Remove and destroy prunings. After pruning fertilizer and water are needed to promote shoot growth and winter hardiness. Pruning primocanes will reduce next years yields. Another approach would be to prune and remove floricanes after harvest, then handpick infected rosettes and bloom clusters before they bloom in the spring. Chemical sprays may still be needed if rosette was severe.
Fungicides protect buds on developing primocanes.
Application of fungicides need to coincide with the presence of infected blossoms, which are the source of inoculum. Because each cultivar blooms at different periods, chemical protection may extend from early bloom into the cover sprays and even post harvest on some cultivars. Benlate 50WP controls anthracnose and rosette. In severe cases of rosette if more than the maximum legal amount of 60 oz. of Benlate is needed, protection against rosette can be extended with the use of Rovral during bloom to control Botrytis and the use of Bordeaux mixture during cover sprays. Fill spray tank to one-half the desired volume of water.