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Black spot is a serious fungal disease named after the big dark splotches that can appear on rose leaves once the plant is infected. It can only thrive in warm, rainy conditions.

There are several reasons why roses may develop spots on their leaves. Wes Harvell, Rosarian at Jackson & Perkins, explains that fungal diseases like black spot, powdery mildew or rust can cause them.

He said: “Black spot is a fungal disease affecting rose bushes, manifesting as circular black spots on the plant’s leaves. If left untreated, affected leaves will turn yellow and fall off.

Roses will be protected from black spot disease if they are underplanted with a beautiful flower, according to a gardener.