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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Flies (Diptera) » "Acalyptratae" » Tephritoidea » Fruit Flies (Tephritidae) » Tephritinae » Dithrycini » Eurosta » Goldenrod Gall Fly (Eurosta solidaginis)
Photo#275933
From goldenrod round galls - Eurosta solidaginis
Copyright © 2009 Beatriz Moisset

From goldenrod round galls - Eurosta solidaginis
Horsham, Montgomery County, Pennsylvania, USA
March 10, 2009
Goldenrod round galls come in different sizes. Apparently the smaller ones get attacked by parasites more often than others; but the larger ones attract the hungry eye of chickadees in winter. So there are two opposite selective forces at work.
A goldenrod round gall has a rich fauna. In addition to several flies, some braconid wasps (subfamily Doryctinae) emerged from these galls, considerably smaller than the Eurosta flies, 2-3mm. Several females and one male, so far:
♀ ♂        A different one

I also found a mordellid beetle and larva


some Eulophids

and Eurytoma
E. gigantea larva E. gigantea ♀ E. gigantea ♂

More on Goldenrod Gall Fauna

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Fly from goldenrod galls. - Eurosta solidaginis - female From goldenrod round galls - Eurosta solidaginis
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Contributed by Beatriz Moisset on 16 May, 2009 - 12:50pm
Last updated 31 December, 2018 - 4:41pm

Moved
Moved from Braconid Wasps.
… Beatriz Moisset, 19 May, 2009 - 1:45pm login or register to post comments

Interesting observation
Is that from your own experience or have you read about it somewhere? I can think of a couple of possible explanations, but I wonder if you know what the real reason is.
… Charley Eiseman, 16 May, 2009 - 4:46pm login or register to post comments

 
References on info page
I got some of the info here and in other sites listed on the info page. Unfortunately the one published by the Minnesota State U. is not available right now. I wonder why.
In additon to these galls I have a couple of larger ones with the characteristic chickadee's damage if you are interested. I wasn't sure if it was right to submit them to Bugguide.
… Beatriz Moisset, 16 May, 2009 - 8:08pm login or register to post comments

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