[NatureNS] FW: photo of flat "red dot" galls on maple leaf, was Try this URL Jim

Date: Thu, 05 Jul 2007 19:37:06 -0300
From: Jim Wolford <jimwolford@eastlink.ca>
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Jeannie, thank you, and your site worked for me.  They look to me like
spangle galls, and now I have to look them up to be sure that they are
caused by eggs or larvae of gall midges (flies) rather than gall wasps.

After having done that in one book (Insects of Eastern Hardwood Trees, from
Can. Forstry Service, Environment Canada (1982)), it seems these "red dots"
may be galls from the MAPLE BLADDERGALL MITE, Vasates quadripedes (Shimer),
although some of the spots that are quite flat and yellowish might be from
the OCELLATE GALL MIDGE, Cecidomyia ocellaris (Osten Sacken).
Interestingly, for the latter gall midge, "By the time the gall is seen,
however, the tiny midge larva, which occupies a depression in the lower leaf
surface, has usually fallen to the ground."

I have another, larger and more recent, book that might provide more info',
and I will check that soon.

For those who don't know what galls are, they are sort of like benign
tumours, and are abnormal growths on plants caused by various sorts of
stimuli, mostly biological, from a great diversity of different kinds of
organisms, from viruses to bacteria, fungi, insects, mites, nematodes
(roundworms), etc., etc.

Cheers from Jim
----------
From: Jeannie <jeannies@ns.sympatico.ca>
Date: Thu, 05 Jul 2007 12:31:05 -0300
To: Jim Wolford <jimwolford@eastlink.ca>
Subject: Try this URL Jim

Or if you want I can send you the photo.
http://outdoors.webshots.com/photo/2462231240025930195Ddemqn
Jeannie Shermerhorn,Port Hawkesbury

Cottage....Cape George,Cape Breton


jeannies@ns.sympatico.ca

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