Resistance is available for this disease. Blueberry Stunt is caused by a phytoplasma. Stunt is an important disease of blueberry throughout the United States and Eastern Canada. Symptoms are most noticeable during mid-June and late September. The infected bushes can be less than half the size of healthy ones.
Leaves are small and are cupped downward.
Leaves are yellow along the edges and between the veins, giving them a mottled appearance. Yellow areas of the leaves will turn brilliant red early in the fall, before the leaves of healthy plants. Few berries are produced, and these are small, hard and tasteless. They ripen late, if at all, and will cling to the bush much longer than berries on healthy plants. These leafhoppers also feed on pin cherry, black cherry, chokecherry, dewberry, wild raspberry, and blackberry.