Andricus chrysobalani Weld.

Quercus chrysolepis
Acorn galls
Fig 51. Cell under young acorn in midsummer.

51. chrysolepis • Acorns of the current season collected Aug. 14 gave adults Aug. 10–28 (Kyburz). Affected acorns are apt to be lop-sided or undersized.

Andricus chrysobalani, new species

Consists of a larval cell horizontally placed inside of and in very base of young acorns in midsummer. Affected acorns are those of the current season whose growth has been so retarded that they are undersized (10-18 mm.), often lopsided, with the cup more or less distorted. The cotyledons do not develop inside. The exit hole is in the top of the acorn and the cup is not involved.

Andricus chrysobalani
(Callirhytis chrysobalani)*
Acorn-gall wasp

Hosts: Quercus chrysolepis

The monothalamous, early summer, acorn galls of this wasp occur on canyon live oak. The larval actions of this wasp stop the development of the acorn at a young stage, leaving it lopsided, undersize, and barely protruding beyond the cup.