Bluegrass Webworm Moth (Parapediasia teterrellus) lives in grasslands and fields across North America. It feeds on grass and leaves.
Fascinating facts about the Bluegrass Webworm Moth
- The bluegrass webworm moth was first described in 1821 from Georgia, making it one of the earliest pyralid moths recorded in North America. That early record demonstrates its presence since the continent's first entomological surveys. Over the following two centuries the species has spread across the continent, now occupying a range that stretches from Ontario and New England down to Florida and westward to California and Nebraska.
- Records show the moth appeared in the Southwest during the 1930s-40s, with specimens collected in Albuquerque, NM and Tucson, AZ between 1935 and 1940, then in Los Angeles in 1954 and finally in the San Francisco Bay area in 1988. These city sightings map a rapid westward expansion that followed human settlement patterns.
- In urban lawns the bluegrass webworm moth has displaced the native moths Tehama bonifatella and Crambus sperryellus, becoming the dominant webworm in those habitats. This takeover reflects a competitive advantage in city grass environments, where the species thrives alongside human-maintained turf. Its dominance in these settings underscores how the moth has adapted to and benefited from the spread of lawns across North America.
- Adults of the bluegrass webworm moth take to the wing from May through October, completing two full generations in that span. Their modest wingspan of about 21 mm allows them to manoeuvre easily among lawn grasses during this period. The timing of their flight matches the growing season of their host plants, ensuring that larvae have fresh foliage to consume.
- Parapediasia teterrellus has been introduced to Japan and eastern China, where it now behaves as an invasive species. Its successful establishment far from its native range shows the moth's capacity to thrive in new environments beyond North America. In its home continent the species occupies a broad belt from Ontario and New England down to Florida and westward to California and Nebraska, a distribution that was reshaped by human settlement.
Sources
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At a glance
RangeNorth America
HabitatGrasslands and fields
DietGrass and leaves
About the Bluegrass Webworm Moth
As the sun dips below the horizon, the Bluegrass Webworm Moth stirs, its delicate wings unfolding like tiny sails as it embarks on a nocturnal quest for sustenance. With a gentle flutter, it dances across the dew-kissed grasslands, its ethereal form weaving in and out of the shadows in search of the tender shoots that will fuel its existence. In this fleeting, moonlit world, the Bluegrass Webworm Moth is a whispered promise of resilience, its unassuming beauty a testament to the enduring magic that thrives in the secret hours of the night.
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