Spur blight (Didymella applanata) is a dangerous fungal disease of blackberry
Spur blight (Didymella applanata) is a fungal disease of blackberry. The disease is caused by a fungus Mycosphaerella rubina.
The winter spores are developed during the fall and early spring in the little black pustules. These spores remain immature over winter, but mature early in the spring. They are discharged in the early part of May and, falling on the young shoots, start a new infection. The summer spores bring about infection later in the season.
The first appearance of the disease is a brown or purplish-brown discoloration on the young canes just below the leaf stems. This appears... read more
The winter spores are developed during the fall and early spring in the little black pustules. These spores remain immature over winter, but mature early in the spring. They are discharged in the early part of May and, falling on the young shoots, start a new infection. The summer spores bring about infection later in the season.
The first appearance of the disease is a brown or purplish-brown discoloration on the young canes just below the leaf stems. This appears... read more