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Rose black spot is an important fungal disease of roses that is mostly active towards the end of spring. The fungus overwinters in infected plant debris from the previous season.

The fungus causes black spots to form on the upper surfaces of leaves. Defoliation can occur in heavily infected plants. Rain, overhead irrigation, and any other water-splashing sources triggers spores from infected plants debris.

Rose black spot tolerates a broad range of weather conditions, thus it allows symptoms to develop throughout the season.