"Adults were reared from Grindelia squarrosa (Pursh) Dun., and Haplopappus ciliatus (Nutt.) DC. [note: as of 2022 POWO lists this as a synonym for Grindelia ciliata]

"The opening of the adult exit to the outside is located in the upper one-third of the gall...the larva covers the opening with a cap consisting of plant tissue fragments interwoven with silk. The cap, which is pliable when touched with an insect pin, is conspicuous at completion, but dries and weathers so that it later blends more the the gall exterior."

"...galls usually occur singly on Grindelia squarrosa main stems, sometimes also on larger lateral branches..."

"mature gall vertically symmetrical"

- William E. Miller: (2000) A Comparative Taxonomic-Natural History Study of Eight Nearctic Species of Gnorimoschema that Induce Stem Galls on Asteraceae, Including Descriptions of Three New Species (Lepidoptera: Gelechiidae)^©