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Photo#1848109
Sesiidae, stem swellings on Aspen, Dusky Clearwing - Paranthrene tabaniformis

Sesiidae, stem swellings on Aspen, Dusky Clearwing - Paranthrene tabaniformis
Hayden Prairie, Howard County, Iowa, USA
June 9, 2020
June 8, 2020: Larry Reis, WCCB Naturalist, led a small group of enthusiastic folks (Harmony Garden Club) on a meander through Hayden Prairie. There were insects and sign of insects to be seen. (oh yes, plants too.) The area where we spent the most time has a lot of Quaking Aspen, Populus tremuloides, and a lot of those Aspens had stem swellings. I cut a few (permit issued by Iowa DNR, Thank You) to see if something might emerge.

June 9, 2020: cut open a couple of stems to hollowed out areas and frass but nothing else.

Happy 4th of July: the container with the stems (and some Creeping Charlie galls, Liposthenes glechomae) had way too much moisture which needed to be wiped out. Opened the lid to find a wasp that just didn't look like the Creeping Charlie wasp. Also noted a spent pupa sticking out of an Aspen stem which looked like a lep pupa. (still didn't get what was going on) Taking photos of the wasp I realized that I had been duped, it was a Clearwing Moth. First I submitted a photo to Jim Durbin's Moth Identification Site then checked BG. It's the non-native Dusky Clearwing Moth which feed on Populus.

Question: is there any evidence that these larvae, in abundance, will impact the Aspens? Sure would be good.

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Sesiidae, stem swellings on Aspen, Dusky Clearwing - Paranthrene tabaniformis Sesiidae, stem swelling(s) on Aspen, Dusky Clearwing - Paranthrene tabaniformis Sesiidae, stem swelling(s) on Aspen, opened, Dusky Clearwing - Paranthrene tabaniformis Sesiidae, Dusky Clearwing, lateral - Paranthrene tabaniformis Sesiidae, Dusky Clearwing, frontal - Paranthrene tabaniformis Sesiidae, Dusky Clearwing, dorsal - Paranthrene tabaniformis Sesiidae, Dusky Clearwing, ventral - Paranthrene tabaniformis Sesiidae, Dusky Clearwing, spent pupa - Paranthrene tabaniformis