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Powdery Mildew-Resistant Woody Ornamentals

ID

450-616

Authors as Published

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 resistance 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 450-603W, 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

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
Simplex
 

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


Table 3. Powdery mildew-resistant lilacs (Syringa species and hybrids)
S. diversifolia
S. emodi
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'

Table 4. Crape myrtle cultivars tolerant or resistant to powdery mildew
Cultivar Flower Twig/Bark/Inner Bark Fall Color Form
Acomawhitepurple/brown/lt grayorangesemi-dwarf
Apalacheelt lavenderred/gray brown/cinnamondull orangeupright lg shrub
Biloxipale pinkgray brown/dk brownyellow to redtree
Catawbadk purpletan/bufforange-redglobose
Cherokeebright red--globose
Comanchecoral pinkbrown/gray brown/ gray orangedk orange to dk purplesm tree
Hopipinkred/gray brown/lt grayorange-redshrub
Lipanmed lavenderred purple/gray/green-mottled whiteorangeupright shrub
Miamidk pinkgray brown/gray green/ dk brownorange to redtree
Muskogeelt lavendermed brownredsm tree
Natchezwhitedk cinnamonorangeshrub/sm tree
Osagepinkred purple/gray brown/ chestnut brownredsm tree
Pecospinkred/gray/dk brownmaroonglobose shrub
Powhatanlt lavender--globose
Seminolepink--globose
Siouxdk pinkdull red/gray brown/ lt gray brownmaroon to redupright sm tree
Tuscaroradk coral pinklt brownorange-redsm tree
Tuskegeedk pink-redgray/tanorange-redbroad
Wichitalt magentared purple/gray/ dk mahoganyrusset/ mahoganytree
Yumamed lavenderred purple/gray/lt grayyellow to orangesm tree
Zunimed lavenderred/gray/lt browndk redsemi-dwarf

Table 5. Powdery mildew-resistant crabapple cultivars
Cultivar Bud/Flower Color Fruit Color Form
Adirondackcarmine/whiteorange-redsm columnar
Ames Whitepink/whiteyellowround
Autumn Gloryred/whiteorange-redupright
Baskatongdk red/lt purple reddk purple redtree
Beautyrose pink/whitedark redfastigiate
Coral Cascadecoral red/whitecoral pinkmed weeping
Davidpink/whitescarletround
Donald Wymanpink/whitebright redupright
Gibb's Golden Gagepink/whiteyellowsm rounded
Golden Raindropspink/whitegolden yellowsm rounded
Gwendolynpink/pinkred-
Harvest Goldwhite/whitegoldupright
Indian Summerred/rose redredbroad/globe
Molten Lavared/whitered-orangespread wide/weeping
Mount Arbor Specialcarmine/pinkred-
Naragansettred/whitecherry redsmall rounded
Prariefirered/dk redred-purplerounded
Professor Sprengerpink/whiteyellow-pinkupright-spreading
Purple Princecarmine/redbl-purplerounded
Red Snoworange-red/pinkbright redsm arching
Tinared/whitereddwarf, low spreading
Wiespink/pinkdark red-purpleupright


**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.

Selected References

Dirr, M. A. 1998. Manual of Woody Landscape Plants, 5th ed. Stipes Publishing, Champaign, IL. 1187 pp.


 

Disclaimer
Commercial products are named in this publication for informational purposes only. Virginia Cooperative Extension does not endorse these products and does not intend discrimination against other products which also may be suitable.

Rights


Virginia Cooperative Extension materials are available for public use, re-print, or citation without further permission, provided the use includes credit to the author and to Virginia Cooperative Extension, Virginia Tech, and Virginia State University.

Publisher

Issued in furtherance of Cooperative Extension work, Virginia Polytechnic Institute and State University, Virginia State University, and the U.S. Department of Agriculture cooperating. Alan L. Grant, Dean, College of Agriculture and Life Sciences; Edwin J. Jones, Director, Virginia Cooperative Extension, Virginia Tech, Blacksburg; Jewel E. Hairston, Administrator, 1890 Extension Program, Virginia State, Petersburg.

Date

May 1, 2009


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