You must repeat this treatment every five days when temperatures are above 65 degrees Fahrenheit or the humidity reaches 65 percent, to minimize infections. 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. 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. It holds its color throughout the summer and turns a coral-orange in the fall. ‘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. A bacterial disease and poor water management round out the primary problems of spirea, but a little environmental housekeeping may keep your plants healthy. However, root rot from oversaturation may be irreversible. 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. 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. Extensive summer leaf drop may follow. Applying a 2- to 3-inch layer of mulch around shrubs slows evaporation and helps to keep roots moist. 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. These rugged shrubs are typically free of major pests, although a namesake aphid is occasionally bothersome. Powdery mildew is a common disease of a variety of landscape trees, flowers and shrubs. Prune out infected branches, cutting at healthy tissue well below blighted areas. Hi Barbara-The red spots on your spirea leaves are most likely a fungal disease. Gold Thread™ Spirea Spiraea thunbergii 'Ogon' This spring bloomer has white flowers over chartreuse, willow-like leaves. If you dig gently down to the root zone, you may discover your spirea’s need for better drainage, rather than more water. Large, showy clusters of tiny white flowers appear in mid-summer. It has grown to over 6 feet tall and spread to … Follow the instructions on the package label. Noteworthy Characteristics. This is my false spirea today. ‘Anthony Waterer’ is a popular 4 to 5 feet tall and wide spirea with pink-rose colored blooms and reddish fall foliage color. Shake out all fallen and diseased leaves from the center of the shrub and destroy them. 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. Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. Spider mites, often living in colonies of hundreds on the undersides of leaves, can cause significant damage to spirea. Entomosporium is one of the fungal diseases that infects many plants in the rose family (Rosaceae). Because Bt is rapidly inactivated by sunlight and rain, you may have to repeat the spray. are deciduous shrubs that grow 2 to 6 feet tall depending upon species and variety. 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. Infested roots are poorly developed, show knots or galls, and may be partially decayed. Young feathery leaves, colored in lime green with the red, pink, orange and golden tips appear when winter ends. 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. Also, it doesn't burn in the summer and has great fall color. Chemical management is generally ineffective once this disease takes hold. Dying branches, which appear scorched, are conspicuous during the summer and ruin the shrubs' ornamental value. Spiraea spp. This removes the dead blossoms and also may trigger a second blooming and new leaf growth. Although spirea tolerates dry sites, it grows best in consistently moist soil that drains well. 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. Sometimes, it’s a wonder that anybody bothers growing anything, with all the diseases, problems and pests that plants seem to attract out of nowhere. Fire Blight. 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. Sunny yellow foliage holds its color well, and the full, compact habit is very attractive. If there are not too many leafrollers, handpick the larvae in their leafy tubes and crush them. The spirea aphid (Aphis citricola) occurs in all areas of the U.S., notes University of Illinois Extension. Some species of scale excrete honeydew, which attracts ants and encourages the growth of sooty mold on the leaves. Do not over fertilize, because excess nitrogen makes the shrub more blight-prone. Their feeding retards plant growth, and causes the leaves to curl and turn yellow. Japanese spirea (Spiraea japonica) grows up to 5 feet tall with flat clusters of pink to red flowers that bloom in summer. long (5 cm). Aphid feeding damage causes curled, distorted leaves. Remove dead or dying shrubs with the soil around their roots and discard them in the trash. They sometimes cluster in large masses on tender new leaves and buds of spirea. Pick off and discard infected leaves.
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