During the blueberry growing season, you will be concerned about several foliar diseases of blueberry, including:
These diseases should be treated for preventatively, even if they are not prevalent in your field. During fruiting and even through harvest, use fungicides with pyraclostrobin (FRAC code 11) and boscalid (FRAC code 7) to prevent the diseases listed here. Make one application and, then, wait and scout your field for the presence of any foliar diseases. Do not make more than one application unless leaf symptoms begin to develop.