Bug FAQDruon quercuslanigerum
Druon quercuslanigerum · Order: Hymenoptera · Family: Cynipidae
The asexual females are reddish-brown and 2 to 2.5 mm long; sexual females are darker and 1.4 to 2.1 mm, while males are 1.2 to 1.6 mm. Galls appear as woolly, creamy-white to yellowish capsules on the underside of leaf mid-veins, and as similar galls on spring catkins.
Source: Wikipedia
How to recognize it
The leaf galls have a woolly outer layer that turns creamy-white to yellowish as they age, covering a light-brown inner capsule.
Source: Wikipedia
Size
Asexual females are 2 to 2.5 mm long and reddish-brown. Sexual females are 1.4 to 2.1 mm long, dark red-brown to black. Sexual males are 1.2 to 1.6 mm long and similar in colour to females.
Source: Wikipedia
Where it lives
They occur in the southern United States and Mexico. Asexual galls form on leaf undersides, while sexual galls form on catkins.
Source: Wikipedia
What it eats
Asexual generation larvae develop inside leaf galls. Sexual generation larvae develop inside catkin galls in spring.
Source: Wikipedia
Life cycle
The species has both asexual and sexual generations. Asexual adults emerge about ten times longer after emergence than sexual adults.
Source: Wikipedia
Where it comes from
Their range includes the southern United States and Mexico.
Source: Wikipedia
Lookalikes
Green parakeets prey on this gall wasp.
Source: Wikipedia
Where it is found in the US
Recorded in 15 of 51 states and DC. Most records: Texas, California, Louisiana, Florida, Virginia, Alabama, North Carolina, South Carolina.
Darker = more records. Counts are museum and citizen-science records, not population size.
Source: GBIF
Months it is reported in the US
Source: GBIF
More photos
Questions people ask
What do the galls look like?
They are woolly, creamy-white to yellowish capsules on leaf undersides with a light-brown interior.
Source: Wikipedia
Where can I find this wasp?
In the southern United States and Mexico, on oak leaves and catkins.
Source: Wikipedia
Same family (Cynipidae)
Sources
- Wikipedia: https://en.wikipedia.org/wiki/Druon_quercuslanigerum
Look it up elsewhere: GBIF · iNaturalist · BugGuide · Wikipedia
Text written 2026-10-22 from the sources above and checked sentence by sentence against them. Data fetched 2026-10-22.