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larose forest photos | all galleries >> INSECTS (INSECTA) (28 Galleries) >> Insect Galls >> Galls on Leaves > Willow gall caused by a sawfly
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29-JUL-2012 Christine Hanrahan

Willow gall caused by a sawfly

Found on a willow tree along the K&P Trail, west of Ottawa.

I had no idea what caused this particular gall, which is quite striking, but thanks to a comment left by a guest on another photo, 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 SX20 IS
1/640s f/4.0 at 5.0mm iso80 hide exif
Full EXIF Info
Date/Time29-Jul-2012 15:58:42
MakeCanon
ModelCanon PowerShot SX20 IS
Flash UsedNo
Focal Length5 mm
Exposure Time1/625 sec
Aperturef/4
ISO Equivalent80
Exposure Bias
White Balance
Metering Mode
JPEG Quality
Exposure Program
Focus Distance0.130 m

other sizes: small medium large original auto
J. Scott Coile27-Feb-2013 15:00
It is a very colorful gall.
Tom LeRoy27-Feb-2013 14:45
A great detailed shot of the gall. I thought it was a fruit too!V!
Industrial Heritage27-Feb-2013 13:46
Perfect photo to show how it is integrated in the leaf.
Graeme27-Feb-2013 10:00
Another one of your beautiful finds, Christine.BV
Yvonne27-Feb-2013 09:47
Very attractive gall, wonderful colour Christine! v
Sheila27-Feb-2013 09:02
Poor tree. Although the gall itself is quite attractive.
borisalex27-Feb-2013 05:50
...amazing nature! V.
joseantonio27-Feb-2013 05:23
Lovely light and sharp colors.V.
Carol Rollins27-Feb-2013 04:19
Excellent find and great close-up shot. Thanks for the info too.
globalgadabout27-Feb-2013 03:55
it's a marvel how various lifeforms interact..
Hank Vander Velde27-Feb-2013 00:37
Great image and info Christine.
Helen Betts26-Feb-2013 23:50
I thought from the thumbnail it was a piece of fruit ;-). Detail is excellent, as is the light in this vibrant image. V.
Guest 26-Feb-2013 23:21
Always learn so much here. Never knew of a gall.
SRW26-Feb-2013 23:09
Nice find... -- like Bill, I come here to be educated as much as I am entertained...!
bill friedlander26-Feb-2013 22:27
Good closeup of the gall! Learn something every day.
Karen Stuebing26-Feb-2013 22:27
It looks like it's eaten the leaf. Great shine and color. It's actually pretty. V.
Terry Sprague26-Feb-2013 22:14
Cool!
Jim Coffman26-Feb-2013 22:12
Nice find and well captured!
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