My lilac bushes have scalloped leaves

Question

(Casper, WY. – zone 4) The leaves are scalloped all along the outer edge of leaves.

Answer 1

You may have caterpillars eating some of the leaves. They are usually not an issue.
You can treat with Neem Oil.

Here are some links for you.

https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/common-lilac-problems.htm

https://www.gardeningknowhow.com/ornamental/shrubs/lilac/lilac-care-growing-and-planting-lilac-bush-plants.htm