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Species Diastrophus nebulosus - Blackberry Knot Gall Wasp

StrangePod - Diastrophus nebulosus Raspberry? gall and larvae - Diastrophus nebulosus Diastrophus nebulosus gall - Diastrophus nebulosus Diastrophus nebulosus - female Lake Crabtree stem gall on Rubus pensilvanicus D_G65 2018 1 - Diastrophus nebulosus Diastrophus nebulosus? - Diastrophus nebulosus blackberry gall - Diastrophus nebulosus Blackberry Knot Gall - Diastrophus nebulosus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Parasitica" - Parasitoid Wasps)
Superfamily Cynipoidea
Family Cynipidae (Gall Wasps)
Tribe Diastrophini (Herb and Herb Inquiline Gall Wasps)
Genus Diastrophus
Species nebulosus (Blackberry Knot Gall Wasp)
Other Common Names
Blackberry Gall Maker
Synonyms and other taxonomic changes
Cynips nebulosus Osten Sacken 1861
Induces galls in blackberry stems: "Rounded or long stem swellings, sometimes with 4 or 5 deep longitudinal furrows, length 2 to 6 inches." (1)

Parasitoids include this eurytomid:
See Also
Several other Diastrophus species induce galls in blackberry stems, but the longitudinal furrows are apparently characteristic of this species.
Works Cited
1.Plant Galls and Gall Makers
Ephraim Porter Felt. 1940. Comstock Publishing Company, Inc., Ithaca NY.