Thyridopteryx ephemeraeformis

(Haworth, 1803)
Evergreen Bagworm

Sort #: 119 | P3 #: 300028 | MPG #: 457
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Larval feeding type: Larva feeds from a large silken case adorned with pieces of the foodplant; one larva found by S.Whitebread 10-Jul-2018 produced a female moth on 4-Jun-2019! Another case found 7-Sep-2020 was thought to be empty, but a male emerged unseen, probably only a few days later. The normal life-cycle in the wild in Massachusetts remains to be resolved.
Larval substrate: Acer platanoides* (Norway Maple), Elaeagnus umbellata* (Autumn Olive), Juniperus virginiana* (Eastern Red Cedar), Malus pumila* (Apple), Prunus virginiana* (Choke Cherry), Thuja occidentalis* (Northern White Cedar), Thuja orientalis* (Chinese Arborvitae)
Phenology: Adult: 9/26 (1 record)

Status in MA (automated assessment): Fairly widespread, very common
Status in N. America: Native
MA Endangered Species Act status: None
First Year Reported: 1934
Last Year Reported: 2023

Distribution by County: Hampden, Hampshire, Worcester, Middlesex, Essex, Suffolk, Norfolk, Bristol, Plymouth, Barnstable
Number of Records: 134