insect blight on hydrangeas
There are many fly like insects around my Nantucket Blue hydrangeas. I've begun to notice yellowing leaves at the bottom of the plant and insect damage on many of the leaves. The plants did not flower this year, but I was assuming that was because of deer damage last year.
Baltimore County Maryland
The insect in the photo is not causing any problems to your hydrangea. This is a soldier beetle, a predatory beetle that helps to control insect pests. The damage to the leaves looks cosmetic and not too serious. Pinch off the damaged leaves. Leaf scorch can be caused by cultural/environmental issues, such as poor drainage, too little or too much irrigation, too much fertilizer or too much exposure to the hot sun.