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Ruptured Twig Gall Wasp

Callirhytis perdens


Bulbous growth in stem. It appears that whatever was in there has broken out. The end of the plant was dead beyond the gall.


Oak forest at Blue Sky Ecological Reserve


"Larvae cause tapered stem galls on black oaks (Quercus kelloggi, Q. agrifolia, and Q. wislizenii). As the larvae develop, the stem ruptures and eventually expels the larval capsules onto the ground. The linear fissures remaining on the stem become black, which distinguishes them from other black oak stem galls."

1 Species ID Suggestions

orbea 7 years ago
Ruptured Twig Gall Wasp
Callirhytis perdens Joyce Gross: Images

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I believe it is Coast Live Oak; however, I can't be certain as it was a long time ago :)

orbea 7 years ago

Which species of oak?

San Diego, California, USA

Spotted on Mar 6, 2012
Submitted on Mar 6, 2012

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