Rose Black Spot (Roses)


Black Spot


Description: Primarily affects roses. At first, lower leaves

of susceptible plants become covered with brownish black

spots; eventually they yellow and drop off. A severe

infestation can completely defoliate a plant over a

period of weeks. Disease spores are spread by rain and

irrigation; black spot spreads quickly in wet or humid,

warm weather.

Solution: Avoid

wetting foliage. Prune plant to allow good air circulation

among branches. At the first sign of disease, remove

infected leaves and begin using Soap-Shield® Fungicidal Soap,

Liquid Sulfur or Micronized Sulfur on a regular basis

for control. Clean up any dead leaves from the base

of plants (don’t compost dead or diseased leaves), especially

in fall.


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