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Symptoms: Primarily affects roses. At first, lower leaves of susceptible plants become covered with brownish-black spots; eventually the leaves 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.

Solutions: Avoid wetting foliage. Prune plant to allow good air circulation among branches. At the first sign of disease, remove infected leaves and begin spraying a sulfur-based fungicide or a soil inoculant every 5-7 days for control. Clean up any dead leaves from the base of plants (don’t compost dead or diseased leaves), especially in fall. We recommend Plant Guardian™ Biofungicide Liquid Concentrate or Sulfur Guard™ Fungicide.

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