Rosa 'Madame Isaac Pereire'

Rosa 'Madame Isaac Pereire' was bred by Armand Garçon in France. It is a bourbon climber rose.

Rosa 'Madame Isaac Pereire' has one of the strongest scents in the garden. Its flowers are heavily perfumed and are easily a crowd favorite for that reason. Unfortunately, it does suffer from black spot (Diplocarpon rosae), that can  cause it to drop its leaves and result in it appearing bare during the heat and humidity of the summer. It is a strong performer in the spring, but can become unattractive as the year carries on.

Black spot can cause leaves to develop black spots with blurred edges, yellowing leaves, and eventually partial or entire defoliation. While black spot is rarely fatal, it can weaken the rose by reducing its leaves and therefore its ability to photosynthesize. Although similar in appearance to cercospora leaf spot, black spot can be distinguished by the less defined and more feathered edges of the spots. As with many fungal problems, issues are generally worse in areas with high humidity. Black spot can be treated chemically.