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Photo#738225
Gall? - Rhopalomyia undescribed-species-on-amorpha

Gall? - Rhopalomyia undescribed-species-on-amorpha
String Lake Waterfowl Production Area, Jackson County, Minnesota, USA
June 28, 2012
Probably ~1/4 inch. On Lead Plant (Amorpha canescens). Any information appreciated - I think I saw this on lead plant in a few areas. On dry hill prairie.

Moved
Moved from Rhopalomyia.

Moved
Moved from ID Request.

Rhopalomyia sp.
These are caused by an undescribed species of gall midge--apparently no specimens of the gallmaker exist(1). If you find these again, Dr. Gagne would probably be interested in examining them and the larvae within.

 
Sorry,
I forgot about the potential desire to see specimens. I have seen these galls in at least three locations in at least two Minnesota counties (Jackson and LeSueur) in the past two years (July and August as I recall). If someone wants specimens, please let me know. I should be able to secure specimens next year.

 
I see these Leadplant conical galls
on most prairie remnants in Iowa but have yet to see them on a prairie planting.

I do wish someone could rear an adult. I have never been able to rear an adult fly, no matter when I collect the galls, although have gotten an occasional parasitoid but am not sure if it was from the same type of gall (see for gall question).

 
Lead Plant galls
I just noticed that I did see these galls in a restoration this July. However, it is a reasonably small restoration with a high density of lead plant which is a adjacent to remnant prairie in Joseph A. Tauer Prairie SNA. Also present were Walshia amorphella galls and - all on planted lead plant. I have yet to see them on a stand-alone restoration.

 
Two things:
Thanks for the info that you've found both the galls and W. amorphella in a prairie planting.

Also, would certainly welcome you trying to rear the lep larva. I've tried several times with a successful rearing to adult (moth) only once

Third thing: have you found these on Lead plant in a planting?

OK, fourth: how about these ?

 
MJ,
Thank you for providing me with information through the work you put on BugGuide.

Many of these insects are somewhat of a tangent for me, not my principle focus so I do very little rearing. I also do most of my observation on sites where I need permits to collect - some places I have permits for some species, most of my collections come from my limited time on private property.

Regarding the Amorphicola pallida. I am not sure I have seen that species anywhere; however, I suspect I would easily over look it. I am amazed how many times I am going through plant photos and there are insects or spiders of that size that I did not notice in the field. I generally do not pursue them as I have limited photos, but I do not recall seeing that species or anything like it on lead plant.

More interesting to me is item #4. I do not recall seeing anything similar in a restoration, but it doesn't mean I haven't. Sometimes I do not realize I am in a small restoration in a larger remnant complex. I have collected something similar from a dry hill prairie in Yellow Medicine County, MN. I have pressed specimens of the leaves and a preserved larva in EtOH which I hope to send to Ray Gagne as soon as I get through my photos and permit reports. I was not aware that you had previously encountered that species [group?]. I will send you some images and additional information by email.

 
I have similar experience
I also raised a parasitoid from the galls this year, but so far no luck with midges. I collected these galls from several locations as far northwest as western Yellow Medicine County this year (about as far NW as I have searched), but I lost most material due to mold issues before anything emerged. I also have not noticed these galls on "restored prairie", but I do not spend much time on restored prairie. I also really wondered if the two gall shapes were different species, but minimally they do seem to co-occur. I also found similar galls (the conical form) on flowers this year in at least two counties (I fear I may have deleted the photos, but I have a specimen).

 
Keep trying for an adult fly!
I've been rearing for years and still fail more than I succeed. I find there is a fine line between desiccation and rot and I have yet to master it.

 
Yes
As far as I know, nothing further has been learned about this species, and there are still no specimens of larvae or adults.

 
Thank you
Thank you very much for the information. That is very interesting. I will see what I can do - I will be looking for them next year.

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