The cane may break off at the gall, or it may turn a reddish colour above the gall. These canes will be unproductive or die before harvest this year. They should be pruned out and destroyed to reduce the levels of this pest in your planting. Insecticides at this time are not effective. The first spray for blueberry growers is a fungicide for mummy berry.
Early infection causes new shoots to die.
Later symptoms are pink or white berries that shrivel up on the bush. These berries produce small mushroom like structures in the soil in early spring. Topas fungicide was recently registered for control of this disease on highbush blueberries. Funginex is still available. Bird control for blueberry growers begins now.