County Seat Newspaper
of Clare County

New name for a familiar pest: Gypsy moth is now spongy moth

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LANSING – On March 2, the Entomological Society of America announced a new common name for the Lymantria dispar moth. The invasive moth most familiar in its voracious, leaf-eating caterpillar stage will now be known as "spongy moth."

Formerly referred to as "gypsy moth," the hairy, yellow-faced caterpillar with pairs of red and blue spots down its back was big news in 2021 when a population explosion in Michigan caused leaf loss in oaks and other trees in infested areas.

Spongy moth is now the approved common name in the ESA Common Names of Insects and Related Organisms List. The old name was removed from this list in July 2021 because it contained a derogatory term for Romani people. The move is part of the society's Better Common Names Project.

"When an invasive species carries the name of a nation or culture, it's easy to unintentionally associate that culture with the pest's harmful effects," said Joanne Foreman, invasive species communications coordinator with the Michigan Department of Natural Resources. "We anticipate additional common name changes for other invasive species to reduce these negative connotations." The name spongy moth – derived from the common name used in France and French-speaking Canada, "spongieuse" – refers to the moth's egg mass, which has the color and texture of a sea sponge.

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