Bug FAQSmall Oak Apple Gall Wasp
Amphibolips quercusostensackenii · Order: Hymenoptera · Family: Cynipidae
The galls are about 7 to 9 mm across and hold a central cell for pupation. Galls form in spring and adults emerge in early to mid-July in the Chicago area.
Source: Wikipedia
How to recognize it
It belongs to the gall-wasp family Cynipidae.
Source: Wikipedia
Size
Each gall measures roughly 7 to 9 mm in diameter.
Source: Wikipedia
Where it lives
It occurs throughout eastern North America.
Source: Wikipedia
Life cycle
Galls develop in spring, and the adult wasps emerge from them between 8 and 15 July in Chicago.
Source: Wikipedia
When you see it
Adult emergence is recorded in early to mid-July.
Source: Wikipedia
Where it comes from
Its range covers eastern North America.
Source: Wikipedia
Where it is found in the US
Recorded in 3 of 51 states and DC. Most records: Connecticut, Illinois, Michigan.
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
More photos
Same family (Cynipidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Amphibolips_quercusostensackenii
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-24 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-24.