Hydrangea Seemannii – Infestation

Question

My plant has some sort of infestation which I can’t pinpoint – some leaves have holes in them, others look dried out. Could you please advise what this could be and what I could do about it? Many thanks in advance 🙂

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Answer 1

This, actually, looks to be downy mildew. Here is an article that will give you more information and ways to treat it:

https://www.gardeningknowhow.com/plant-problems/disease/downy-mildew.htm