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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » "Parasitica" - Parasitoid Wasps » Cynipoidea » Gall Wasps (Cynipidae) » Herb and Herb Inquiline Gall Wasps (Diastrophini) » Diastrophus » Blackberry Knot Gall Wasp (Diastrophus nebulosus)
Photo#1862926
blackberry gall - Diastrophus nebulosus
Copyright © 2020 Wendy Jegla

blackberry gall - Diastrophus nebulosus
Millcreek Township, Lebanon County, Pennsylvania, USA
July 25, 2020
Found this impressive gall on blackberry near our garden. I don't know exactly what species of Rubus - previous owners planted something commercial/thornless, and it has spread. Based on a picture in Charley Eiseman's Tracks & Signs, figured it must be a Diastrophus? Is it possible to snip a branch like this and move it somewhere else, or do the larvae need living plant tissue for development? If it can't be moved, I can try to protect it with chicken wire. I don't trust our chickens not to molest it.

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blackberry gall - Diastrophus nebulosus blackberry gall - Diastrophus nebulosus
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Contributed by Wendy Jegla on 25 July, 2020 - 12:12pm
Last updated 27 July, 2020 - 8:00pm

Moved
Moved from Unidentified Galls.

They do need living tissue; I'm not sure when the larvae will mature (I think adults won't emerge until next spring). I would think this gall is pretty chicken-resistant, but maybe not 100% chicken-proof!
… Charley Eiseman, 27 July, 2020 - 8:01pm login or register to post comments

Moved
Moved from ID Request.
… Wendy Jegla, 25 July, 2020 - 1:06pm login or register to post comments

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