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Photo#1790184
Cecidomyiinae in Jewelweed

Cecidomyiinae in Jewelweed
100 Acre Wood, Winneshiek County, Iowa, USA
August 30, 2019
August 30, 2019: looking at the stems of Jewelweed, Impatiens palida, for signs of life paying some attention to the swollen portions. Although they appeared to be just the way the plant grows, one swollen side branch node had a dark spot. Opened it to a fly larva, taped the plant back together.
August 31, 2019: plant was drying out. Put larva into alcohol.

The Plant-feeding Gall Midges of North America by R. Gagné references a fly on Jewelweed: "Swollen stem base ... Lasioptera centerensis. Known only from a larva, this species was reported, once, from a "double-celled" gall. Host: I. palida. Distr: New York."

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Cecidomyiinae in Jewelweed Cecidomyiinae in Jewelweed Cecidomyiinae, larvaX