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Cicada Flagging: Brown Leaf Clusters on Chicago Trees

Egg-Laying Damage, Not Fatal

Brown, dead twig clusters ("flagging") on oaks and other trees after cicada emergence. Females slit ¼–½" twigs to lay eggs. Twigs wilt, die, may break. Young trees (<4 yrs) most affected. Trees outgrow damage; no treatment needed.

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