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Plant-parasitic hemipteran colony

Plant-parasitic hemipteran colony
Pickle Springs Natural Area, Ste. Genevieve County, Missouri, USA
December 28, 2007
Size: Colony length ~4in
I found this colony of plant-parasitic hemipteran insects on a small branch of a small hop hornbeam tree (Ostrya virginiana). As insects of this type go, the individuals are rather big. There was another colony on another branch in the same tree and some isolated scale insects above that colony. I didn't see any other colonies on any other trees in the area.

Moved from unidentified woolly aphids. Safe to call these Eriosomatinae (which does still exist, after all); take a look at the guide page to see what other woolly aphids look like.

I've moved it to here from Plant-parasitic Hemipterans.

Thanks for your feedback.

Probably in the genus Adelges.

Aren't adelgids...
all on conifers? I would think these must be some kind of woolly aphid.

I believe you're right...
...the true woolly aphids are genus Eriosoma in the Aphididae?

Probably not Eriosoma
I believe all the Eriosoma species spend part of the year on elms and the other part on various rosaceous trees. There are a number of other genera of woolly aphids, which used to be Eriosomatidae or Eriosomatinae, but that subfamily seems not to exist anymore (maybe paraphyletic?). They're all considered Aphididae at this point though. I've made a page here for unidentified woolly aphids. I would think yours could be identified once someone comes along with a catalog of aphid host plants... They certainly look similar to the woolly alder aphids and beech blight aphids, which are found on species in the Fagales, which includes hophornbeam.

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