Black Spot on Roses - WAOW - Newsline 9, Wausau News, Weather, Sports

Black Spot on Roses

Nothing is as lovely as a rose.  Except when it gets black spot.  And once your plant succumbs to this disease you are most likely destined to battle it every season.

Avoid the problem by growing resistant roses.  I only grow hardy shrub roses in my garden.  No winter protection or pesticides needed for these beauties. 

If you do have black spot susceptible plants remove the leaves on the bottom 6 to 12 inches of the stem early in the season.  This reduces the fungal spores splashing from the soil, onto the leaves and infecting the plants.

Always remove and destroy infected leaves especially in the fall.  Proper spring pruning can also help reduce potential sources of this disease.

If your garden becomes infected and the plants are susceptible you may choose to spray.  Start with one of the more eco-friendly products like fungicidal soap, Neem, sulfur and baking soda.  Spray every 7 to 10 days throughout the season.

A bit more information:  You may be surprised to find a wide selection of roses that are resistant or at least tolerant of black spot.  The Knock out series of roses has become a favorite due to their long blooming disease resistant character.  Mary Ann Hansen, Extension Plant Pathologist, Department of Plant Pathology, Physiology and Weed Science, Virginia Tech put together this list of some of the roses with good to excellent resistance to black spot and powdery mildew.

Hybrid Teas
Canadian White Star
Chablis
Duet
Electron
Elmhurst
Lady
Lady Rose
Lady X
Maid of Honor
Mikado
Miss All American Beauty
Modern Art
Mon Cheri
Nantucket
Olympiad
Otto Miller
Pascale
Polarstern
Red Devil
Voo Doo
Wimi

Grandifloras
Love
Prima Donna

Floribundas
Koricole
Lavaglut
Playboy
Playgirl
Simplicity
Sun Flare
Traumerei

Miniatures
Always A Lady
Anytime
Black Jade
Centerpiece
Cinderella
Cuddles
Ginny
Green Ice
Heartland
Kathy Robinson
Mary Bell
Old Glory
Queen City
Red Flush
Singles Better
Watercolor

Shrub Roses
Alba Meidiland
Albo Semi-plena
Blanc Double de Coubert
Bonica
Frau Dagmar Hartopp
Linda Campbell
Pink Meidiland
Roseraie de l'Hay
Rugosa alba
Scarlet Meidiland
Topaz Jewel

For more gardening tips, podcasts and more, visit www.melindamyers.com

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