Rose Chafers (beetles)
chafers are a beetle that is known for eating the flowers blossom of Hydrangea
leaving small holes in the petals. They also eat the leaves between the
veins of the plant causing further damage.
best organic way to try and prevent this is to check the plants and manually
remove them from the plant. Pesticides can also be successful and have more
Examples of Insecticides (Acephate – Cyfluthrin – Imidacloprid- Insecticidal Soap