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Leaf gall on Arroyo Willow (Salix lasiolepis) - Iteomyia

Leaf gall on Arroyo Willow (Salix lasiolepis) - Iteomyia
Carpinteria Salt Marsh, Santa Barbara County, California, USA
April 10, 2010
Size: 7mm diam.
There were some galls on the underside of the leaves of an Arroyo Willow tree (Salix lasiolepis) that I saw today. I'd previously photographed galls of a similar size and color in the leaves of the same tree species near this location that were ID'd as Pontania, but these galls are somewhat different in their shape, with that sort of vertical elongation and the circular "crater" thing at the tip.

Anyway, I'm curious if the gall experts have any ideas. Thanks.

Moved from Unidentified Galls.

Iteomyia sp?
Ron Russo's book (1) describes a very similar gall induced by the Willow Tube Gall Midge (Iteomyia sp.) - "This midge induces round-tubular monothalamous galls that hang from the bottom of Arroyo Willow leaves. The distinguishing character of these midge galls is the apical hole or depression that develops at the end of each gall. While most of the gall hangs below the leaf, there is usually a slight depression on the dorsal surface".

If you're interested in galls, this book will have descriptions and images of many of the galls you encounter.

Moved from ID Request.

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