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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Flies (Diptera) » "Nematocera" (Non-Brachycera) » Gnats, Gall Midges, and March Flies (Bibionomorpha) » Fungus Gnats and Gall Midges (Sciaroidea) » Gall Midges and Wood Midges (Cecidomyiidae) » Gall Midges (Cecidomyiinae) » Cecidomyiidi » Macrodiplosis » Macrodiplosis majalis
Photo#447056
gall on underside of oak - Macrodiplosis majalis
Copyright © 2010 Sara Rall

gall on underside of oak - Macrodiplosis majalis
Milford, Hillsborough County, New Hampshire, USA
August 21, 2010
round galls on underside of oak leaf

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gall on underside of oak - Macrodiplosis majalis gall on underside of oak - Macrodiplosis majalis
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Contributed by Sara Rall on 25 August, 2010 - 10:29pm
Last updated 17 December, 2010 - 9:56pm

Moved
Moved from Unidentified Galls.
Pin oak is the host Gagne (1) lists for this gall, so that's a good sign.
… Charley Eiseman, 17 December, 2010 - 9:56pm login or register to post comments

Oak species
Galls can be very host-specific, so knowing the species of oak could be quite helpful. From the limited view in this photo, it is evident that this tree is in the "red oak group" with pointed lobes and tufts of hair at the underside junction of veins. Its deeply cut sinus (extending more than halfway to the midvein, extended bristle tips, and horizontal upper lobe edge make me suspect Pin Oak (Quercus palustris), which is often planted as an ornamental tree in lawns. If you had a photo with a wider view of the leaf, it would make identifying the tree easier.
… John Pearson, 26 August, 2010 - 7:49pm login or register to post comments

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