Female Cicadas Cause Branch Flagging

Photo shows female periodical cicada cutting slits along a tree branch

Female periodical cicadas make small cuts along twigs and deposit their eggs in the slits, which look like a kind of “zipper line” on the twig. Winds break the weakened twigs, and litter yards with small branches. On mature, vigorous trees, the cicada-caused wounds will heal, and branches will continue growing.

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http://mdc.mo.gov/node/15273