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Photo#1621157
Stem borer, Arnoglossum - Melanagromyza

Stem borer, Arnoglossum - Melanagromyza
Quarry Hill Prairie, Winneshiek County, Iowa, USA
July 10, 2018
July 2018 The pith inside last year's long-dead flowering stalks of prairie Indian-plantain, Arnoglossum plantagineum, is riddled with insect tunnels and spent agromyzid fly puparia...the prolific flies did quite a nice job of beginning the decomposition of these stalks.

Puparium from inside one of the stalks:

Larva from inside one of the stalks:


Something similar, from a woodland Arnoglossum (different species) in 2017:

Images of this individual: tag all
Stem borer, Arnoglossum - Melanagromyza Stem borer, Arnoglossum - Melanagromyza