Question: what could be eating my magnolia tree leaves?
Answer: Aphids. Aphids are known to attack magnolia trees, using their long mouth parts to tap into and suck the plant's fluids from the leaves and stems. ... 
Scale Insects. ... 
Magnolia Borer. ... 
Hoplia Beetle. ... 
Mealybugs. ... 
Thrips. ... 
Tulip Poplar Weevil.