Location: Southern Horticultural Research
Title: Rosette (Double Blossom) Author
Submitted to: Compendium of Blackberry and Raspberry Diseases and Insects
Publication Type: Book / Chapter
Publication Acceptance Date: August 18, 2009
Publication Date: N/A
Technical Abstract: Rosette, or double blossom, is a serious disease of erect blackberries that is limited to the genus Rubus. Rosette may occur on trailing blackberries and dewberries, but rarely on red and black raspberries. In the United States, rosette occurs from New Jersey to Illinois and southwest to Texas and is considered a major disease of blackberries in the southeastern U. S., but it has not been reported from the Pacific Coast. Rosette was described on boysenberries in New Zealand in the early 1980’s as Boysenberry Decline and has since been reported in other countries where erect blackberry cultivars are being grown including Mexico and Chile. Losses from rosette are reduced yield, poor quality fruit, and (in severe cases) the death of canes. This review lists symptoms, disease cycle, and control options.