Choristoneura modesta

Cecidomyiidae

Asteromyia

Erigeron annuus

Michigan

Erigeron canadensis

Alabama

Alaska

Arizona

Arkansas

California

Colorado

Connecticut

Delaware

District Of Columbia

Florida

Georgia

Idaho

Illinois

Indiana

Iowa

Kansas

Kentucky

Louisiana

Maine

Maryland

Massachusetts

Minnesota

Mississippi

Missouri

Montana

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Nevada

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New York

North Carolina

North Dakota

Ohio

Oklahoma

Oregon

Pennsylvania

Rhode Island

South Carolina

South Dakota

Tennessee

Texas

Utah

Vermont

Virginia

Washington

West Virginia

Wisconsin

Wyoming

Alberta

British Columbia

Manitoba

New Brunswick

Newfoundland and Labrador

Northwest Territories

Nova Scotia

Ontario

Prince Edward Island

Quebec

Saskatchewan

Saint Pierre and Miquelon

Erigeron speciosus

Erigeron strigosus

Hawaii

Puerto Rico

Solidago altissima

Solidago flexicaulis

Solidago gigantea

Solidago macrophylla

Solidago ohioensis

Symphyotrichum cordifolium

Symphyotrichum lateriflorum

Asteromyia modesta

"In typical galls of *A. modesta* there is usually some purple on the gall or on the surrounding area. In the latter case, the tissue immediately above the larva remains green. On *Grindelia* the gall tissue is occasionally hardened but there is no carbonaceous material typical of the other species of *Asteromyia*. There is only 1 larva/gall."

[Host records: *Conyza canadensis*, *Erigeron strigosus*, *Grindelia hirsutula*, *G. humilis*, *G. robusta*, *G. squarrosa*, *Solidago flexicaulis*, *S. macrophylla*]

[See [this page](https://www.gallformers.org/gall/3385) for the *Grindelia* galls]

A Taxonomic Revision of the Genus Asteromyia (Diptera: Cecidomyiidae)

This species is less common on goldenrod than *A. carbonifera* and, unlike the latter, does not have a fungus associated with it but lives simply in the mesophyll layer of the leaf and forms only a single convexity on the leaf. Hosts *Erigeron* spp., *Conyza* spp, *Grindelia* spp.

Blisters are often inconspicuous unless discolored... This gall midge is multivoltine, each succeeding generation appearing on newer leaves.


The plant-feeding gall midges of North America

*Asteromyia* species were identified using characters of mature larval and pupa (particularly the shape of the sternal spatula) using Gagné (1968) and with reference to gall morphology and host-plant affiliation (Gagné, 1968, 1994). All galls were categorized as to whether a thick mat of fungal hyphae or hyphal stroma was present or absent.
...
[from Appendix A – "Samples used mtDNA analyses with host-plants, collection site, and Genbank accession number", hosts sampled included: *Erigeron canadensis*, *Erigeron annus*, *Solidago altissima*, *Solidago flexicaulis*, *Solidago gigantea*, *Solidago ohioensis*, *Symphyotrichum cordifolium*, *Symphyotrichum lateriflorum*, *Symphyotrichum* sp.]

Evolutionary diversification of the gall midge genus Asteromyia (Cecidomyiidae) in a multitrophic ecological context

...**modesta**. Widespread eastern Nearctic, Brazil (Minas Gerais), Argentina (Buenos Aires). *Conyza canadensis [Erigeron canadensis]*; *Erigeron strigosus* (Asteraceae).

[They omit previous host records in *Solidago* and *Grindelia* in this catalog entry. The *Grindelia* omission aligns with their acceptance of *Asteromyia grindeliae* (presumably those galls belong to that species, which was previously held by Gagné to be a synonym of *A. modesta*), but the *Solidago* omission is less clear. The *Solidago* host records given in earlier resources are therefore provisionally retained here.]

A Catalog of the Cecidomyiidae (Diptera) of the World 5th Edition - 2021

This specimen [one adult] emerged from an inconspicuous spot gall in a leaf of *Erigeron speciosus* (Lindl.) DC. (Asteraceae) that was collected to rear a leafminer (Fig. 7).

Miscellaneous Records of Cecidomyiidae (Diptera) from the USA