounded by flecks or black dots, the spore-bearing fruiting bodies. The spirea aphid (Aphis citricola) occurs in all areas of the U.S., notes University of Illinois Extension. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. 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. Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. University of California Statewide Integrated Pest Management Program: Spirea -- Spirea Spp. Fire blight causes the branches affected by the disease to appear scorched. Chemical management is generally ineffective once this disease takes hold. Pour diluted liquid fish emulsion onto the soil around affected roots. To think, I once considered spirea to be âvan ordinaire.â Like other members of the rose family, spireas are susceptible to various pests and diseases, but most are not serious. Because Bt is rapidly inactivated by sunlight and rain, you may have to repeat the spray. 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. Blackened stem tips curve into a characteristic shepherd’s hook. Leaf spot diseases should be taken seriously if they result in moderate to complete leaf loss two to four years in a row. You should actually prune your spirea more than once a year, at least twice. 1a. Pick off and discard infected leaves. If there are not too many leafrollers, handpick the larvae in their leafy tubes and crush them. If you dig gently down to the root zone, you may discover your spirea’s need for better drainage, rather than more water. This disease is rarely serious unless the spirea is planted near pears, apples or hawthorns which are also susceptible to it. Wait until fall to fertilize your spireas, because feeding them in spring stimulates... Powdery Mildew. 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. They sometimes cluster in large masses on tender new leaves and buds of spirea. With a long-lasting bloom time, fine-textured foliage, and variable sizes, theyâre suitablâ¦ Like many members of the rose family, spirea is susceptible to infection of fireblight, but damage is not usually significant. Woody shrubs give wonderful structure to gardens and landscapes. Follow the instructions on the package label. They protect themselves while feeding by rolling leaves into tubes and binding them with strands of silk. Shaded area represents potential planting range. They sometimes cluster in large masses on tender new leaves and buds of spirea. SYMPTOMS: Silver or bronze colored streaks on leaves, which eventually turn brown, â¦ Fireblight is named for the black coloring that develops on host trees, giving them a scorcheâ¦ Gold Threadâ¢ Spirea Spiraea thunbergii 'Ogon' This spring bloomer has white flowers over chartreuse, willow-like leaves. 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. 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. Heavily infected leaves turn yellow or brown and fall prematurely. It's a carefree, vigorous grower, and matures at 3 to 4 feet tall and â¦ They develop yellowed or bronzed foliage, then they decline slowly and die. 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. Inspecting their undersides reveals yellowish, waxy spore masses. A bacterial disease and poor water management round out the primary problems of spirea, but a little environmental housekeeping may keep your plants healthy. 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 are deciduous shrubs that grow 2 to 6 feet tall depending upon species and variety. It holds its color throughout the summer and turns a coral-orange in the fall. Potential diseases include: fire blight, leaf spot, powdery mildew, and root rot. After each cut, dip your pruning tool into a 10 percent chlorine bleach solution to sterilize it. Adult moths are brown or gray, 1/4 to 1/2 inch long. Applying a 2- to 3-inch layer of mulch around shrubs slows evaporation and helps to keep roots moist. Japanese spirea (Spiraea japonica) grows up to 5 feet tall with flat clusters of pink to red flowers that bloom in summer. Infested new growth in spring is stunted and severe infestations can kill a young shrub. Noted for its dazzling foliage, Spiraea betulifolia 'Tor' (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. If you have a deer problem at your house, this plant might be a perfect choice for your garden. As powdery mildew continues, fungal growth encompasses more and more plant tissue. Problems. This removes the dead blossoms and also may trigger a second blooming and new leaf growth. long (5 cm). The removal of affected leaves and stems, and the application of a chemical fungicide or a biofungicide may halt the spread of some. Do You Need to Pinch Back Calliope Geraniums? Noteworthy Characteristics. The National Gardening Association touts spirea as one of the easiest flowering shrubs you can grow. When leaf spot does occur, it is most often caused by Entomosporium maculatum, which is common in members of the rose family. Most were just ... Q. Ants, attracted by the aphids' honeydew secretions, wander over the plants and protect the aphids from natural predators. These rugged shrubs are typically free of major pests, although a namesake aphid is occasionally bothersome. Large, showy clusters of tiny white flowers appear in mid-summer. Leaf spot diseases may affect spirea but are also not especially damaging to the health and appearance of the tree. The three primary species of this deciduous shrub reflect different growth forms and bloom times. Spirea Aphid. Spider mites, often living in colonies of hundreds on the undersides of leaves, can cause significant damage to 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. False-spirea is a dense, colony-forming, suckering shrub best used for naturalizing, erosion control. Click here for more information on Controlling ScaleLeaves and Twigs Die Back Due to Fire BlightThis bacterial disease is spread by insects and rain. The National Gardening Association touts spirea as one of the easiest flowering shrubs you can grow. Spiraea cantoniensis -- Reeveâs Spiraea Page 2 October 1999 Figure 2. Problems. They will ingest the bacterium and later die. Sometimes, itâs a wonder that anybody bothers growing anything, with all the diseases, problems and pests that plants seem to attract out of nowhere. This primary insect pest feeds on cell sap by piercing plant tissue and siphoning the liquid. If the aphids are all over the shrub, spray them directly with an insecticide product featuring insecticidal soap according to label instructions. They suck sap from plant foliage protected by rounded waxy shells which make telltale bumps on stems and leaf undersides. 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. Jets of water from your garden hose dislodge aphids, but in severe infestations, you can use insecticidal soaps to control these pests. 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. 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. Their feeding retards plant growth, and causes the leaves to curl and turn yellow. 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. Click here for more information about Controlling CaterpillarsShrub Stunted, Leaves Discolored by Root Knot NematodesSpireas infested with Southern root knot nematodes look sickly, wilted, or stunted. THRIPS. Are âMagic Carpetâ Spirea Deer Proof? It has grown to over 6 feet tall and spread to â¦ ), you can have flowers in spring, summer and fall. Hi Barbara-The red spots on your spirea leaves are most likely a fungal disease. Larvae are dark to light green or cream to yellow caterpillars, 3/8 to 1 3/4 inch long. Reportedly has good resistance to powdery mildew. Cercospora Leaf Spot (also known as Cercospora hydrangea), is typically brown or purple colored spots at the base of the plant. As part of the Rosaceae family of plants, the various Spiraea species can be somewhat susceptible to some of the same problems that affect other members of the rose family, such as leaf spots, fire blight, powdery mildew, root rot, aphids, leafrollers and scale insects. If you notice any of these symptoms, look for the scale insects themselves. It is one of the most destructive diseases of some spireas, blighting young twigs and limbs. Shake out all fallen and diseased leaves from the center of the shrub and destroy them. Eliminate nearby ant nests if possible. Sorbaria sorbifolia is commonly called false spirea Also known as Ural false spirea and ash leaf spirea. Mulching helps prevent splash-borne infection in outdoor plantings. Insects, Diseases, and Other Plant Problems: This plant may be damaged by deer. Although spirea tolerates dry sites, it grows best in consistently moist soil that drains well. Young feathery leaves, colored in lime green with the red, pink, orange and golden tips appear when winter ends. And ones that add pretty flowers, luminous foliage, and multi-season color give even greater value â like spirea. The first sign is a slight stippling of dots on the leaves, after which the leaves turn yellow and drop off. On heavily infected plants, the tiny, round leaf spots merge into large dead patches. 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. The shrubs benefit from being mulched, particularly in hot weather. 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. Optimum conditions for growth. Fire blight (Erwinia amylovora) bacteria oozing from cankers on previously infected spirea branches migrate... Fire Blight Control. The bumps may be white, yellow, or brown to black, and are about 1/10 to 2/5 inch in diameter. 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. Deer donât give spireas a single look, which is always worth an extra star in my book and Iâve not found them to be affected much by other bugs or common diseases. May be difficult to find in local nurseries. Damage to spirea plants causes injuries that look like fire has blackened the leaves, flowers and stems. Since control is time consuming, most homeowners choose to live with it. However, root rot from oversaturation may be irreversible. My Spirea Bush Is Dying Verticillium Wilt. If your plant succumbs to this disease, immediately prune all affected stems at least 10 inches below the infection and destroy them. âGoldflameâ is a gold leaf spirea with light pink blooms. As aphids move across leaves to feed, they excrete a sticky substance called honeydew on which sooty mold grows. Dying branches, which appear scorched, are conspicuous during the summer and ruin the shrubs' ornamental value. Prune out infected branches, cutting at healthy tissue well below blighted areas. Some species of scale excrete honeydew, which attracts ants and encourages the growth of sooty mold on the leaves. Spirea is also known by the scientific name Spiraea japonica and is a member of the Rosaceae family. See this plant in the following landscape: Cut down and trash (do not compost) seriously infected shrubs together with the soil ball. Spray more heavily infested shrubs with light horticultural oil according to the directions of the label to smother the insects and any eggs. After studying botany and microbiology at Clemson University, Blackstone was hired as a University of Georgia Master Gardener Coordinator. While this disease is not fatal, it does mar the appearance of the shrub. Webbing may appear all over the plant and damage worsens with water stress. Spirea generally aren't bothered by any serious pest or disease problems. Fire blight is a bacterial disease caused by the pathogen Erwinia amylovora. Check stem tips and leaf undersides for small groups of aphids. 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. This disease affects the foliage, stems and flowers of infected trees, causing a coating of fungi to develop on leaf surfaces. Small, circular, red spots on both the upper and lower surfaces of new growth would be an indication of this fungal disease. 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. Spirea leaves with both surfaces exhibiting light-yellow lesions that darken over time suffer from Cylindrosporium filipendula leaf spot. It may discolor spirea foliage and even kill lower branches that dogs visit repeatedly. She is also a former mortgage acquisition specialist for Freddie Mac in Atlanta, GA. How to Get Rid of Bugs & Fungus on Camellias. Problems of Spirea Leaves Curled and Distorted by Aphids Aphids, also called "plant lice," are soft-bodied, pear-shaped sucking insects about the size of the head of a pin. Spirea shrubs are easy to grow and grow in almost all climatic zones. Do not over fertilize, because excess nitrogen makes the shrub more blight-prone. Simply scrape small patches of bumps off spirea leaves or stems with your fingernail or a cotton swab dipped in rubbing alcohol. 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.
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