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Oak Grove Nature Center

Galls found in Oak Grove Regional Park

Below you will find images of a small selection of the galls that can be found on the oaks and other plants located in Oak Grove Regional Park. Click on the image to see a larger image.

.cal gall forming  cal gall maturing  Mature cal gall

California Gall Wasp gall (Andricus quercuscalifornicus), also known as Oak Apples, forming, maturing and mature, ready for wasps to "hatch".

cal jump gall  club gall  clustered gall

From left to right: California Jumping Gall Wasp gall (Neuroterus saltatorius); Club Gall Wasp gall (Xanthoteras clavuloides); Clustered Gall Wasp gall (Andricus brunneus).

convoluted gall  disc gall  redcone gall

From left to right: Convoluted Gall Wasp gall (Andricus confertus); Disc Gall Wasp galls(Andricus parmula) on Blue Oak; Red Cone Gall Wasp galls (Andricus kingi).

blister gall  spiny leaf gall  willow apple galls

From left to right: Rose Blister Gall Wasp galls (Diplolepis rosaefolii); Spiny Leaf Gall Wasp gall (Diplolepis polita) on California Rose; Willow Apple Gall Sawfly galls (Pontania clifornica) on Arroyo Willow.