Round Honeydew Gall Wasp

Cynipidae

Disholcaspis

Quercus berberidifolia

California

Quercus douglasii

Quercus dumosa

Quercus durata

Disholcaspis canescens (agamic)

Holcaspis canescens Bassett

Gall. In clusters on the branch of a species of dwarf oak (Quercus sp.) Rounded, hard, and woody, with a blunt spur at the apex. Resembling dwarf specimens of Holcaspis duricoria, though the surface is more hoary. Internally, there is a single larval cell, attached to the gall, but can be detached without breaking; around the cell there is a thin layer of rusty brown, and outside this a light gray color prevails. Diameter 10 mm. 

Habitat. California. 

The type is in the American Entomological Society.

The species of Holcaspis and their galls

Disholcaspis canescens 

Quercus douglasii, dumosa, durata
Stem galls, detachable from the twig
Globular bullet, dia. 10 mm., single, surface slightly tuberculate with mealy bloom when fresh. Adults in Feb.




Cynipid Galls of the Pacific Slope

Disholcaspis canescens
[Page 100]

This cynipid wasp induces densely hairy, monothalamous, detachable, round, silvery, slightly mottled bud galls on blue and scrub oaks. The silvery-gray bloom that covers the galls rubs off easily. 

Hosts:
Quercus douglasii
Quercus berberidifolia

Plant Galls of the Western United States