Picture on the Wing

Black Onion Fly

Black Onion Fly

The Black Onion Fly, aka the Onion bulb maggot, Tritoxa flexa, has been reported in North American entomological publications dating to the 1865. The black onion fly is mentioned as an occasional pest of onions that can cause some damage to the bulbs, but has never been elevated to “serious” pest status.

The flies are known as “picture wing flies” of the family Ulidiidae (formerly placed in Otitidae and Ortalidae). The wings have interesting patterns which possibly have a role in mating and mate recognition. These flies are not uncommon in gardens of the Midwest where onions are grown. They will land on flat surfaces holding their wings like oars to display the charming patterns.

About jjneal

Jonathan Neal is a retired Associate Professor of Entomology at Purdue University and author of the textbook, Living With Insects (2010). This blog is a forum to communicate about the intersection of insects with people and policy. This is a personal blog. The opinions and materials posted here are those of the author and are in no way connected with those of my employer.
This entry was posted in by jjneal, Environment. Bookmark the permalink.

1 Response to Picture on the Wing

  1. Pingback: Picture on the Wing – Entomo Planet

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