The ivory silk lilac (Syringa reticulata) bears white flowers in early summer. It grows well in USDA zones 3 to 6, but it can develop leaf problems from various sources.
Lilac leaf miners attack the leaves of ivory silk lilacs in early summer. They create small linear tunnels on the bottom surface of leaves, then emerge as caterpillars from curled, damaged leaves. They eventually skeletonize affected leaves.
Various fungal diseases can cause ivory silk lilac leaves to develop spots on the leaves. The leaves turn black and die with bacterial blight and phytophthora blight. Leaf blotch causes brown spots to develop and fall out of the leaves.
Mildew and Wilt
Powdery mildew covers the leaves of ivory silk lilacs with white, powderlike material. It often attacks plants that grow in the shade, especially during rainy weather. Verticilium wilt causes leaves to wilt and prematurely drop.