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Fungus or disease on an oak tree leaf
I found this on an oak tree leaf in California's Central Valley. Trying to identify what it is and what causes it.
Spotted on Aug 26, 2013
Submitted on Aug 26, 2013
2 Comments
Asexual generation galls of Andricus kingi on valley oak leaf, Fremont.
Thank you. That is exactly what they are. Interesting.
Most likely these are galls caused by an oak gall wasp from the family Cynipidae.
http://en.wikipedia.org/wiki/Gall_wasp
Compare them with this picture
http://tywkiwdbi.blogspot.com.au/2011/03...