Powdery Mildew-Resistant Woody Ornamentals, MA Hansen

Tags: Mildew-Resistant, fungicide sprays, resistant cultivars, woody landscape plants, Ornamental Plants, Virginia Tech, Sarah Van Fleet Scarlet, Joe Voo Doo Wimi World Peace, Princess of Monaco, Jean Kenneally Jennifer Kathy Robinson Linville, ornamental plant species, fungal disease, Radiant Rose Rochester Snow Flake, Virginia State University, College of Agriculture and Life Sciences, Virginia Polytechnic Institute and State University, Cooperative Extension, Alma C. Hobbs, Department of Plant Pathology, Physiology and Weed Science, Powdery mildew, Extension Plant Pathologist, opportunity/affirmative action, Virginia Cooperative Extension
Content: publication 450-616
Powdery Mildew-Resistant Woody Ornamentals Mary Ann Hansen, Extension Plant Pathologist, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech
Powdery mildew is a common fungal disease of many ornamental plant species. Although plants are not often killed by the disease, they may become unsightly when heavy fungal growth develops on leaves and flowers. Controlling the disease on susceptible plants usually requires multiple sprays of an appropriate fungicide. Use of resistant cultivars in new plantings can significantly reduce plant maintenance related to powdery mildew control. Assembled below are lists of species, cultivars, and/or hybrids of some of the more popular woody landscape plants that are reported to have resis-
tance to powdery mildew (Tables 1-5). This information was compiled from several different landscape and field studies in which resistance to powdery mildew was evaluated.** Although the exact level of powdery mildew resistance exhibited by an individual cultivar may vary depending on where the plant is grown, all the plants listed should have moderate to excellent resistance and a reduced need for fungicide sprays. For more information on powdery mildew, refer to VCE Publication 450-603, Powdery Mildew of ornamental plants.
Table 1. Powdery mildew-resistant dogwood cultivars
Flowering Dogwood (Cornus florida) Cherokee Brave Sweetwater Red Rutger's Hybrids (Cornus florida x Cornus kousa) Aurora Celestial Stellar Pink Kousa Dogwood (Cornus kousa) Angustata Autumn Rose Benji Fuji Big Apple Blue Shadow China Girl Chinensis Bodnant Doubloon Emerald Star
Form Gay Head Greensleeves Hart #3 Julian Milky Way Milky Way Select Miss Satomi Moonbeam National Radiant Rose Rochester Snow Flake Speciosa Summer Majesty Sunsplash
Temple Jewel Trinity Star Triple Crown Weavers Weeping Wilton Wolf Eyes
www.ext.vt.edu Produced by Communications and Marketing, College of Agriculture and Life Sciences, Virginia Polytechnic Institute and State University, 2009 Virginia Cooperative extension programs and employment are open to all, regardless of race, color, national origin, sex, religion, age, disability, political beliefs, sexual orientation, or marital or family status. An equal opportunity/affirmative action employer. Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. RIck D. Rudd, Interim Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; Alma C. Hobbs, Administrator, 1890 Extension Program, Virginia State, Petersburg.
Table 2. Powdery mildew-resistant rose cultivars
Floribundas Class Act Escapade French Lace Iceberg Intrigue Koricole Lavaglut Playboy Playgirl Regensbery Rob Roy Sarabande Sexy Rexy Simplicity Sun Flare Sunsprite Traumerei Grandifloras Love Prima Donna Sonia Hybrid Teas
Bobby Charlton Bride's Dream Canadian White Star Cary Grant Chablis Dainty Bess Duet Electron Elina Elizabeth Taylor Elmhurst Folklore Helmut Schmidt Keepsake Konrad Henkel Lady Lady Rose Lady X Las Vegas Maid of Honor Mikado Miss All American Beauty
modern art Mon Cheri Nantucket New Year Olympiad Otto Miller Pascale Polarstern Precious Platinum Princess of Monaco Pristine Red Devil Sheer Bliss Suffolk Sunbright Tansinnroh Uncle Joe Voo Doo Wimi World Peace Miniatures Always a Lady Angel Darling
Anytime Beauty Secret Black Jade Centerpiece Cinderella Cuddles Deep Velvet Ginny Green Ice Heartland Jean Kenneally Jennifer Kathy Robinson Linville Loving Touch Magic Carrousel Mary Bell Minnie Pearl Old Glory Peacesetter Puppy Love Queen City Red Flush
Singles Better Smoky Mountain Sweet Pickins Watercolor Shrub Roses Alba Mediland Albo Semi-plena Blanc Double de Coubert Bonica Frau Dagmar Hartopp Linda Campbell Pink Meidiland Roseraie de l'Hay Rugosa Alba Sarah Van Fleet Scarlet Meidiland Topaz Jewel Simplex
Table 3. Powdery mildew-resistant lilacs (Syringa species and hybrids) S. diversifolia S. emod S. henryi `White Summers' S. josiflexa `Anna Amhof' S. josiflexa `Royalty' S. julianae S. meyeri `Palibin' S. microphylla S. microphylla `Superba' S. oblata var. dilatata S. patula `Miss Kim' S. persica (= S. x persica) S. refexandowii S. reticulata `Summer Snow' S. swegiflexa (=S. x swegiflexa) S. villosa S. yunnanensis S. x prestoniae `Donald Wyman' S. x prestoniae `James McFarlane' S. x prestoniae `Minuet'
Selected References Dirr, M.A. 1998, Manual of Woody Landscape Plants, 5th ed. Stipes Publishing, Chanpaign IL. 1187 pp. 2
Table 4. Crape myrtle cultivars tolerant or resistant to powdery mildew
Cultivar Acoma Apalachee Biloxi Catawba Cherokee Comanche Hopi Lipan Miami Muskogee Natchez Osage Pecos Powhatan Seminole Sioux Tuscarora Tuskegee Wichita Yuma Zuni
Flower white lt lavender pale pink dk purple bright red coral pink pink med lavender dk pink lt lavender white pink pink lt lavender pink dk pink dk coral pink dk pink-red lt magenta med lavender med lavender
Twig/Bark/Inner Bark
Fall Color
purple/brown/lt gray red/gray brown/cinnamon gray brown/dk brown tan/buff brown/gray brown/ gray orange red/gray brown/lt gray red purple/gray/green-mottled white gray brown/gray green/ dk brown med brown dk cinnamon
dull orange
upright lg shrub
yellow to red
dk orange to dk purple sm tree
upright shrub
orange to red
sm tree
shrub/sm tree
red purple/gray brown/ chestnut brown red
red/gray/dk brown
sm tree globose shrub globose
dull red/gray brown/ lt gray brown lt brown
maroon to red orange-red
globose upright sm tree sm tree
gray/tan red purple/gray/ dk mahogany red purple/gray/lt gray
orange-red russet/ mahogany yellow to orange
broad tree sm tree
red/gray/lt brown
dk red
Table 5. Powdery mildew-resistant crabapple cultivars
Bud/Flower Color
Adirondack Ames White Autumn Glory Baskatong Beauty Coral Cascade David Donald Wyman Gibb's Golden Gage Golden Raindrops Gwendolyn Harvest Gold Indian Summer Molten Lava Mount Arbor Special Naragansett Prariefire Professor Sprenger Purple Prince Red Snow Tina Wies
carmine/white pink/white red/white dk red/lt purple red rose pink/white coral red/white pink/white pink/white pink/white pink/white pink/pink white/white red/rose red red/white carmine/pink red/white red/dk red pink/white carmine/red orange-red/pink red/white pink/pink
Fruit Color orange-red yellow orange-red dk purple red dark red coral pink scarlet bright red yellow golden yellow red gold red red-orange red cherry red red-purple yellow-pink bl-purple bright red red dark red-purple
Form sm columnar round upright tree fastigiate med weeping round upright sm rounded sm rounded upright broad/globe spread wide/weeping small rounded rounded upright-spreading rounded sm arching dwarf, low spreading upright
**The information presented in Tables 1-5 was complied from surveys and field trials conducted in Tennessee, Maryland, and North Carolina between 1990-1996. Information from a 1980 crabapple survey conducted in Pennsylvania is also included. 3

MA Hansen

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