How do you control scale on a magnolia tree?

Asked July 10, 2015, 10:56 AM EDT

How do you control scale on a magnolia tree? I noticed a severe infestation on a part of my magnolia tree a week ago. We trimmed off the branches that were badly infested but still have some scale throughout the tree. We also treated with an insecticidal soap. Is there anything more we can do?

Black Hawk County Iowa

1 Response

To control magnolia scale, remove and destroy heavily-infested branches. Treat with a contact insecticide (horticultural oil, insecticidal soap, other synthetic insecticide) or a systemic insecticide (imidacloprid) in late August or early September. Dormant horticultural oil can also be used in late fall or early spring.