Galls of Hastings Oak Leaves

Photos by Jay McEntee and Andrew Tuccillo March 2005. Images reviewed for identification by Ron Russo and Kathy Schick, April 2005.

See: Russo, R. A. (1979) Plant Galls of the California Region. Boxwood Press, Pacific Grove, CA.

Species

Photos

Comments/Additional Photo

Size

Host

Andricus atrimentus

Left – Andricus atrimentus

(Right – Andricus gigas For additional information on A. gigas, see below.)

Approximately 4mm wide and 4 mm tall.

Typically found on Q. douglassii, rarely on Q. lobata.

Besbicus multipunctatus

  Most are brown with otherwise similar appearance.  Approximately 6 mm diameter. 

Found on Q. douglassii (as in photo, far left) and on Q. lobata.

Andricus confertus

Andricus confertus on valley oak

Andricus confertus are conglomerations, masses of separate individual galls.   Clusters are approximately 10-14mm diameter, though they can be much smaller.

Found on Q. lobata (rarely on Q. douglassii).

Andricus fullawayii

Approximately 5-8 mm diameter.

Found on Q. lobata (as in photos) and Q. douglassii.

Andricus gigas

Andricus gigas on blue oak

3-4 mm wide.

Found on Q. douglassii and Q. lobata.

Andricus kingi

5 mm tall, 3-5mm wide.

Found on Q. lobata.

Liodora pattersonae

Previously Andricus pattersonae

7-9 mm diameter.

Found on both Q. lobata and Q. douglassii.

Antron douglasii

Approximately 10 mm tall, 15 mm wide at widest point.

Found on both Q. lobata (as in photos) and Q. douglassii.

Antron douglasii (cont’d)

Antron quercusechinus

Previously

A. echinas

Up to 1cm diameter.

Found on both Q. douglassii (as in photos) and Q. lobata.

Antron quercusechinus

(cont’d)

Possible rare forms Antron echinas

Antron douglassii with

Lacewing eggs...

Note: The large, light purple gall in this photo is an Antron douglassii.  There are two lacewing eggs attached to it -the two white hair-like projections with club tips.

Approximately 2 cm long, and 2 mm wide at bulging tip.

Found on both Q. douglassii and Q. lobata.

Xanthoteras clavuloides

Xanthoteras clavuloides on valley oak.

7-8 mm tall, 2 mm wide.

Found on Q. lobata (shown; rarely on Q. douglassii).

Unknowns