Pests on magnolia
Something is eating my magnolia and the leaves appear to be eaten in a lace like manner. I keep scanning the tree to find what is eating the leaves, but I can't see anything, though the leaves are left in a lace like pattern. The tree is in a large pot on the patio.
This could be Leaf Miners, or several other insects that dine on the leaves.
Treat with Neem Oil and I would treat weekly during the growing season to prevent further insect damage.
Here is a few links for you with more information.