University of Illinois Extension

Lilac

Selection Info:
Sun, moist well-drained soils, nongrafted varieties need regular pruning to maintain plant health, need modified pruning on grafted variety, white to purplish flowers in June (shrubs), tree blooms in June, flowers are & have pleasant odor.
Some Common Diseases:
Canker
Powdery Mildew
Root rot
Botrytis Blight
Bacterial Blight
Leaf spot
Wood rot
Some Common Insects and Insect-related:
Borer
Scale