Willow Apple Gall in Glen Canyon Park (2067805180)

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Description: Gall on Arroyo willow (Salix lasiolepis) This gall is induced by a sawfly (Pontania californica syn. Pontania pacifica). Glen Canyon Park San Francisco, CA _________________ Reference: Field Guide to PLANT GALLS of California and Other Western States by Ron Russo- ISBN 978-0-520-24886-1. Date: 26 November 2007, 19:07. Source: Willow Apple Gall in Glen Canyon Park. Author: Franco Folini from San Francisco, USA.