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Rosette (fungus - Cercosporella
rubi): This disease is also called double blossom or witches' broom. Symptoms
appear in the spring as bunches or clusters of foliage at terminals or along
fruiting canes.
Flower
buds are larger and redder than normal. Petals may be purplish, and
sepals are much elongated. Infected flowers do not set fruit. Control rosette
by removing infected canes as soon as they become noticeable. Destroy all
wild berry plants in the vicinity. Remove and burn all fruiting canes soon
after harvest and keep plants adequately spaced for good air circulation.
Where heavy infection has occurred, mowing all canes to the ground may be
necessary. The new thornless blackberry varieties, Navaho and A