Burr Gall Midge

Allomyia juniperi

Cecidomyiidae

Oligotrophus

Juniperus californica

Arizona

California

Colorado

Idaho

Montana

Nevada

New Mexico

Oregon

Utah

Washington

Wyoming

Juniperus osteosperma

Juniperus spp

Oligotrophus juniperi

Allomyia juniperi ... 

The gall is a small, apical, burr-like deformity with a diameter of 5 mm. It differs from the larger rosette galls in that there are no distinctly reflexed leaves. 

New gall midges (Dipt.).

Oligotrophus juniperi

Gall burrlike, the leaves short, pointed

Host: Juniperus sp.

Distr: Colorado

The plant-feeding gall midges of North America

Oligotrophus juniperi
Burr Gall Midge
[Page 80]

This midge induces rounded galls with an open apex and flaring bracts, spreading in all directions, on the whorled leaves of Utah and California junipers. 

Hosts:
Juniperus californica 
Juniperus osteosperma


Plant Galls of the Western United States

Oligotrophus juniperi
Burr Gall Midge

20mm wide burr-shaped leaf gall with flaring bracts appearing on California and Utah junipers. 

[Photos of this gall can be found in Ronald Russo's Field Guide to Plant Galls of California and Other Western States (2006) on page 110 and in his 2021 publication, Plant Galls of the Western United States, on page 80.]

Hosts:
Juniperus californica
Juniperus osteosperma

Gallformers ID Notes