Cercosporella rubi
Encyclopedia
Cercosporella rubi is a plant pathogen which causes rossette disease of blackberry
. The disease is a particular problem in the southeast of the USA. The disease causes witch's broom
symptoms as well as double blossoms, and can severely reduce yield.
Blackberry
The blackberry is an edible fruit produced by any of several species in the Rubus genus of the Rosaceae family. The fruit is not a true berry; botanically it is termed an aggregate fruit, composed of small drupelets. The plants typically have biennial canes and perennial roots. Blackberries and...
. The disease is a particular problem in the southeast of the USA. The disease causes witch's broom
Witch's broom
A Witch's broom is a disease or deformity in a woody plant, typically a tree, where the natural structure of the plant is changed. A dense mass of shoots grows from a single point, with the resulting structure resembling a broom or a bird's nest....
symptoms as well as double blossoms, and can severely reduce yield.