Raspberry Cane Spot

Raspberry cane spot Common name Raspberry cane spot Causal agent It is a fungal disease caused by a member of the family, Mycosphaerellaceae. It commonly affects young leaves, making primocane lose 75% of their leaves. Scientific name Sphaerulina rubi Symptoms & Signs Raspberry cane spot is identified by means of small black or dark green spots on the upper side of the leaves. The center of the spots eventually falls off, leaving behind holes in the leaves. In case of severe infection, the leaves may curl and fall off entirely. The spots can also spread to the canes, enlarging to form cankers. Transmission The spores travel by means of water; hence, summers with heavy rains cause the most damage to the plants. Time of concern Spring to late summer Common hosts Raspberries