Lilac tree only one blossom and leaves curling

Question

The leaves are curling and seem to have holes in the leaves

Answer 1

Lilacs are generally tough and rarely troubled by disease or pests. Much more frequently, they don't flower as owners hope. This article will suggest a few reasons, and steps you can take to increase the health of your tree: https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-bush-not-blooming.htm
Spraying with neem oil will help get rid of
any bugs that might be causing holes and crinkled leaves:https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
Use oil at a rate of 2 tablespoons per gallon of water.