What is black spot?

Black spot is the most common fungal disease that a rose bush will get and occurs during moist humid conditions. Upon infection the disease progresses from the lowest leaves upward, causing defoliation and showing the trademark black spot on the leaves which are 10-14mm in diameter.  If left untreated it will also affect the stems, thus weakening the plant. If you only have a few roses the removal of all affected leaves along with those on the ground will slow down the infection process. Spraying regularly should help combat and prevent this infection. 

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