Gold Threadâ¢ Spirea Spiraea thunbergii 'Ogon' This spring bloomer has white flowers over chartreuse, willow-like leaves. 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. Are âMagic Carpetâ Spirea Deer Proof? Simply scrape small patches of bumps off spirea leaves or stems with your fingernail or a cotton swab dipped in rubbing alcohol. It is toxic to nematodes. Problems. Birchleaf spirea is a great small, rounded shrub, reaching 3 to 4 feet high. Lovely yellow-hued birch leaf spirea Dense, petite habit (just 3-4â tall and wide!) Q. Spirea Out Of Control - About 4 to 5 years ago, I moved several perennials from my deceased parents yard to mine. They are recognized by their abundant flowering in whites, pinks, or reds. Noteworthy Characteristics. May be difficult to find in local nurseries. 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. âMagic Carpetâ Spirea is deer-resistant, which means the plant is not a normal part of their diet. Spirea Problems Spirea. Fire blight causes the branches affected by the disease to appear scorched. Gold Mound Spirea - I just purchased some gold mound spirea for planting and they looked great a week ago, and now the leaves ... Q. My Spirea Bush Is Dying Verticillium Wilt. 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. Optimum conditions for growth. Leaves Curled and Distorted by AphidsAphids, also called "plant lice," are soft-bodied, pear-shaped sucking insects about the size of the head of a pin. And ones that add pretty flowers, luminous foliage, and multi-season color give even greater value â like spirea. 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. Spirea shrubs are easy to grow and grow in almost all climatic zones. 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. It is rare, however, for these problems to kill a spirea. No serious insect or disease problems. Small, circular, red spots on both the upper and lower surfaces of new growth would be an indication of this fungal disease. After each cut, dip your pruning tool into a 10 percent chlorine bleach solution to sterilize it. University of California Statewide Integrated Pest Management Program: Spirea -- Spirea Spp. Noted for its dazzling foliage, Spiraea betulifolia 'Tor' (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. 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. Webbing may appear all over the plant and damage worsens with water stress. While this disease is not fatal, it does mar the appearance of the shrub. The first sign is a slight stippling of dots on the leaves, after which the leaves turn yellow and drop off. Spider mites, often living in colonies of hundreds on the undersides of leaves, can cause significant damage to spirea. This removes the dead blossoms and also may trigger a second blooming and new leaf growth. Mulching helps prevent splash-borne infection in outdoor plantings. They may taste it or chew a leaf or two, but generally the plant is not their primary source of food. Entomosporium is one of the fungal diseases that infects many plants in the rose family (Rosaceae). 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. The oblique-banded leafroller sometimes attacks spirea leaves. 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. You must repeat this treatment every five days when temperatures are above 65 degrees Fahrenheit or the humidity reaches 65 percent, to minimize infections. Young feathery leaves, colored in lime green with the red, pink, orange and golden tips appear when winter ends. Fireblight is named for the black coloring that develops on host trees, giving them a scorcheâ¦ To think, I once considered spirea to be âvan ordinaire.â Also try screening the plants or spraying foliage with a repellent spray. Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis. The spirea aphid (Aphis citricola) occurs in all areas of the U.S., notes University of Illinois Extension. 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. No known serious insect or disease problems. Most were just ... Q. Prune out infected branches, cutting at healthy tissue well below blighted areas. 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. 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 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. 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. Their feeding retards plant growth, and causes the leaves to curl and turn yellow. Cut down and trash (do not compost) seriously infected shrubs together with the soil ball. This disease is rarely serious unless the spirea is planted near pears, apples or hawthorns which are also susceptible to it. Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. Do Spirea Bushes Scare Off Birds, Squirrels - Just planted a 4-gal. It is one of the most destructive diseases of some spireas, blighting young twigs and limbs. Larvae are dark to light green or cream to yellow caterpillars, 3/8 to 1 3/4 inch long. It grows 3 feet tall and wide. Spray more heavily infested shrubs with light horticultural oil according to the directions of the label to smother the insects and any eggs. The National Gardening Association touts spirea as one of the easiest flowering shrubs you can grow. Also, it doesn't burn in the summer and has great fall color. Adult moths are brown or gray, 1/4 to 1/2 inch long. Fire blight is a bacterial disease caused by the pathogen Erwinia amylovora. Spray shrubs with a streptomycin antibiotic wettable powder product to protect blossoms. Spirea Aphid. This is my false spirea today. Mash isolated clusters between thumb and forefinger or spray light infestations with a vigorous water spray 3 times, every other day or so, in the early morning. 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. Click here for more information on Controlling ScaleLeaves and Twigs Die Back Due to Fire BlightThis bacterial disease is spread by insects and rain. 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. Insects, Diseases, and Other Plant Problems: This plant may be damaged by deer. It's a carefree, vigorous grower, and matures at 3 to 4 feet tall and â¦ 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. Large, showy clusters of tiny white flowers appear in mid-summer. 1a. Follow the instructions on the package label. The large compound leaves open on arching stems, unfolding with a reddish tinge gradually changing to â¦ The shrubs benefit from being mulched, particularly in hot weather. The three primary species of this deciduous shrub reflect different growth forms and bloom times. 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. Infested new growth in spring is stunted and severe infestations can kill a young shrub. 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 Virtually indestructible, Spiraea betulifolia (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. 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. Damage to spirea plants causes injuries that look like fire has blackened the leaves, flowers and stems. This disease affects the foliage, stems and flowers of infected trees, causing a coating of fungi to develop on leaf surfaces. If you notice any of these symptoms, look for the scale insects themselves. Spider Mites. Remove dead or dying shrubs with the soil around their roots and discard them in the trash. Do not over fertilize, because excess nitrogen makes the shrub more blight-prone. If your plant succumbs to this disease, immediately prune all affected stems at least 10 inches below the infection and destroy them. 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. Since control is time consuming, most homeowners choose to live with it. This is my false spirea the day I planted it less than two years ago. Shake out all fallen and diseased leaves from the center of the shrub and destroy them. Some species of scale excrete honeydew, which attracts ants and encourages the growth of sooty mold on the leaves. Spirea Diseases Fire Blight. Extensive summer leaf drop may follow. Sometimes, itâs a wonder that anybody bothers growing anything, with all the diseases, problems and pests that plants seem to attract out of nowhere. Spray vulnerable foliage with an anti-transpirant spray to provide some ground-level protection. They sometimes cluster in large masses on tender new leaves and buds of spirea. All these symptoms result from nematodes, whitish, translucent, roundworms about 1/50 to 1/10 inch long, which attack their roots. Sorbaria sorbifolia is commonly called false spirea Also known as Ural false spirea and ash leaf spirea. If you dig gently down to the root zone, you may discover your spirea’s need for better drainage, rather than more water. It has grown to over 6 feet tall and spread to â¦ ), you can have flowers in spring, summer and fall. Fire Blight. The National Gardening Association touts spirea as one of the easiest flowering shrubs you can grow. Pick off and discard infected 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. Like other members of the rose family, spireas are susceptible to various pests and diseases, but most are not serious. If the aphids are all over the shrub, spray them directly with an insecticide product featuring insecticidal soap according to label instructions. They do, however, want to be in at least part sun and, like most plants, youâll get the best flowering in more sun. âAnthony Watererâ is a popular 4 to 5 feet tall and wide spirea with pink-rose colored blooms and reddish fall foliage color. Although spirea tolerates dry sites, it grows best in consistently moist soil that drains well. âSnowmoundâ is a 7-foot tall version that has less disease. 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.