Avoid fertilizer, especially ones high in nitrogen. Powdery mildew does not significantly affect the health of the tree or shrub and does not require management. What is that white powder on your ninebark? - Pahl's Market An upright, spreading, dense shrub with arching branches reaching 6 to 10 feet tall and wide.Cultivars vary in size and leaf color. Attempting to grow plants outside of their suggested zones may result in a higher incidence of disease since the plants may experience less than ideal culture. Features. This hardy plant has very few issues, however, it can fall susceptible to leaf curling and wilting with improper care. White to gray, powdery spots, blotches or felt-like mats form on leaves, stems and buds of infected plants. Fortunately a healthy plant can tolerate the damage. Summer Wine is an easy way to introduce wine-colored foliage into the home garden. Spray until the neem oil drips from all Diabolo's surfaces, including the backs of the leaves. It is remarkably tolerant of many growing conditions, including drought. Central and eastern North America. May 6, 2023
Top Perennial Plants for a Butterfly Garden A hybrid cross between Diabolo and Darts Gold, this variety is grown for its vibrant foliage and exceptional hardiness. 2018-2023 American Society for Horticultural Science, Copy this link, or click below to email it to a friend. Avoid excessive pruning of infected plants during the growing season. These spores start new infections on succulent, new growth. 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. Vanessa Richins Myers has a BS in horticulture and over 10 years of training and experience as a professional horticulturist and gardener. 1, Efficacy of sanitizers, biorational products, and fungicides in management of powdery mildew on ninebarkExpt. Group 3 + 11 fungicide. 12-hr reentry. Pink buds open to pale pink flowers. Combine with complementary purple-foliaged plants for a striking contrast. Pinus albicaulis, known by the common names whitebark pine, white bark pine, white pine, pitch pine, scrub pine, and creeping pine, is a conifer tree native to the mountains of the western United States and Canada, specifically subalpine areas of the Sierra Nevada, Cascade Range, Pacific Coast Ranges, and Rocky Mountains.It shares the common name "creeping pine" with several other plants. The fungal spores overwinter in plant debris and begin producing new spores in the spring. Once established, ninebark is a very good drought-tolerant shrub for dry areas. Powdery mildew is also suspected to occur on Pacific ninebark (P. capitatus). (2010) reported that cucurbit powdery mildew (Podosphaera xanthii) had developed resistance to seven different single site fungicides (benzimidazole, DMI, morpholine, hydroxypyrimidine, phosphorothiolate, QoI, and pyridine carboxamides). Help trees thrive in the Chicago region and around the world. To be safe, contact a veterinarian, physician or poison control immediately if you think your pet or child might have ingested any part of the plant. Ninebark Shrubs Questions & Answers | Questions 1 - 7 With proper upkeep, established ninebark shrubs are free of most problems. 547 59 67, Veloukas, T. & Karaoglanidis, G.S. One variety thrives in the Rocky Mountain region and west to Oregon and Washington. If you decide to treat, try one of the eco-friendly fungicides like Neem or the Cornell baking soda mix. Grow as a foundation planting, hedging, or stand-alone accent in a container. Repeat weekly until the humid weather and favorable temperatures subside. Powdery mildew on viburnum Identifying Powdery Mildew: White to gray powdery spots, blotches or felt-like mats form on leaves, green stems and buds. Online publication. Copyright 2023. Symptoms White superficial powdery colonies on leaves, stems, inflorescences and infructescences. Similar to hydrangeas, ninebark blooms on old wood, so make sure to prune only after flowering. Powdery Mildew . Loosen soil in the planting area and amend with compost. Older stems are brown and exfoliate in papery strips. The Arboretum has the expertise and advice to help you beautify your home landscape, improve your community, and advocate for trees. Pruning . Oregon State University Extension publication, Corvallis, OR, Rur, M., Rmert, B., Hkeberg, M., Vetukuri, R.R., Grenville-Briggs, L. & Liljeroth, E. 2018 Screening of alternative products for integrated pest management of cucurbit powdery mildew in Sweden Eur. The larger stature makes this a good choice as hedging, screening along a property line, at the back of a mixed border, or as a focal point in the landscape. Summer Wine Buy now from Proven Winners This fast-growing shrub can reach maturity in just one single growing season, especially when started from a 1-gallon nursery pot. As the disease progresses it may result in the dieback of branches, yellowed or curled leaves, leaf death and distorted flowers. <, Use of bicarbonates to inhibit in vitro colony growth of, Pacific northwest plant disease management handbook. Physocarpus opulifolius 'Center Glow' - Plant Finder This fungus is favored by conditions that produce high humidity but dry leaves. Applications of fungicides may need to be re-applied every one to two weeks to provide future protection. Powdery mildew needs humid conditions to start new infections. If white fungus is the problem, act immediately to fix the situation. With different sizes and forms of ninebark to choose from, here are some tips to consider: Choose varieties that will fit the scale of your property. Final fall i seen a pair branches that had some kind of white fungus or one thing on them. Good mildew resistance. Use size at maturity as a spacing guide when planting. Leaves on our 9 Bark bushes in the front of the house have gotten white with fungus or powdery stuff first time this year. J. Mention of trade names of commercial products in the publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by Tennessee State University. Growing ninebark in a hot and humid environment makes it susceptible to fungal diseases, like powdery mildew. 2012 Evaluation of whole effluent toxicity data characteristics and use of welchs t-test in the test of significant toxicity analysis Environ. Use as hedging to break the landscape into individual garden rooms. Earn Dollar Rewards with Every Purchase, Learn About Upcoming Events and Sales, Member-Only Discounts . Ninebark will grow in both dry and wet locations. Note Do not use Insignia or Pageant as injury may occur. Soc. Deciding when Diabolo looks less than its best is much easier: It's when the Podosphaera aphanis var. , Giotis, C., Markellou, E., Theodoropoulou, A., Kostoulas, G., Wilcockson, S. & Leifert, C. 2012 The effects of different biological control agents (BCAs) and plant defence elicitors on cucumber powdery mildew (Podosphaera xanthii) Org. It might help to prune out one-third of the biggest, oldest shoots right to the ground each year after your ninebarks bloom. This coarse-textured shrub is a member of therose family, which also includes hawthorn and spirea, and features yellow, green, or reddish leaves that form an attractive cascading mound. Chemical control Many ornamental labels will support the use if they are not phytotoxic to the plants. Rake up and get rid of any leaves that have fallen. How to Grow and Care for Ninebark Shrubs - FineGardening Powdery spores are produced in leaf spots throughout the growing season. For example, the biorational products giant knotweed extract and fungicides chlorothalonil + propiconazole can be used in combination or alternate rotation when powdery mildew disease pressure is low to medium; however, the fungicide azoxystrobin + benzovindiflupyr should be reserved for severe or higher powdery mildew disease severity cases. 150 127 138, Tjosvold, S. & Koike, S.T. University of California Cooperative Extension, Department of Plant Pathology, Davis, CA. 2012 Biological activity of the succinate dehydrogenase inhibitor fluopyram against Botrytis cinerea and fungal baseline sensitivity Pest Mgt. 4-hr reentry. Spacing depends on the variety. This species is native to the Chicago Region according to Swink and Wilhelms Plants of the Chicago Region, with updates made according to current research. Photo: Proven Winners. Ninebark looks best when it is left to maintain its natural growth and shape, however, trimming old wood annually allows for proper air circulation. Powdery mildew on trees and shrubs | UMN Extension Powdery mildew affects Diabolo far less than some ninebark cultivars. In Minnesota, powdery mildew increases in the spring and fall, when cool nighttime temperatures are followed by warm daytime temperatures. University of California Cooperative Extension, Department of Plant Pathology, Davis, CA. Our in-stock notifier is the perfect tool for any plant enthusiast who wants to stay informed and be the first to know when by Chris Kaufenberg | Apr 6, 2023 | Market News. Some gardeners like to keep the bush intact, as the peeling bark and turning leaves add to the garden's winter aesthetic. I have since moved it more into the open. Chem 32 468 474, Zlesak, D.C. 2012 Physocarpus opulifolius (L.) Maxim Donna May: A new compact, purple-leafed landscape shrub HortScience 47 1372 1374. Powdery mildew is a fungal disease that causes a grayish white powdery growth on the leaves and stems of ninebark. Clusters of white flowers cover the plant in late spring, and these age to attractive red seed heads. Physocarpus opulifolius, Compact bushy habit, 3-4 feet tall and wide. Create a naturescape, combining ninebark with other regional natives to benefit wildlife and pollinators. Lebeda et al. Alternate, 3 to 5 lobed simple leaf. Featured in: Garden Design's Top 10 Garden Trends for 2022 ("Designing with Dark Foliage"). Come discover lush, green landscapes, and find respite and inspiration in the shade of towering trees. Since the shrub blooms on old growth, pruning and shaping it each fall helps flowers proliferate. The flowers are attractive to butterflies and other insect pollinators, while cut branches can be used as filler in floral arrangements. Address:6885 160th St WApple Valley, MN 55124, Current HoursMON-SAT: 9am to 8pmSUN: 9am to 6pm, Pahls Market 2023 All Rights Reserved | Best in Market, 2023 CSA Enrollment Now Open! & Shishkoff, N. 2001 Resistance to triadimefon and benomyl: Dynamics and impact on managing cucurbit powdery mildew Plant Dis. 1.) <, Electrostatic spraying effect on spray deposition and powdery mildew control in soybean, Management of powdery mildew in greenhouse tomato production with biorational products and fungicides, Evaluation of fungicide rotations at different application intervals for the control of powdery mildew of dogwood, 2017. * Required | We will never sell or distribute your email to any other parties or organizations. 81 1432 1438, Pscheidt, J.W. University of Minnesota Extension discovers science-based solutions, delivers practical education, and engages Minnesotans to build a better future. Pale pink buds open to white flowers, with red seedheads later in the season. Physocarpus opulifolius. For shrubs with a history of disease, apply fungicides before you see disease symptoms. If the fungus spreads to cover the majority of the leafs surface, photosynthesis cannot be performed properly and the leaves may begin to fall prematurely. 9 Bark Bushes - White Powdery Fungus on leaves - Ask Extension Supply: www.forestryimages.org.
Sci. The disease is not. Uk experts recommend choosing the organic types and spraying them to your ninebarks every 10 to 14 days. Fertilizer will cause the tree to produce young shoots which are highly susceptible to powdery mildew. How to Grow and Care for Ninebark Shrub - The Spruce Use a smaller variety as edging along a pathway, as a foundation planting, or a stand-alone accent. It is a highly specialized pathogen that forms a close association with the host. Site Map, Trees, Shrubs, Roses, Vines & Groundcovers, Shrubs with Attractive Bark, Form and Thorns, Spring Flowering Trees and Shrubs Blooming in Fall. When used in a mixed border, it works well alongside lilac and spirea. By clicking Accept All Cookies, you agree to the storing of cookies on your device to enhance site navigation, analyze site usage, and assist in our marketing efforts. Make sure to use a product specifically for shrubs and trees, and one annual feeding is all that is required. There are many species of powdery mildew fungi and they affect thousands of plant species. Prune out one-third of the biggest, oldest shoots right to the ground. A good strategy for better management of powdery mildew would be adopting integrated management tools: hygiene nursery practices, using resistant cultivars, proper cultural practices, and rotation of biorational products and chemicals. On this page: The Basics | Planting | Care | Choosing the Right Ninebark | Pictures | Landscaping Tips. Summer Wine ninebark. Northward, it extends well into Canada. Reapply once every one to two weeks when weather is cool and humid. Others like to cut the bush 3 to 4 inches from the ground. White flowers; new growth emerges as greenish gold, maturing to deep burgundy red in summer, the leaves displaying all three colors as they mature. Foliage comes in shades of deep purple, burgundy, orange, green, gold and multi-hues, with many varieties exhibiting new growth that changes color as the season progresses. (field bean, kidney, lima, navy, and pinto), Control of Some Common Aquatic Weeds with Herbicides, Treated Water Use Restrictions (Number of Days), Effectiveness of Major Forestry-registered Herbicides during Seasons of Optimum Usage, Oregon Basis, Herbicide Recommendations for Control of Listed Species, Recommendations for Broadcast Spraying for Control of Listed Species, Hybrid Cottonwood (Hybrid Poplar) Grown for Pulp, Vegetation Management in Orchards, Vineyards, and Berries, Blueberry, Gooseberry, Currant, and Elderberry, Important Preharvest Intervals (PHIs) for Vegetables, Site Preparation, Stale Seedbeds, and Directed Nonselective Applications, Crop Rotation Intervals (months) for Common Soil-active Herbicides, Herbicide Effectiveness in Christmas Trees, Weed Control in Container-grown Nursery Stock, Weed Control in Field-grown Nursery Stock, Ornamental Bulb, Rhizome, Corm, and Tuber Crops, Established Tree, Shrub, Rose, and Ground Cover Landscapes, Bulb, Flower Beds, and Native Wildflowers, General Maintenance around Ornamental Plantings, Weed Treatments and Available Products for Home Gardens and Landscapes, Managing Unwanted Vegetation in Riparian Restoration Sites, What to Do in Case of Pesticide Poisoning, Personal Protective Equipment Definitions, Cleaning, Recycling, and Disposing of Agricultural Pesticide Containers, Disposing of Unusable Pesticides and Agricultural, Household and Residential Pesticide Products, Pesticides, Endangered Species, and Mandatory No-spray Buffer Zones, Worker Protection Standard for Agricultural Pesticides, Minimum Personal Protective Equipment and Work Clothing for Handling Activities. Many varieties of ninebark are used in landscaping, planted along foundations, incorporated into a hedge, or used to stabilize sloping areas, preventing erosion. I have seen quite a bit of powdery mildew on ninebark this spring. Use as a hedge, screening, or a dramatic focal point in the landscape. Dark green above and paler green beneath. How to Care for Ninebark Shrub - Gardenerdy 2017 Control of grape powdery mildew with synthetic, biological and organic fungicides: 2017 field trials. Apply fertilizer to the soil starting a few inches away from the shrub's trunk, and then spread it out in a thin layer around the base. Hort. The fungal pathogen that infects your tree and develops into this disease is Sclerotium rolfsii. It can be often found throughout the growing season. Journal of Environmental Horticulture 29:105-107. 99 544 550, Zhang, S., Mersha, Z., Vallad, G.E. Easy, durable summer color! Milwaukee, WI
0 0 Little Devil (syn. <, The effects of different biological control agents (BCAs) and plant defence elicitors on cucumber powdery mildew (, Powdery mildew control of cucurbit with organic and synthetic fungicides: 2014 field trial. However stress on the plant can occur and make it more susceptible to other infections that weaken the plant. During the growing season, prune only to remove severely infected shoots. Mildew is less of an issue on newer varieties. Ninebark flowers in late spring with clusters of white or pink blooms, and it bears red fruit in late summer and autumn, attracting birds. In early spring, as soon as the ground can be worked, separate the bundled cuttings and plant them in the soil, making sure the tops are facing up. The common name of ninebark originates from the exfoliating bark that peels in layers when plants mature. Do not fertilize infected trees and shrubs unless it is recommended by a soil test to correct a nutrient deficiency. Apply an all-purpose slow-release fertilizer in spring as needed, and mulch around the base with a thin layer of compost or fine bark. New leaves emerge as bright yellow, transitioning to chartreuse in summer. Prune the tree or shrub during winter months to increase light penetration and improve air circulation throughout the canopy. & Peck, G.M. A small, bushy 3 to 4 feet high and wide shrub with fine-textured, deep purple leaves; small clusters of white flowers bloom up and down the stems. In Minnesota, powdery mildew has been observed on the following trees and shrubs. Its water requirements are generally low, but it can deal with poor drainage and occasional flooding. <. Plant the shrub so the top of the root ball is exactly at ground level, and then backfill the root ball, making sure there are no air pockets. Powdery Mildew on Ninebark :: Melinda Myers Register now
Learn More by Pahl's Market | Mar 29, 2010 | Resources, Market News, Ask Pahl's Market, I have a center glow ninebark and have noticed that some of the leaves have a very fine white powder like substance on them. Dig a hole slightly deeper than the root ball and twice as wide. This shrub is tolerant of many climate and soil conditions and rarely requires fertilization. Tiny red fruit or seed capsules ripen in summer and fall. Possible diseases include powdery mildew, fire blight, leaf spot or witches broom. Physocarpus opulifolius, Upright compact habit, 5-8 feet tall and wide. 68 858 864, Welch, B. How to Eliminate the Powdery Mildew From Diabolo Ninebarks Ninebark, especially varieties with dark leaves), Arrowwood Viburnum and Lilac are just a few of the ornamental shrubs that are susceptible to this fungal disease. Thank you. It developed powdery mildew on some of the leaves. <, Fungicide control of powdery mildew of cucurbit: 2016 field trial. This common fungal disease displays a white, powdery growth on plant surfaces such as leaves and flowers. One of the largest varieties, Diabolo needs ample room to grow. Thoroughly spray your plants with a fungicide with an active ingredient such as sulfur, myclobutanil or triforine. Healthy specimens show few, if any problems. Spring is the ideal time to spruce up your lawn. 2011 Susceptibility of eastern ninebark (Physocarpus opulifolius (L.) Maxim.) Choose disease resistant varieties for new plantings or as replacement plants. Summer Wine - Ninebark - Physocarpus opulifolius - Proven Winners Donna May) Plant Disease Management Report OT005. Shake well just prior to spraying. This dwarf variety is a good alternative to Darts Gold for smaller landscapes. In spring, the young shoots growing from infected buds are covered with velvet-like white growth of powdery mildew. Place the pots outdoors in a sheltered, lightly shaded area where temperatures will not drop below 50 F. Maintain moist soil until the seeds start to germinate (this can take three weeks to two months), and then pluck the leggier of the two seedlings in each pot to allow the other to grow all summer long. In the paucity of knowledge for managing ninebark powdery mildew, the findings of this current study can assist woody ornamental producers for better and sustainable management of powdery mildew disease on ninebark. The white growth seen is composed of both mycelium and fungal spores. Cornell University found baking soda helped suppress powdery mildew. 85 147 154, Mmbaga, M.T. Fall color is usually a bronzy yellow. Tolerant of wet to dry alkaline soil. University of California Cooperative Extension, Department of Plant Pathology, Davis, CA. In winter, strips of old bark peel from its naked branches, revealing underbark layers of reddish- or golden-brown. The problem sounds like powdery mildew, a fungal leaf disease that looks like powdery white or grey blotches. Deep purple to nearly black foliage; flowers are white tinged with pink, red seedheads. Fungicides protect healthy green leaves and shoots from powdery mildew infection. Also effective as erosion control along a slope. The link was not copied. Shade or low light intensities also increase the development of this disease. Grown for its brilliant golden foliage, Darts Gold pairs well with purple foliaged plants such as Tuxedo weigela or Royal Purple smoke bush for a dramatic contrast in the landscape. Like many shrubs, ninebark is best planted in the early spring while the bush is still dormant. Button-like clusters of five-petaled flowers appear in late spring or summer, blooming the entire length of the branches. Recipe: 3 tablespoons baking soda plus 1 tablespoon of Murphy's oil soap, dish soap, or a lightweight horticultural oil in 1 gallon of warm water. Academic Press, San Diego, CA, Zeng, F., Arnao, E., Zhang, G., Olaya, G., Wullschleger, J., Sierotzki, H., Ming, R., Bluhm, B., Bond, J. Ninebark prefers moderately moist, well-draining soil with a pH that is neutral to slightly acidic. Spores spread by wind and start new infections within the plant or in neighboring plants. Ixonia, WI
Foliage of cultivars varies in size and color from purple to lime green. In a sunny to lightly shaded site with fertile, well-draining soil that will stay evenly moist. Ninebark shrubs are susceptible to powdery mildew. Upright, spreading reaching 6 to 8 feet high; new foliage is copper changing to reddish-bronzy. It is recognized by the white, powdery patches that develop on leaves and stems. Once the leaves have dropped, the bark and structure are revealed, lending beauty in the landscape that lasts all winter long. Provide adequate air circulation by properly spacing and locating plants, as you did, to reduce the risk. PCR protocols: a guide to methods and applications. For this reason, many gardeners prefer ninebark to barberry bush, which is becoming invasive in many regions. InTech, Rijeka, Croatia, extract elicits SA-dependent defense responses in courgette genotypes against powdery mildew caused by, Resistance to triadimefon and benomyl: Dynamics and impact on managing cucurbit powdery mildew, Evaluation of biorational products for powdery mildew management in, National Center for Biotechnology Information, Pubchem compund summary for CID 159762, sodium percarbonate. Coppertina Ninebark Information - How To Grow A Coppertina Ninebark Shrub Jefam) For a more natural approach, you may combine 1 gallon of water with 1 1/2 tbsp baking soda and 3 tbsp lightweight horticultural oil for use in place of chemical fungicides, according to the University of Wisconsin Extension. & Hoebeke, E. 1985 The insect fauna of ninebark, Physocarpus opulifolius (Rosaceae) Proc. May 3, 2023
They must be applied before disease becomes severe. Having white fungus in fish tank is definitely a cause for worry. Ninebark ( Physocarpus opulifolius) is a popular ornamental shrub and considered a hardy and tough plant that can thrive in different environmental conditions and resist diseases. Tiny, white flowers in 2 inch clusters. Once the branch has developed ample roots (it can take a full growing season), snip it free from the mother plant and transplant the rooted cutting elsewhere. Provide mulch around the base annually to help the plant retain moisture and to prevent weeds. Powdery mildew is mostly a cosmetic problem on many plants; however, on ninebark it can cause serious leaf loss and even branch tip dieback. Your email address will not be published. Store the cuttings in the refrigerator to keep them dormant. Jugglerguy alpena, mi (zone 4b) might 22, 2007. Divide the mixture into 5-inch pots and sow two seeds per pot at 1/8 inch depth. Susceptibility of eastern ninebark (Physocarpus opulifolius (L.) Maxim.) White flowers, red stems. This mid-sized variety makes a valuable addition to any landscape, as hedging, in a mixed border, or a stand-alone accent. Plant a row along a property line for privacy screening, and to define the border. 2010 Fungicide resistance in cucurbit powdery mildew fungi, p. 221246. The weather conditions have been right for this disease to occur. Ninebark needs ample sunlight in order to show its beautiful white blooms each spring. Register now
Powdery mildew thrives in humid conditions but does not do well if leaves are wet from frequent rain or irrigation. Put on the protective clothing and gear; it guards against skin, eye and respiratory irritation from the drifting spray. Do not overcrowd plants. Powdery mildew is a common fungal disease of trees and shrubs in Minnesota. High-Impact Native American Shrubs - Ecological Landscape Alliance Combine with gold or chartreuse-foliaged plants such as Goldmound spirea or Rubidor weigela for dynamic contrast. May 20, 2023
Privacy Policy | Upright, 8 to 10 feet high, dark purple leaves, pinkish-white flower clusters in early to mid summer. The University of Minnesota is an equal opportunity educator and employer. Mulch with organic matter such as wood chips to suppress weeds and retain moisture. Pruning can cause the tree to produce new shoots which are highly susceptible to powdery mildew. Learn tips for creating your most beautiful home and garden ever. Witches' brooms consisting of light pink to white colored, thickened shoots with stunted leaves also occur. Grow purple ninebark in areas that offer full sun to partial shade for best growth, advises the University of Illinois Extension. Spray liberally, getting top and bottom leaf surfaces and any affected areas. Rounded, 3 to 4 feet high and wide; deep burgundy leaves with clusters of pinkish-white flowers. In late fall or early winter, cut several pieces of hardwood branch (not softwood tips) from your shrub. Academic Press, San Diego, CA, Characterization of quinone outside inhibitor fungicide resistance in, and development of diagnostic tools for its identification, Management of powdery mildew in squash by plant and alga extract biopesticides, Evaluation of whole effluent toxicity data characteristics and use of welchs t-test in the test of significant toxicity analysis, (L.) Maxim Donna May: A new compact, purple-leafed landscape shrub, Journal of American Society for Horticultural Science, Diversity & Inclusion Statement/Code of Ethics, National Center for Biotechnology Information, 2020, Fungicide Resistance Action Committee, 2020, https://ucanr.edu/sites/eskalenlab/files/311062.pdf, https://www.frac.info/docs/default-source/publications/frac-code-list/frac-code-list-2020final5d632b2c512362eb9a1eff00004acf5d.pdf?sfvrsn=f940499a_2, http://plantpathology.ucdavis.edu/intranet/199597.pdf, https://pubchem.ncbi.nlm.nih.gov/compound/Sodium-percarbonate, https://ucanr.edu/sites/eskalenlab/files/311057.pdf. The fungicides and biorational products should be applied by combining or rotating for effective suppression of disease and to avoid the chance of the development of pathogen resistance. Pinus albicaulis - Wikipedia Physocarpus opulifolius, Upright habit, 5-6 feet tall and 3-4 feet wide. Powdery mildew fungi create dark round resting structures that contain and protect spores through the winter.
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