those considered historical (not seen in 20 years). The best thing to do is plant a variety that is resistant Above-ground parts of the shrub generally appear stunted and yellowed and leaves may drop. Viburnum beetles are visible on infested plants in both of their growth stages. This outstanding shrub is available in smaller sizes, and a good choice for a limited space would be the Blue Muffin Viburnum. Within a few hours, the crawlers will settle in a suitable spot to begin feeding and excreting a waxy covering for protection. RI. The spots enlarge to form angular patches between the leaf veins. Show Spray when thrips are present and again in 7 to 10 days. Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. Insecticides and Fungicides for Viburnum Insect Pest and Disease Control. Mulching shrubs helps to avoid mechanical injury to trunk and limbs by weed trimmers and lawn mowers. opulus) and designated Viburnum opulus var. Rake up and destroy infected fallen leaves. Infections of the foliage in the spring can result from splashing spores produced by the diseased foliage remaining on the ground from the previous year. Viburnum opulus 'Nanum' is: Deciduous. The Garden Website.com provides numerous methods of control and includes resistant varieties. I want to. V. opulus a sighting. Non-native: introduced It is not so useful and well-doing a shrub as V. opulus in Britain, starting earlier into growth, and being subject to injury by spring frosts. Urinary tract infections and bladder infections are often associated with frequent and painful urination. FACW). Emerging soft lime green, the eye-catching snowball blossoms change to pure white and often blush pink before they fade. the state. Viburnum leaf beetle has been known in some eastern states since the early 1990’s. Monitor the plants for disease problems, practice good sanitation as stated with fungal leaf spot control, and treat any other landscape plants in the area that have algal leaf spot. COVID-19 Extension Updates and Resources ... More Information », Factsheet | HGIC 2057 | Updated: Jan 13, 2020 | Print | Download (PDF). Clemson University Cooperative Extension Service offers its programs to people of all ages, regardless of race, color, gender, religion, national origin, disability, political beliefs, sexual orientation, gender identity, marital or family status and is an equal opportunity employer. L. N│E. Also covers Armored scales, such as the oystershell scale (Lepidosaphes ulmi), can infest viburnum and cause branch dieback. Insecticides labeled for homeowner use against scale crawlers include acephate, malathion, bifenthrin, cyhalothrin, and cyfluthrin (see Table 1 for specific products). opulus is 
non-native and known from Fruit is similar to that of Viburnum opulus but is used for preserves and jellies. americanum . These steps will improve air circulation around the plants and aid in the drying of foliage. opulus and V. o. var. Viburnum opulus Roseum or the Snowball Tree is one of the deciduous viburnum darlings – prized for its stunning fluffy white flowers. Bayer BioAdvanced 3-in-1 Insect, Disease & Mite Control Conc. is shown on the map. Leaves look much like those of Viburnum opulus; they emerge reddish tinged, mature to dark green, turn yellow to red-purple in fall. If your Viburnum has angular shaped, water soaked, diseased areas on its leaves, the plant may have bacterial leaf spot, also known as bacterial blight. The grubs cause more significant damage than do the adults.  
9b. 1a.  Petiole glands stalked, taller than wide, truncate to convex at the apex 
 Insecticidal soaps will help control thrips, but thorough coverage is necessary. The occurrence and spread of this disease is favored by a combination of warm days, cool nights, and humid conditions, but is inhibited by rain. All Characteristics, there are two scales on the winter bud, and their edges meet, there is one scale on the winter bud, and it covers the scale like a cap, the winter buds are ellipsoid (elliptical in three dimensions), there are two or more ways to evenly divide the flower (the flower is radially symmetrical), there is only one way to evenly divide the flower (the flower is bilaterally symmetrical), the base of the leaf blade is cuneate (wedge-shaped, tapers to the base with relatively straight, converging edges), or narrow, the base of the leaf blade is truncate (ends abruptly in a more or less straight line as though cut off), the leaf blade is orbicular (roughly circular, as wide as long), the leaf blade is ovate (widest below the middle and broadly tapering at both ends), the leaf blade is triangular, with the stalk or attachment point on one of the sides, there are no lenticels on the twigs, or they are very hard to see. Prevention & Control: Since high relative humidity is an important factor favoring disease development, certain cultural practices can help prevent the disease or decrease its severity. Viburnum opulus image, please click it to see who you will need to contact. Prized by florists, Viburnum opulus 'Roseum' (European Cranberrybush) is a large, bushy deciduous shrub of rounded habit, adorned with a profusion of large rounded clusters, 3 in. Found in the mountainous regions of Europe, South America, and Central Asian countries like Kazakhstan, cramp bark (also known as the guilder-rose or Viburnum Opuius in the scientific community). opulus was reported from (Marsh.) Oystershell scale (Lepidosaphes ulmi).Whitney Crabshawm Colorado State University, Bugwood.org. Insecticides labeled for adult weevil control include bifenthrin, acephate, permethrin, and cyfluthrin. americanum NC State University and N.C. A&T State University work in tandem, along with federal, state and local governments, to form a strategic partnership called N.C. Don’t panic. It is a caterpillar food plant, has nectar/pollen rich flowers, provides shelter and habitat, has seeds for birds and makes a good wildlife hedge. Viburnum is an excellent plant, and it will assure you a beautiful landscape. The Go Botany project is supported Along forest edges and hedgerows, these shrubs provide important cover to small mammals and birds. Downy mildew on viburnum is caused by the fungus, Plasmopara viburni. VLB is native to Europe and was detected in Canada in 1947. in part by the National Science Foundation. (Wetland indicator code: V. trilobum Marsh. For details, please check with your state. Viburnum opulus is a deciduous shrub growing to 4–5 m (13–16 ft) tall. Typically, the symptoms of this root rot occur over the whole plant. (drench), Spectracide Triazicide Insect Killer for Lawns & Landscapes Concentrate (also in RTS, Bonide Mancozeb Flowable with Zinc Concentrate, Spectracide Malathion Insect Spray Concentrate, Spectracide Immunox Multi-Purpose Fungicide Concentrate (also in RTS, Southern Ag Triple Action Neem Oil Concentrate, Bonide Eight Insect Control Vegetable, Fruit & Flower Concentrate, Southern Ag Natural Pyrethrin Concentrate, Southern Ag Conserve Naturalyte Insect Control Concentrate. Affected plant tissues develop a powdery white to light gray growth of fungal mycelia. Thrips feed on expanding leaves, which creates purplish red spots on the undersurfaces and causes foliage to severely curl or roll, then drop prematurely. They feed by piercing plant tissue and sucking plant sap. To avoid killing these beneficial insects which reduce thrips populations, insecticides should be avoided as much as possible. This disease is caused by Pseudomonas syringae pv. The disease typically appears in the summer and reaches its peak in late summer. CT, MA, ME, Viburnum opulus 'Nanum' - Dwarf European Cranberrybush - dwarf form slowly growing to 3' tall by 3' wide, densely foliaged with essentially no flowers or fruits; new leaves emerge red-bronzed and rapidly change to dark green, with incised margins that are more deeply sinuate, often used as a facer shrub or dwarf shrub where foliage is the primary consideration; can be easily controlled by rejuvenation … across (7 cm), packed with sterile flowers in late spring. VT. Subspecies trilobum Thrips are typically found on leaves and between flower petals. Found this plant? Viburnum is a plant that has over 150 different species. Prevention & Control: Spider mites can be removed with strong sprays of water, if applied on a regular basis. This fungus can rot the roots of many different kinds of plants. Foliage The leaves have three pointed lobes and are coarsely toothed; 2-4 in. Fungicides labeled to control downy mildew include mancozeb, chlorothalonil, or copper fungicides (see Table 1 for specific products). Fungal leaf spots typically occur during warm, moist summer months, and initially will occur on older foliage. Cramp bark can relieve the pain and decrease the urgent frequency as well. Identified in winter by: green, hairless buds which have a pair of scales. Clausen, 1b.  Petiole glands sessile, wider than tall, concave at the apex If higher toxicity insecticides are deemed necessary, sprays containing acephate, bifenthrin, cyfluthrin, lambda cyhalothrin, malathion, neem oil, permethrin, or pyrethrin will control aphids. Blooms midspring, bearing lace-cap flowers to 4 inches across. Avoid replanting the same species as the one removed. State documented: documented This information is supplied with the understanding that no discrimination is intended and no endorsement of brand names or registered trademarks by the Clemson University Cooperative Extension Service is implied, nor is any discrimination intended by the exclusion of products or manufacturers not named. NH, Join our mailing list to receive the latest updates from HGIC. If sufficient bark is removed, the leading edge of the fungal growth will be found, and this white growth has a characteristic fan-shape. These sporangia are spread to adjacent foliage by wind and splashing rain. Viburnum opulus and wildlife. The southern red mite (Oligonychus illicis) is a dark reddish or brown-colored mite that is a common pest in the eastern US. If the infestation is severe enough, they may kill the shrub. It is native to Europe, northern Africa and northern Asia. Along with the foliar applications, also treat the surface of the soil or mulch immediately beneath the plants (as a spray, not a drench) because this is where the adults will hide during the day. Based on leaf ID only, it would be mistaken for V Regardless of the height, the plant will have fragrant flowers that will be noticeable in your garden. It has lovely lime green leaves, and is a hardy shrub. Viburnum Viburnum. These aphids are gray to dark green and feed in clusters at the tips of the branches, causing leaf curl. The cause of the unhealthiness or death may be difficult to determine, as similar symptoms may be caused by environmental factors, such as weather stress or a general lack of plant care. Root and crown feeding by the grubs may kill the shrub. Healthy plants are much more resistant to infection by Botryosphaeria spp., as they will wall off the fungus and prevent its spread through the branch. Prevention & Control: Many foliar problems can be prevented by keeping leaves as dry as possible. Highbush Cranberrys (Viburnum opulus var. Avoid using more toxic insecticides unless the plant is seriously damaged from the scale infestation. Powdery mildew is worse on plants in the shade. ), appears as black, sunken lesions. Prized by florists, Viburnum opulus 'Roseum' (European Cranberrybush) is a large, bushy deciduous shrub of rounded habit, adorned with a profusion of large rounded clusters, 3 in. It is hardy down to −10 °C (14 °F). ; Armillaria root rot is also known as shoestring root rot, mushroom root rot, and oak root rot. Prune back adjacent shrubs or overhanging tree limbs. Your help is appreciated. Native Plant Trust or respective copyright holders. If Armillaria is responsible for the plants decline, white felt-like fungal growth can be seen under the bark if the bark is carefully peeled back. Tattered viburnum leaves that resemble lace more than foliage, are a symptom of viburnum leaf beetles (Pyrrhalta viburni). Tattered viburnum leaves that resemble lace more than foliage, are symptoms of viburnum leaf beetles (Pyrrhalta viburni). Horticultural oil may be sprayed when temperatures are between 40 and 85 °F. Azaleas, camellias, and hollies are the primary hosts for this mite, but it has been found on many other species including viburnums. A similar species that is native to North America is Viburnum trilobum [American Cranberrybush Viburnum], but more recently this plant is classified as a variety (varietas, var.) Powdery mildew of viburnum primarily affects young leaves and shoots. NH, Cooperative Extension, which staffs local offices in all 100 counties and with the Eastern Band of Cherokee Indians. Initially, this disease appears as light green spots on the upper leaf surfaces. Its white flowers are produced in large round clusters, hence the snowball name, and the scarlet fruit somewhat resembles a cranberry. Flower thrips (Frankliniella spp. americanum. They can cause twisting and curling of the young growth. It can also be used for hedging. The disease anthracnose (caused by Colletotrichum spp. americanum. highbush-cranberry.  evidence (herbarium specimen, photograph). CT, MA, ME, Viburnum opulus 'Nanum' - Dwarf European Cranberrybush - dwarf form slowly growing to 3' tall by 3' wide, densely foliaged with essentially no flowers or fruits; new leaves emerge red-bronzed and rapidly change to dark green, with Both, however, are low-maintenance and trouble-free plants. Viburnum opulus, commonly called European cranberry bush, is a highbush cranberry that is native to Europe, Asia and N. Africa. Follow all directions, precautions and restrictions that are listed. Viburnum opulus L. ssp. Monitor the crawler emergence in the spring with sticky cards, double-faced tape wrapped around a branch, or by putting an infested shoot or leaf into a baggie and watching for crawler movement. If it becomes essential to spray an insecticide, the following are available in homeowner size packaging: acephate, bifenthrin, cyfluthrin, lambda cyhalothrin, permethrin, or spinosad. Repeat this application after 10 days to better control the crawlers, adults, and eggs by smothering them. Dispose of all prunings, as this plant material is a potential source of disease for viburnums, as well as other woody shrubs. Fruit is similar to that of Viburnum opulus but is used for preserves and jellies. Viburnum opulus has maple-like leaves and beautiful white lace-cap flowers in the Spring, followed by clusters of translucent red berries in early Autumn. Soaps and oils must be sprayed onto the aphids to be effective. A variety of leaf spots are caused by the fungi Cercospora spp., Phoma spp., and Phyllosticta spp. americanum Ait. If this document didn’t answer your questions, please contact HGIC at hgic@clemson.edu or 1-888-656-9988. It's current Latin name, Viburnum opulus L. var. If the leaves of your viburnums look like they’ve gone through a leaf shreader, you can be sure they’re under attack from the viburnum leaf beetle ( Pyrrhalta viburni ), This small, elongated beetle is native to Europe and Asia. Viburnum opulus (Guelder rose) will reach a height of 6m and a spread of 4m after 10-20 years. To determine if additional spray treatments are needed, shake or tap branches over a piece of white paper. If fungicides are necessary, sprays should adequately cover both the upper and lower leaf surfaces. The name of the plant comes from several cultures, but it is thought to have been first recognized by the Dutch, who claim that the tree was initially found in the forests of Scandinavia. Viburnum leaf beatle larvae. of Viburnum opulus , the European Cranberry Viburnum (syn. It can reach up to 4m high and can spread from 2–5m. Both adults and nymphs (immature insect stage that resemble the adult, but are smaller) feed by scraping surface cells to suck plant sap. This pathogen will overwinter in leaf spots. Viburnum opulus is known for attracting bees, beneficial insects, birds, butterflies / moths and other pollinators. Thrips are slender, dark-colored insects, with fringed wings. of Viburnum opulus and designated Viburnum opulus var. state. Algal leaf spot, caused by Cephaleuros virescens, may occur especially during cool, moist conditions. Grass and weeds in the area should be kept mowed or removed when possible. Cramp Bark (Viburnum opulus): The Awful Tasting Tea with Great Benefits What is Cramp Bark? opulus セイヨウカンボク 中国、ロシア、カザフスタン、キルギスタン、コーカサス、ヨーロッパ原産。英名はcrampbark , European cranberry-bush , guelder-rose , snowballbush Viburnum opulus is a deciduous shrub growing to 4–5 m (13–16 ft) tall. In general, most viburnums are relatively pest-free. What causes viburnum leaf curl? Viburnum molle Common Name: Kentucky Viburnum A large multi-stemmed, rounded shrub growing 8-12' tall and wide, native to the central and southern states of North America. Viburnum opulus has maple-like leaves and beautiful white lace-cap flowers in the Spring, followed by clusters of translucent red berries in early Autumn. A few possible sightings of this pest were reported in 2013 an 2014. to exist in the state, but not documented to a county within Once foliar damage is observed, insecticidal sprays should be made at 2- to 3-week intervals, where three sprays are usually sufficient. Try growing it as part of a mixed wildlife hedge. If chemical control is needed, most fungal leaf spots and anthracnose can be controlled with sprays of fungicides containing chlorothalonil, thiophanate-methyl, myclobutanil, or mancozeb. Any thrips present will move around on the paper. VT. Swamps, wetland margins, shorelines; also introduced to field edges, roadsides, and abandoned lots. Viburnum opulus 'Nanum' (Dwarf guelder rose) will reach a height of 0.6m and a spread of 0.9m after 5-10 years. Use pesticides only according to the directions on the label. To prevent foliar injury, apply horticultural oils for powdery mildew control only if temperatures are below 85 °F. ; No fungicides are recommended for the control of fungal cankers, but pruning wounds may be sprayed for protection with a benzimidazole fungicide, such as thiophanate methyl (see Table 1 for specific products). Viburnum opulus L. var. Only apply horticultural oils or insecticidal soaps if temperatures are below 85 °F. Leaf spot fungal diseases, as well as the fungal disease anthracnose, usually do not do lasting harm to your plants. Viburnum opulus Sterile - PB6.5 (30/40) - Snowball Tree / Shrub - A hardy deciduous shrub with maple like deep green leaves. It is a deciduous shrub with a rounded spreading habit that typically grows to 10-15’ tall. Prune any branches with cankers back to green healthy wood. Leaves look much like those of Viburnum opulus; they emerge reddish tinged, mature to dark green, turn yellow to red-purple in fall. Copyright © 2020 Clemson UniversityClemson Cooperative Extension | 103 Barre Hall Clemson, SC 29634864-986-4310 | Contact UsHGIC@clemson.edu, College of Agriculture, Forestry and Life Sciences, Centipedegrass Yearly Maintenance Program, Bonide Systemic Insect Control Concentrate, Ortho Bug-B-Gon MAX Insect Killer for Lawns & Gardens Concentrate, Hi-Yield Vegetable, Flower, Fruit & Ornamental Fungicide Concentrate, Camelot O Fungicide/Bactericide Concentrate, Bayer BioAdvanced Vegetable & Garden Insect Spray Concentrate, Gordon’s Zylam Liquid Systemic Insecticide, Ferti-lome Horticulture Spray Concentrate, Bayer BioAdvanced Garden 12 month Tree & Shrub Insect Control Conc. NH, The unhealthy foliage may become more sparse over a period of several years. Viburnum opulus var. Soil type Chalky, Clay [Fig. 314] 
 The viburnum leaf beetle (VLB), Pyrrhalta viburni, is an invasive insect that feeds exclusively on and can significantly damage Viburnum species. Downy mildew disease is different from powdery mildew in that the fungal growth is observed on the lower rather than on the upper leaf surface. Suggested uses Coastal, City, Beds and borders, Cottage/Informal, Hedging/Screens, Low Maintenance The adult weevil is a black, wingless weevil about ⅜-inch long. Both the lower and upper leaf surfaces must be sprayed for good control.