Bug FAQBlackberry Knot Gall Wasp
Diastrophus nebulosus · Order: Hymenoptera · Family: Cynipidae
No source yet on danger. We have no source yet on whether it bites, stings or damages anything.
The insect is called the blackberry knot gall wasp. It lives on the plant known as Rubus flagellaris.
Source: Wikipedia
Where it lives
Its host plant is Rubus flagellaris.
Source: Wikipedia
Where it is found in the US
Recorded in 45 of 51 states and DC. Most records: Washington, California, Virginia, Minnesota, Oregon, Maryland, North Carolina, Pennsylvania.
AKMEVTNHWAIDMTNDMNILWIMINYRIMAORNVWYSDIAINOHPANJCTCAUTCONEMOKYWVVAMDDEAZNMKSARTNNCSCDCOKLAMSALGAHITXFL
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Status: native in North America; native in United States. Source: iNaturalist
Months it is reported in the US
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Source: GBIF
More photos
Same family (Cynipidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Diastrophus_nebulosus
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-23 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.