Lilac Problems
Symptoms	Probable Causes
Leaves Covered With White Powder	Powdery Mildew
Leaves Encrusted With Small Bumps	Lilac Scale
Branches Wilt and Break Easily	Borers
Leaves Turn Yellow	Soil Too Alkaline
Leaves Curled And Distorted	Aphids
Leaves Mined; Covered With Webs	Leaf Miners
Leaf Margins Notched	Weevils
Brown Spots; Discolored; Holes On Leaves	Fungal Diseases
Leaves Turn Yellow Or Brown	Verticillium Wilt
Shoots Branch From Lateral Buds	Witches' Broom
Shrub Is Stunted	Too Close To Black Walnut
Young Leaves Thicken; Curl; Die	Herbicides In Lawn