Bug FAQDisc Gall Wasp
Feron parmula · Order: Hymenoptera · Family: Cynipidae
The Disc Gall Wasp makes small, disc-shaped galls up to about 3 mm across that are pale with red streaks. These wasps induce galls on many oak species, especially white oaks, along the Pacific coast of Oregon and California.
Source: Wikipedia
How to recognize it
The galls are pale and show red streaking.
Source: Wikipedia
Size
Each gall is disc-shaped and can be up to 3 mm in diameter.
Source: Wikipedia
Where it lives
Galls have been found on the Pacific coast of North America, specifically in Oregon and California.
Source: Wikipedia
What it eats
It creates galls on a wide range of oak species, especially white oaks and their hybrids.
Source: Wikipedia
Life cycle
Adult females emerge in April.
Source: Wikipedia
When you see it
The emergence of adult females occurs in April.
Source: Wikipedia
Where it comes from
The wasp’s range includes Oregon and California on the Pacific coast.
Source: Wikipedia
Where it is found in the US
Recorded in 48 of 51 states and DC. Most records: California, Texas, Virginia, Oregon, Florida, Massachusetts, Illinois, Ohio.
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
Source: GBIF
More photos
Questions people ask
What trees do they affect?
They induce galls on many oak species, especially white oaks and hybrids.
Source: Wikipedia
Where are these wasps found?
They have been documented on the Pacific coast in Oregon and California.
Source: Wikipedia
Same family (Cynipidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Feron_parmula
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.