Clustered Gall Wasp

British Columbia

Cynipidae

Andricus

Quercus berberidifolia

California

Quercus douglasii

Quercus dumosa

Quercus garryana

Oregon

Washington

Quercus lobata

Nevada

Cynipid Galls of the Pacific Slope

Andricus brunneus (agamic)

Andricus brunneus, n. sp.

Gall:
Thin-shelled, subglobular galls on leaves of Quercus douglasii, about the size of a pea, pointed at opposite poles.

Annals of the Entomological Society of America.Article: Monograph of the Gall-Making CynipidA (CynipinA) of California

Andricus brunneus

These galls are 3-5 mm. in diameter, in a cluster of 4 to 6 on the underside of the leaf. Tan, slightly mottled, slightly pubescent, thick-walled without any radiating fibers or free central cell, dropping in September. 

Host:
Quercus douglasii


New American Cynipid Wasps From Galls

Andricus brunneus

Quercus douglasii, dumosa, garryana, lobata
Leaf galls, detachable
Fig 124. On midrib, thick-walled. September.

Fig 102. Midrib cluster on Q. dumosa. Thought to be the same as Fig.124 on Quercus douglasii 

Fig 124. It is from these galls that adults have been reared that agree with the Fullaway types. His types were evidently associated with the wrong gall, namely one of Dros atrimentum (Kinsey) Fig. 98. From galls collected at Ukiah in October 1959 adults emerged Nov. 14, 1940. Fig. 102 of galls on Q-dumosa are thought to be this species • Brunneus occurs on Q-lobata and garryana also. 

Andricus brunneus

This cynipid wasp induces round, monothalamous, hairy galls on the ventral midrib of leaves of most white oaks along the Pacific Coast. Galls usually occur in clusters, although single specimens can be found. 



Plant Galls of the Western United States