Hydrangea
Hydrangea Pests & Diseases
- University of Kentucky - Common Insect Pests of Hydrangea
- Penn State - Hydrangea Diseases
- University of California Agriculture & Natrual Resources - Managing Pests in Gardens: Trees and Shrubs: Hydrangea—UC IPM
- Washington State University - WSU CAHNRS & WSU Extension Hortsense
- Clemson University - Hydrangea | Home & Garden Information Center