How do I treat this infected hydrangeas?

Question

Plant has been covered by dark spots and looks like big bites

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Answer 1

This looks to be Shot Hole Fungus. This will need to be treated with a fungicide. This article will help: https://www.gardeningknowhow.com/garden-how-to/info/using-fungicides-in-garden.htm

This article will give you information on the care of Hydrangea plants: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/growing-hydrangeas-hydrangea-care-guide.htm