Magnolia Branch Flagging: Black Twig Borer, Not Twig Girdler

Brown leaf clusters on magnolia indicate black twig borer damage—not twig girdler. The distinction matters: girdlers leave clean, conical cuts and abundant fallen twigs; borers leave hollowed twigs that often remain attached.

Management

Prune and destroy affected twigs. No effective spray reaches borers inside stems. Monitor for recurrence on magnolia and other susceptible hosts (hydrangea, buckeye, boxwood, etc.).