I have a six year old Hydrangea that up until this year has been healthy. It is from Endless Summer. I'm in zone 6a.
I noticed in the last week or two that it has a blackish brown spot. It starts at the edges.
I'm not sure if it's a bug (I found a small black and green beetle on it today) Or a mildew or fungus. At first I thought fungus but now I'm leaning toward insects since it's not powdery or noticeably mildewy.
Help! Please. What's happening and how can I stop it?
Did you look at the underside of the leaves? That's where most (common) insects will be found. We have had so much rain this spring that I have seen more insects on my tropical plants' leaves than I have ever seen before. Most have been mealy bugs and white flies but these insects are never found on the top of the leaves.
Ken
