Powdery mildew is a common disease of a variety of landscape trees, flowers and shrubs. Noted for its dazzling foliage, Spiraea betulifolia 'Tor' (Birchleaf Spirea) is a compact, rounded, deciduous shrub with multi-season interest. Simply scrape small patches of bumps off spirea leaves or stems with your fingernail or a cotton swab dipped in rubbing alcohol. This is my false spirea the day I planted it less than two years ago. Since control is time consuming, most homeowners choose to live with it. Adult moths are brown or gray, 1/4 to 1/2 inch long. 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. They suck sap from plant foliage protected by rounded waxy shells which make telltale bumps on stems and leaf undersides. All these symptoms result from nematodes, whitish, translucent, roundworms about 1/50 to 1/10 inch long, which attack their roots. These rugged shrubs are typically free of major pests, although a namesake aphid is occasionally bothersome. 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. If the bush is not pruned to... Plant Hardiness. 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. No serious insect or disease problems. You must repeat this treatment every five days when temperatures are above 65 degrees Fahrenheit or the humidity reaches 65 percent, to minimize infections. âSnowmoundâ is a 7-foot tall version that has less disease. Cut down and trash (do not compost) seriously infected shrubs together with the soil ball. ), you can have flowers in spring, summer and fall. âGoldflameâ is a gold leaf spirea with light pink blooms. 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. It is toxic to nematodes. Spider Mites. You should actually prune your spirea more than once a year, at least twice. 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 Pour diluted liquid fish emulsion onto the soil around affected roots. However, root rot from oversaturation may be irreversible. âAnthony Watererâ is a popular 4 to 5 feet tall and wide spirea with pink-rose colored blooms and reddish fall foliage color. As aphids move across leaves to feed, they excrete a sticky substance called honeydew on which sooty mold grows. It has grown to over 6 feet tall and spread to â¦ 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. The oblique-banded leafroller sometimes attacks spirea 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. 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. This disease affects the foliage, stems and flowers of infected trees, causing a coating of fungi to develop on leaf surfaces. Aphid feeding damage causes curled, distorted leaves. After studying botany and microbiology at Clemson University, Blackstone was hired as a University of Georgia Master Gardener Coordinator. are deciduous shrubs that grow 2 to 6 feet tall depending upon species and variety. They will ingest the bacterium and later die. False-spirea is a dense, colony-forming, suckering shrub best used for naturalizing, erosion control. Shaded area represents potential planting range. Large, showy clusters of tiny white flowers appear in mid-summer. 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. If you notice any of these symptoms, look for the scale insects themselves. If there are not too many leafrollers, handpick the larvae in their leafy tubes and crush them. Give it a good trim after it flowers in the spring by cutting back the tips of the stems to the top leaf bud. After each cut, dip your pruning tool into a 10 percent chlorine bleach solution to sterilize it. 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. Too much or too little water can stress plants. This attractive shrub has a late winter and spring interest. This removes the dead blossoms and also may trigger a second blooming and new leaf growth. Applying a 2- to 3-inch layer of mulch around shrubs slows evaporation and helps to keep roots moist. 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.
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