Scale insects feed on sap from the tree and can stress Magnolias and lead to yellowing of leaves and twig dieback. Over time, magnolia scale will lead to the tree’s decline. It’s an increasingly common problem. Keeping trees in good health through proper watering, mulching and pruning is critical. Additionally, We offer a simple, effective insecticide spray treatment. Call for your Tree Care house call. 815-965-5757.