Willow gall caused by a sawfly by larose forest photos

larose forest photos | all galleries >> INSECTS (INSECTA) (28 Galleries) >> Insect Galls >> Galls on Leaves > Willow gall caused by a sawfly

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26-JUN-2010	Christine Hanrahan

Willow gall caused by a sawfly

Found on a willow tree on a hiking trail in the west end of the city. I had no idea what caused this particular gall, which is quite striking, but now, thanks to a comment left by a guest, I know that this gall is caused by a Pontania sawfly species. Bug Guide has some good shots of the variations:
http://bugguide.net/node/view/185042

Canon PowerShot SX10 IS
1/640s f/3.2 at 5.0mm iso100 hide exif

Full EXIF Info
Date/Time	26-Jun-2010 14:09:26
Make	Canon
Model	Canon PowerShot SX10 IS
Flash Used	No
Focal Length	5 mm
Exposure Time	1/640 sec
Aperture	f/3.2
ISO Equivalent	100
Exposure Bias
White Balance
Metering Mode	matrix (5)
JPEG Quality
Exposure Program
Focus Distance

other sizes: small medium large original auto

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Guest		14-Jul-2012 17:21
Most likely a Pontania sp. of sawfly.

Graeme		19-Apr-2011 10:13
Very nice close up Chirstine. Vote

Hank Vander Velde		19-Apr-2011 03:18
Neat find , image and info Christine.

Carl Carbone		19-Apr-2011 01:57
Those bugs sure have a lot of gall! :-)

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